Articles de revues : « Novel Oxides - Magnetic Properties »

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Nnadozie, Ebenezer C., et Peter A. Ajibade. « Multifunctional Magnetic Oxide Nanoparticle (MNP) Core-Shell : Review of Synthesis, Structural Studies and Application for Wastewater Treatment ». Molecules 25, n^o 18 (9 septembre 2020) : 4110. http://dx.doi.org/10.3390/molecules25184110.

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The demand for water is predicted to increase significantly over the coming decades; thus, there is a need to develop an inclusive wastewater decontaminator for the effective management and conservation of water. Magnetic oxide nanocomposites have great potentials as global and novel remediators for wastewater treatment, with robust environmental and economic gains. Environment-responsive nanocomposites would offer wide flexibility to harvest and utilize massive untapped natural energy sources to drive a green economy in tandem with the United Nations Sustainable Development Goals. Recent attempts to engineer smart magnetic oxide nanocomposites for wastewater treatment has been reported by several researchers. However, the magnetic properties of superparamagnetic nanocomposite materials and their adsorption properties nexus as fundamental to the design of recyclable nanomaterials are desirable for industrial application. The potentials of facile magnetic recovery, ease of functionalization, reusability, solar responsiveness, biocompatibility and ergonomic design promote the application of magnetic oxide nanocomposites in wastewater treatment. The review makes a holistic attempt to explore magnetic oxide nanocomposites for wastewater treatment; futuristic smart magnetic oxides as an elixir to global water scarcity is expounded. Desirable adsorption parameters and properties of magnetic oxides nanocomposites are explored while considering their fate in biological and environmental media.

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Hernández-Velasco, J., R. Sáez-Puche, J. Rodríguez-Carvajal, E. García-Matres et J. L. Martínez. « Magnetic properties of novel R2BaCoO5 oxides (R = Pr, Nd, Ho) ». Journal of Alloys and Compounds 207-208 (juin 1994) : 257–62. http://dx.doi.org/10.1016/0925-8388(94)90216-x.

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Yamamoto, Tatsuhiro, Kenji Kamishima, Koichi Kakizaki et Nobuyuki Hiratsuka. « Preparation of novel potassium, lanthanum-iron oxides and their magnetic properties ». Transactions of the Materials Research Society of Japan 37, n^o 2 (2012) : 271–74. http://dx.doi.org/10.14723/tmrsj.37.271.

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Long, Nguyet Viet. « INVESTIGATION OF SURFACES OF NOVEL IRON OXIDES WITH GRAIN AND GRAIN BOUNDARY ». Vietnam Journal of Science and Technology 56, n^o 1A (4 mai 2018) : 226. http://dx.doi.org/10.15625/2525-2518/56/1a/12527.

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Hierarchical nano/microscale α-Fe2O3 iron oxide particle system was prepared by an improved and modified polyol method with the use of NaBH4 agent with high heat treatment at 900 °C in air. Here, α-Fe2O3 iron oxide particles with different shapes were analyzed. The morphologies of the surfaces of α-Fe2O3 iron oxide particles show the oxide structures with the different nano/microscale ranges of grain sizes. In this research, we have found that grain and grain boundary growth limits can be determined in α-Fe2O3 iron oxide structure. This leads to the possibility of producing new iron oxide structures with distribution of desirable size grain and grain boundary. With α-Fe2O3 structure obtained, the magnetic properties of the α-Fe2O3 iron oxide system are different from those of previously reported studies. in national and international studies.Keywords: Iron iron oxides, α-Fe2O3, chemical polyol methods, heat treatment.

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Venkatesan, T., D. C. Kundaliya, T. Wu et S. B. Ogale. « Novel approaches to field modulation of electronic and magnetic properties of oxides ». Philosophical Magazine Letters 87, n^o 3-4 (mars 2007) : 279–92. http://dx.doi.org/10.1080/09500830701250314.

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Du, Yongping, et Xiangang Wan. « The novel electronic and magnetic properties in 5d transition metal oxides system ». Computational Materials Science 112 (février 2016) : 416–27. http://dx.doi.org/10.1016/j.commatsci.2015.09.036.

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HERNANDEZ-VELASCO, J., R. SAEZ-PUCHE, J. RODRIGUEZ-CARVAJAL, E. GARCIA-MATRES et J. L. MARTINEZ. « ChemInform Abstract : Magnetic Properties of Novel Ln2BaCoO5 Oxides (Ln : Pr, Nd, Ho). » ChemInform 25, n^o 42 (18 août 2010) : no. http://dx.doi.org/10.1002/chin.199442018.

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Oprea, Madalina, et Denis Mihaela Panaitescu. « Nanocellulose Hybrids with Metal Oxides Nanoparticles for Biomedical Applications ». Molecules 25, n^o 18 (4 septembre 2020) : 4045. http://dx.doi.org/10.3390/molecules25184045.

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Cellulose is one of the most affordable, sustainable and renewable resources, and has attracted much attention especially in the form of nanocellulose. Bacterial cellulose, cellulose nanocrystals or nanofibers may serve as a polymer support to enhance the effectiveness of metal nanoparticles. The resultant hybrids are valuable materials for biomedical applications due to the novel optical, electronic, magnetic and antibacterial properties. In the present review, the preparation methods, properties and application of nanocellulose hybrids with different metal oxides nanoparticles such as zinc oxide, titanium dioxide, copper oxide, magnesium oxide or magnetite are thoroughly discussed. Nanocellulose-metal oxides antibacterial formulations are preferred to antibiotics due to the lack of microbial resistance, which is the main cause for the antibiotics failure to cure infections. Metal oxide nanoparticles may be separately synthesized and added to nanocellulose (ex situ processes) or they can be synthesized using nanocellulose as a template (in situ processes). In the latter case, the precursor is trapped inside the nanocellulose network and then reduced to the metal oxide. The influence of the synthesis methods and conditions on the thermal and mechanical properties, along with the bactericidal and cytotoxicity responses of nanocellulose-metal oxides hybrids were mainly analyzed in this review. The current status of research in the field and future perspectives were also signaled.

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Magro, Massimiliano, Davide Baratella, Emanuela Bonaiuto, Jessica de A. Roger et Fabio Vianello. « New Perspectives on Biomedical Applications of Iron Oxide Nanoparticles ». Current Medicinal Chemistry 25, n^o 4 (12 février 2018) : 540–55. http://dx.doi.org/10.2174/0929867324666170616102922.

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Iron oxide nanomaterials are considered promising tools for improved therapeutic efficacy and diagnostic applications in biomedicine. Accordingly, engineered iron oxide nanomaterials are increasingly proposed in biomedicine, and the interdisciplinary researches involving physics, chemistry, biology (nanotechnology) and medicine have led to exciting developments in the last decades. The progresses of the development of magnetic nanoparticles with tailored physico-chemical and surface properties produced a variety of clinically relevant applications, spanning from magnetic resonance imaging (MRI), drug delivery, magnetic hyperthermia, to in vitro diagnostics. Notwithstanding the wellknown conventional synthetic procedures and their wide use, along with recent advances in the synthetic methods open the door to new generations of naked iron oxide nanoparticles possessing peculiar surface chemistries, suitable for other competitive biomedical applications. New abilities to rationally manipulate iron oxides and their physical, chemical, and biological properties, allow the emersion of additional possibilities for designing novel nanomaterials for theranostic applications.

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Lorenz, Michael. « Pulsed laser deposition of functional oxides - towards a transparent electronics ». Acta Crystallographica Section A Foundations and Advances 70, a1 (5 août 2014) : C1412. http://dx.doi.org/10.1107/s2053273314085878.

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Metal oxides, in particular with transition metals, show strong electronic correlations which determine a huge variety of electronic properties, together with other functionalities. For example, ZnO and Ga2O3 as wide-bandgap semiconductors have a high application potential as transparent functional layers in future oxide electronics [1-2]. Other oxides of current interest are ferrimagnetic spinels of the type MFe2O4 (M=Zn,Co,Ni), see K. Brachwitz et al. Appl. Phys. Lett. 102, 172104 (2013), or highly correlated iridate films, see M. Jenderka et al. Phys. Rev. B 88, 045111 (2013). Furthermore, combinations of ferroelectric and magnetic oxides in multiferroic composites and multilayers show promising magnetoelectric coupling. For the exploratory growth of the above mentioned novel oxides into nm-thin films, pulsed laser deposition (PLD) appears as the method of choice because of its extremely high flexibility in terms of material and growth conditions, high growth rate and excellent structural properties [3]. This talk highlights recent developments of new functional oxides using unique large-area PLD processes running for more than two decades in the lab of the author [3].

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Tiittanen, Taneli, Sami Vasala et Maarit Karppinen. « Assessment of magnetic properties of A2B′B′′O6 double perovskites by multivariate data analysis techniques ». Chemical Communications 55, n^o 12 (2019) : 1722–25. http://dx.doi.org/10.1039/c8cc09579e.

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CHEN, H. S., E. M. GYORGY, L. C. KIMERLING, A. R. KORTAN et F. A. THIEL. « TRANSPORT PROPERTIES OF Tl–BASED SUPERCONDUCTORS PREPARED BY LIQUID-GAS-SOLIDIFICATION PROCESS ». Modern Physics Letters B 03, n^o 13 (10 septembre 1989) : 975–80. http://dx.doi.org/10.1142/s0217984989001515.

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Tl-based superconducting oxides have been fabricated by a novel liquid-gas solidification (LGS) process. The resultant oxides exhibit onset temperature of 120 K and zero-resistance above 113 K. Critical current densities J c obtained from dynamic hysteresis loops at a sweep rate 15.4 kOe/min and H a = 9 kOe are ~ 106 A/cm 2 at 10 K and ~ 5 × 104 A/cm 2 at 60 K. Appreciable time effects on magnetic hysteresis loops are seen at 77 K.

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Pandey, R. K., H. Stern, W. J. Geerts, P. Padmini, P. Kale, Jian Dou et R. Schad. « Room Temperature Magnetic-Semicondcutors in Modified Iron Titanates : Their Properties and Potential Microelectronic Devices ». Advances in Science and Technology 54 (septembre 2008) : 216–22. http://dx.doi.org/10.4028/www.scientific.net/ast.54.216.

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The phenomenal growths of information technology and related fields have warranted the development of new class of materials. Multifunctional oxides, magnetic-semiconductors, multiferroics and smart materials are just a few examples of such materials. They are needed for the development of novel technologies such as spintronics, magneto-electronics, radhard electronics, and advanced microelectronics. For these technologies, of particular interest are some solid solutions of ilmenite-hematite (IH) represented by (1-x) FeTiO3.xFe2O3 where x varies from 0 to 1; Mn-doped ilmenite (Mn+3-FeTiO3) and Mn-doped pseudobrookite, Mn+3-Fe2TiO5 (PsB). These multifunctional oxides are ferromagnetic with the magnetic Curie points well above the room temperature as well as wide bandgap semiconductors with band gap Eg > 2.5 eV. This paper outlines: (a) processing of device quality samples for structural, electrical and magnetic characterization, (b) fabrication and evaluation of an integrated structure for controlled magnetic switching, and (c) the response of the two terminal non-linear current-voltage (I-V) characteristics when biased by a dc voltage. Subsequently, we will identify a few microelectronic applications based on this class of oxides.

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Hernández-Velasco, J., et R. Sáez-Puche. « Synthesis, polymorphism and magnetic properties of novel Tb2BaMoO5 (MCo, or Ni) oxides ». Journal of Alloys and Compounds 225, n^o 1-2 (juillet 1995) : 147–51. http://dx.doi.org/10.1016/0925-8388(94)07094-6.

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OOMI, G., S. KAJI, Y. TOMIOKA et Y. TOKURA. « HIGH PRESSURE STUDY OF NOVEL ELECTRONIC PROPERTIES IN Sr2Fe(W1-xMox)O6 NEAR METAL-INSULATOR TRANSITION ». International Journal of Modern Physics B 21, n^o 18n19 (30 juillet 2007) : 3279–84. http://dx.doi.org/10.1142/s0217979207044378.

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Electrical resistivities of double perovskite oxides Sr 2 Fe ( W 1-x Mo x) O 6 have been measured at high pressure and high magnetic field to elucidate the transport properties of these materials. It is found that the main mechanism of the transport in the semiconducting phase is variable range hopping conduction and the insulating properties are suppressed by high pressure to show a crossover to metallic state. The magnetoresistances of these oxides are revealed to decrease at high pressure above 1 GPa. Extremely large Grüneisen parameters are found near x = 0.2, where the metal-insulator transition occurs. The origin for these properties will be briefly discussed in connection with the phase diagram.

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Burton, J. D., et E. Y. Tsymbal. « Magnetoelectric interfaces and spin transport ». Philosophical Transactions of the Royal Society A : Mathematical, Physical and Engineering Sciences 370, n^o 1977 (28 octobre 2012) : 4840–55. http://dx.doi.org/10.1098/rsta.2012.0205.

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Engineered heterostructures designed for electric control of magnetic properties, the so-called magnetoelectric interfaces , present a novel route towards using the spin degree of freedom in electronic devices. Here, we review how a subset of such interfaces, namely ferromagnet–ferroelectric heterostructures, display electronically mediated control of magnetism and, in particular, emphasis is placed on how these effects manifest themselves as detectable spin-dependent transport phenomena. Examples of these effects are given for a variety of material systems on the basis of ferroelectric oxides, manganese and ruthenium magnetic complex oxides and elemental ferromagnetic metals. Results from both theory and experiment are discussed.

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Chen, Aiping, Jia-Mian Hu, Ping Lu, Tiannan Yang, Wenrui Zhang, Leigang Li, Towfiq Ahmed et al. « Role of scaffold network in controlling strain and functionalities of nanocomposite films ». Science Advances 2, n^o 6 (juin 2016) : e1600245. http://dx.doi.org/10.1126/sciadv.1600245.

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Strain is a novel approach to manipulating functionalities in correlated complex oxides. However, significant epitaxial strain can only be achieved in ultrathin layers. We show that, under direct lattice matching framework, large and uniform vertical strain up to 2% can be achieved to significantly modify the magnetic anisotropy, magnetism, and magnetotransport properties in heteroepitaxial nanoscaffold films, over a few hundred nanometers in thickness. Comprehensive designing principles of large vertical strain have been proposed. Phase-field simulations not only reveal the strain distribution but also suggest that the ultimate strain is related to the vertical interfacial area and interfacial dislocation density. By changing the nanoscaffold density and dimension, the strain and the magnetic properties can be tuned. The established correlation among the vertical interface—strain—properties in nanoscaffold films can consequently be used to tune other functionalities in a broad range of complex oxide films far beyond critical thickness.

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GE, CHEN, KUI-JUAN JIN, HUI-BIN LU et CONG WANG. « NOVEL PROPERTIES IN OXIDE HETEROSTRUCTURES ». Modern Physics Letters B 23, n^o 09 (10 avril 2009) : 1129–45. http://dx.doi.org/10.1142/s0217984909019594.

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A brief review of recent investigations in oxide heterostructures is presented. First, experimental results are shown. Positive colossal magnetoresistance with high sensitivities are obtained at low magnetic field (<1000 Oe) nearly at room temperature. Picoseconds photoelectric effects of the rise time ~ 210 ps and the half-maximum ~ 650 ps are also found in some oxide heterostructures. Furthermore, resistance switching characteristic and electric displacement-voltage hysteresis loops have been observed in BaTiO 3-δ/ Si p–n heterostructures. Second, theoretical descriptions are also shown here. A model for the mechanism causing the positive colossal magnetoresistance has been established. Moreover, the transport properties and the important role played by oxygen vacancies are theoretically investigated in oxide heterostructures. In addition, an extended percolation model is well developed, with which the transport characteristic in oxide thin films can be well simulated based on the phase separation scenario. Notably, the interface effects play a crucial role in the multifunctional properties of the oxide heterostructures.

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Bayarmaa, B., E. Selenge et Yang Min. « Study on arsenic removal process from water ». Mongolian Journal of Chemistry 12 (24 septembre 2014) : 53–55. http://dx.doi.org/10.5564/mjc.v12i0.172.

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In this study a novel adsorbent, iron oxide, is used for As (V) or As (III) removal. Some ferric oxides have been reported to be effective for arsenic removal. Ferric oxides powder is a good adsorbent material since it’s has magnetic properties and a good adsorption capacity. The main purpose of this study has been focused on to study the relationship between adsorption capacity (ability, performance) and the surface characteristics of the ferric oxide. Prepared sample’s capacity was evaluated. The value was 26.1-67.4 mg/g for As (V) and 20.5-47.8 mg/g for As (III). pH dependence was evaluated and when pH increasing, adsorption capacity was decreased. The kinetic was evaluated and about 12 hours reached equilibrium and a capacity of 49 mg/g for As (V) and 42 mg/g for As(III) was gained. The kinetic constants for arsenic adsorption on the ferrihydrite adsorbent’s were fitted.DOI: http://dx.doi.org/10.5564/mjc.v12i0.172 Mongolian Journal of Chemistry Vol.12 2011: 53-55

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HERNANDEZ-VELASCO, J., et R. SAEZ-PUCHE. « ChemInform Abstract : Synthesis, Polymorphism and Magnetic Properties of Novel Tb2BaMO5 (M : Co, or Ni) Oxides. » ChemInform 26, n^o 48 (17 août 2010) : no. http://dx.doi.org/10.1002/chin.199548011.

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Shorikov, Alexey O., Sergey L. Skornyakov, Vladimir I. Anisimov, Sergey V. Streltsov et Alexander I. Poteryaev. « Influence of Molecular Orbitals on Magnetic Properties of FeO2Hx ». Molecules 25, n^o 9 (8 mai 2020) : 2211. http://dx.doi.org/10.3390/molecules25092211.

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Recent discoveries of various novel iron oxides and hydrides, which become stable at very high pressure and temperature, are extremely important for geoscience. In this paper, we report the results of an investigation on the electronic structure and magnetic properties of the hydride FeO 2 H x , using density functional theory plus dynamical mean-field theory (DFT+DMFT) calculations. An increase in the hydrogen concentration resulted in the destruction of dimeric oxygen pairs and, hence, a specific band structure of FeO 2 with strongly hybridized Fe- t 2 g -O- p z anti-bonding molecular orbitals, which led to a metallic state with the Fe ions at nearly 3+. Increasing the H concentration resulted in effective mass enhancement growth which indicated an increase in the magnetic moment localization. The calculated static momentum-resolved spin susceptibility demonstrated that an incommensurate antiferromagnetic (AFM) order was expected for FeO 2 , whereas strong ferromagnetic (FM) fluctuations were observed for FeO 2 H.

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Huang, Jijie, Weiwei Li, Hao Yang et Judith L. MacManus-Driscoll. « Tailoring physical functionalities of complex oxides by vertically aligned nanocomposite thin-film design ». MRS Bulletin 46, n^o 2 (février 2021) : 159–67. http://dx.doi.org/10.1557/s43577-021-00028-0.

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AbstractSelf-assembled nanocomposite thin films couple two materials into a single film, typically, in the form of vertically aligned nanopillars embedded in a matrix film. High-density vertical heterointerfaces provide a great platform for engineering new physical properties and novel multifunctionalities, as well as for nanoscale device integration. Tremendous research efforts have been devoted to developing different nanocomposite systems. In this article, we summarize recent progress on vertically aligned nanocomposite thin films for enhanced functionalities such as ferroelectricity, tunable magnetoresistance, multiferroicity, dielectricity, magnetic anisotropy, perpendicular exchange bias, novel electrical/ionic properties, interfacial conduction, and resistive switching. Using specific examples, we discuss how and why the fundamental physical properties can be significantly tuned/improved in vertically aligned nanocomposites. Finally, we propose future research directions to achieve further enhanced performance as well as practical devices.

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TERESITA, V. MARY, V. JESEENTHARANI, B. AVILA JOSEPHINE et S. ARUL ANTONY. « SYNTHESIS OF NOVEL NANOSTRUCTURED LANTHANUM COBALT FERRITE MIXED METAL OXIDES BY SOL–GEL ». International Journal of Nanoscience 12, n^o 01 (février 2013) : 1350007. http://dx.doi.org/10.1142/s0219581x13500075.

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Properties of nanoscale materials are very interesting and these are either comparable to or superior to those of bulk. These materials are interesting due to their exciting size dependent optical, electronic, magnetic, thermal, mechanical and chemical properties. Different mole ratios of nanostructured mixed metal oxides of LaCo x Fe 1-x O 3-δ (x = 0 to 1) were prepared by the sol–gel method by varying the mole ratios of iron and cobalt substrates. The compounds were sintered for 700°C in the tubular furnace for 8 h. The purity of the compounds was analyzed by TG-DTA. The compounds were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and scanning electron microscopy (SEM) studies were employed to study the structural phases, vibrational frequencies, surface morphology of the highest humidity sensing compounds.

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Rewatkar, Kishor G. « Magnetic Nanoparticles : Synthesis and Properties ». Solid State Phenomena 241 (octobre 2015) : 177–201. http://dx.doi.org/10.4028/www.scientific.net/ssp.241.177.

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The discovery of novel materials, processes, and phenomena at the nanoscale and the development of new experimental and theoretical techniques for research provide fresh opportunities for the development of innovative nanosystems and nanostructured materials. Nanomaterials with tailored unique properties have limitless possibilities in materials science. The most widely used synthesis routes for iron oxide nanoparticles are based on precipitation from solution. Most of the nanoparticles available to date have been prepared using chemical route. Physical processes have also been recently developed to produce high quality monodisperse and monocrystalline iron oxide nanoparticles. Magnetite has recently attracted attention because bulk Fe3O4has a high Curie temperature of 850 K and nearly full spin polarization at room temperature, and due to its wide range of applications in almost all branches of science and technology. Clearly, nanoscale magnetite offers potential for creation of novel technology in multiple fields of study. Opportunities for magnetite nanoparticles to be effectively incorporated into environmental contaminant removal and cell separation magnetically guided drug delivery, imaging of tissue and organs, magnetocytolysis, sealing agents (liquid O-rings), dampening and cooling mechanisms in loudspeakers, high gradient magnetic separation (HGMS) techniques and contrasting agents for magnetic resonance imaging (MRI). Advancement of synthesis and stabilization procedures towards production of uniformly sized, dispersed (potentially embedded) magnetite nanoparticles has clearly inspired creative imagination and application in various fields.

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Ohtomo, Akira, Suvankar Chakraverty, Hisanori Mashiko, Takayoshi Oshima et Masashi Kawasaki. « Spontaneous atomic ordering and magnetism in epitaxially stabilized double-perovskites ». MRS Proceedings 1454 (2012) : 3–13. http://dx.doi.org/10.1557/opl.2012.923.

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ABSTRACTWe report on the atomic ordering of B-site transition-metals and magnetic properties in double-perovskite oxides, La2CrFeO6 (LCFO) and La2VMnO6 (LVMO), which have never been reported to exist in ordered forms. These double-perovskite oxides are particularly interesting because of possible ferromagnetism (expected from the Kanamori-Goodenough rule for LCFO) and half-metallic antiferromagnetism (predicted for LVMO). Using pulsed-laser deposition technique with single solid-solution targets, we have prepared epitaxial films in ordered forms. Despite similar ionic characters of constituent transition-metals in each compound, the maximum B-site order attained was surprisingly high, ∼90% for LCFO and ∼80% for LVMO, suggesting a significant role of epitaxial stabilization in the spontaneous ordering process. Magnetization and valence state characterizations revealed that the magnetic ground state of both compounds was coincidently ferrimagnetic with saturation magnetization of ∼2μBper formula unit, unlike those predicted theoretically. In addition, they were found to be insulating with optical band-gaps of 1.6 eV and 0.9 eV for LCFO and LVMO, respectively. Our results present a wide opportunity to explore novel magnetic properties of binary transition-metal perovskites upon epitaxial stabilization of the ordered phase.

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Islam, M. S., J. Kurawaki, Y. Kusumoto, M. Abdulla-Al-Mamun et M. Z. Bin Mukhlish. « Hydrothermal Novel Synthesis of Neck-structured Hyperthermia-suitable Magnetic (Fe₃O₄, γ-Fe₂O₃ and α-Fe₂O₃) Nanoparticles ». Journal of Scientific Research 4, n^o 1 (24 décembre 2011) : 99. http://dx.doi.org/10.3329/jsr.v4i1.8727.

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Novel neck-structured Fe3O4, γ-Fe2O3 and α-Fe2O3 magnetic nanoparticles were successfully prepared by a modified hydrothermal method. Ferrous chloride tetrahydrate was solely used as a precursor for the novel nanomaterials. The X-ray diffractometric study revealed the purity of the nanomaterials thus synthesized. All of the products were characterized using a field-emission scanning electron microscope (FE-SEM) and a transmission electron microscope (TEM) for the particle size and morphology. Neck-structured particle morphology was observed for the first time in all of iron oxides with magnetic properties. The particle size observed was 50–60 nm. The synthesized nanomaterials showed excellent magnetization values when magnetic hysteresis loops were measured using a superconducting quantum interference device (SQUID). Moreover, the as-prepared magnetic nanoparticles suspensions showed significant temperature increments under an AC (alternating current) magnetic-field induction condition at room temperature which indicates the hyperthermia feasibility. Keywords: Magnetic materials; Neck-structured; Hyperthermia; Heat dissipation. © 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. doi: http://dx.doi.org/10.3329/jsr.v4i1.8727J. Sci. Res. 4 (1), 99-107 (2012)

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Shpanchenko, R. V., V. V. Chernaya, A. M. Abakumov, E. V. Antipov, J. Hadermann, G. Van Tendeloo, E. E. Kaul, C. Geibel, D. Sheptyakov et A. M. Balagurov. « Crystal Structure and Magnetic Properties of the Novel Oxide Pb2V5O12 ». Zeitschrift für anorganische und allgemeine Chemie 627, n^o 9 (septembre 2001) : 2143. http://dx.doi.org/10.1002/1521-3749(200109)627:9<2143 ::aid-zaac2143>3.0.co;2-r.

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Saber, Osama, Mostafa Osama, Nagih M. Shaalan, Aya Osama, Adil Alshoaibi et Doaa Osama. « Designing Novel Strategy to Produce Active Nanohybrids in Sunlight for Purification of Water Based on Inorganic Nanolayers, Magnetic Nanocomposites and Organic Species ». Molecules 27, n^o 12 (7 juin 2022) : 3673. http://dx.doi.org/10.3390/molecules27123673.

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Energy and water related problems have attracted strong attention from scientists across the world because of deficient energy and water pollution. Following this line, new strategy depended on preparing nanolayers of Al/Zn and magnetic nanoparticles of cobalt iron oxides nanocomposite in addition to long chains of hydrocarbons of stearic acid to be used as roofs, fillers and pillars; respectively, to design optical-active nanohybrids in sunlight for removing the colored pollutants from water in few minutes. By using long chains of hydrocarbons of stearic acid, X-ray diffraction (XRD) results and TEM images showed expansion of the interlayered spacing from 0.76 nm to 2.02 nm and insertion of magnetic nanoparticles among the nanolayers of Al/Zn. The optical properties and activities showed that the nanohybrid structure based on zinc oxide led to clear reduction of the band gap energy from 3.3 eV to 2.75 eV to be effective in sunlight. Photocatalytic degradation of the dye of acid green 1 confirmed the high activity of the prepared zinc oxide nanohybrids because of a complete removal of the dye after ten minutes in sunlight. Finally, this strategy was effective for producing photo-active nanohybrids for using renewable and non-polluting energy for purifying water.

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Yi, Di, Jian Liu, Shang-Lin Hsu, Lipeng Zhang, Yongseong Choi, Jong-Woo Kim, Zuhuang Chen et al. « Atomic-scale control of magnetic anisotropy via novel spin–orbit coupling effect in La2/3Sr1/3MnO3/SrIrO3 superlattices ». Proceedings of the National Academy of Sciences 113, n^o 23 (19 mai 2016) : 6397–402. http://dx.doi.org/10.1073/pnas.1524689113.

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Magnetic anisotropy (MA) is one of the most important material properties for modern spintronic devices. Conventional manipulation of the intrinsic MA, i.e., magnetocrystalline anisotropy (MCA), typically depends upon crystal symmetry. Extrinsic control over the MA is usually achieved by introducing shape anisotropy or exchange bias from another magnetically ordered material. Here we demonstrate a pathway to manipulate MA of 3d transition-metal oxides (TMOs) by digitally inserting nonmagnetic 5d TMOs with pronounced spin–orbit coupling (SOC). High-quality superlattices comprising ferromagnetic La2/3Sr1/3MnO3 (LSMO) and paramagnetic SrIrO3 (SIO) are synthesized with the precise control of thickness at the atomic scale. Magnetic easy-axis reorientation is observed by controlling the dimensionality of SIO, mediated through the emergence of a novel spin–orbit state within the nominally paramagnetic SIO.

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BORIN, DMITRY, et STEFAN ODENBACH. « RHEOLOGY OF NOVEL FERROFLUIDS ». International Journal of Modern Physics B 25, n^o 07 (20 mars 2011) : 963–69. http://dx.doi.org/10.1142/s0217979211058511.

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The progress in the synthesis of new magnetic nanoparticles and agglomerates stimulates the development of novel ferrofluids with enhanced rheological properties. In the current work ferrofluids based on Co-nanoplatelets and clustered iron oxide nanoparticles have been considered. Steady-shear experiments and yield stress measurements of these ferrofluids have been performed using rotational rheometry.

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Jin, C. Q. « Using Pressure Effects to Create New Emergent Materials by Design ». MRS Advances 2, n^o 48 (2017) : 2587–96. http://dx.doi.org/10.1557/adv.2017.495.

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ABSTRACTNew emergent materials of novel electromagnetic properties are discussed, based primarily on our recent works. The use of pressure effects in terms of self oxidization, inner compression and pure doping in discovering new emergent materials is highlighted. Materials addressed include (I) new correlated oxides such as high-Tc cuprate superconductors; (II) new intermetallic materials such as diluted magnetic semiconductors with independent spin & charge doping; the “111” type iron based superconducting systems; (III) compounds with strong spin orbit coupling, such as itinerant ferromagnetic ruthenates etc.

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Maurizi, Lionel, Usawadee Sakulkhu, Lindsey A. Crowe, Vanessa Mai Dao, Nicolas Leclaire, Jean-Paul Vallée et Heinrich Hofmann. « Syntheses of cross-linked polymeric superparamagnetic beads with tunable properties ». RSC Adv. 4, n^o 22 (2014) : 11142–46. http://dx.doi.org/10.1039/c3ra48004f.

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Saghayezhian, M., Summayya Kouser, Zhen Wang, Hangwen Guo, Rongying Jin, Jiandi Zhang, Yimei Zhu, Sokrates T. Pantelides et E. W. Plummer. « Atomic-scale determination of spontaneous magnetic reversal in oxide heterostructures ». Proceedings of the National Academy of Sciences 116, n^o 21 (8 mai 2019) : 10309–16. http://dx.doi.org/10.1073/pnas.1819570116.

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Interfaces between transition metal oxides are known to exhibit emerging electronic and magnetic properties. Here we report intriguing magnetic phenomena for La2/3Sr1/3MnO3 films on an SrTiO3 (001) substrate (LSMO/STO), where the interface governs the macroscopic properties of the entire monolithic thin film. The interface is characterized on the atomic level utilizing scanning transmission electron microscopy and electron energy loss spectroscopy (STEM-EELS), and density functional theory (DFT) is employed to elucidate the physics. STEM-EELS reveals mixed interfacial stoichiometry, subtle lattice distortions, and oxidation-state changes. Magnetic measurements combined with DFT calculations demonstrate that a unique form of antiferromagnetic exchange coupling appears at the interface, generating a novel exchange spring-type interaction that results in a remarkable spontaneous magnetic reversal of the entire ferromagnetic film, and an inverted magnetic hysteresis, persisting above room temperature. Formal oxidation states derived from electron spectroscopy data expose the fact that interfacial oxidation states are not consistent with nominal charge counting. The present work demonstrates the necessity of atomically resolved electron microscopy and spectroscopy for interface studies. Theory demonstrates that interfacial nonstoichiometry is an essential ingredient, responsible for the observed physical properties. The DFT-calculated electrostatic potential is flat in both the LSMO and STO sides (no internal electric field) for both Sr-rich and stoichiometric interfaces, while the DFT-calculated charge density reveals no charge transfer/accumulation at the interface, indicating that oxidation-state changes do not necessarily reflect charge transfer and that the concept of polar mismatch is not applicable in metal−insulator polar−nonpolar interfaces.

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Nagpal, D., V. Gajraj, A. Kumar, K. I. Gnanasekar et C. R. Mariappan. « Novel compositions of mesoporous spinel-type ternary metal oxides microspheres : Structural and electrical properties functionality ». Physica B : Condensed Matter 630 (avril 2022) : 413679. http://dx.doi.org/10.1016/j.physb.2022.413679.

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Latushka, S. I., D. V. Zheludkevich, E. V. Budemko, K. N. Nekludov, M. V. Silibin et D. V. Karpinsky. « Crystal Structure and Magnetic Properties of Bi1-yBa(Sr)Fe1-yTiyO3 Solid Solutions ». Journal of Material Science and Technology Research 10 (29 août 2023) : 82–85. http://dx.doi.org/10.31875/2410-4701.2023.10.08.

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Abstract: Usages of various chemical substitution schemes of the initial multiferroic BiFeO3 can significantly reduce known drawbacks specific for the functional oxides based of iron ions and thus foster a creation of novel magnetoelectric compounds perspective for various technological applications. In the present study the co-doped compounds of the system Bi1-y(Ba1- xSrx)yFe1-yTiyO3 (x = 0.0 – 1.0; y ≤ 0.4) synthesized using sol-gel technique were analyzed focusing on the crystal structure stability and the correlation between the structure and magnetic properties. The concentration driven evolution of the crystal structure as well as the unit cell parameters were investigated based on the X-ray diffraction data, the correlation between the crystal structure and the magnetic properties of the compounds has been studied by magnetometry techniques. The compounds Bi1-y(Ba1- xSrx)yFe1-yTiyO3 with x = 0; y = ≤ 0.2 are characterized by single-phase rhombohedral structure, and increase in the dopant concentration to y = 0.4 leads to the stabilization of the pseudocubic phase. An increase in the Sr content leads to the phase transition in the compounds to the single phase state with the cubic structure which is accompanied by an increase in the value of the remanent magnetization.

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Lei, Honghong, Peng Jiang, Bin Li, Yuncheng Zhou, Rui Zhang, Jianlei Kuang, Wenbin Cao et Wei Wang. « Novel S, N co-doped Ba2In2-Cr O5+y oxides : Synthesis and optical properties ». Ceramics International 45, n^o 14 (octobre 2019) : 17157–62. http://dx.doi.org/10.1016/j.ceramint.2019.05.270.

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Sarkar, T., G. Muscas, G. Barucca, F. Locardi, G. Varvaro, D. Peddis et R. Mathieu. « Tunable single-phase magnetic behavior in chemically synthesized AFeO3–MFe2O4 (A = Bi or La, M = Co or Ni) nanocomposites ». Nanoscale 10, n^o 48 (2018) : 22990–3000. http://dx.doi.org/10.1039/c8nr06922k.

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Maccaferri, Nicolò, Alessio Gabbani, Francesco Pineider, Terunori Kaihara, Tlek Tapani et Paolo Vavassori. « Magnetoplasmonics in confined geometries : Current challenges and future opportunities ». Applied Physics Letters 122, n^o 12 (20 mars 2023) : 120502. http://dx.doi.org/10.1063/5.0136941.

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Plasmonics represents a unique approach to confine and enhance electromagnetic radiation well below the diffraction limit, bringing a huge potential for novel applications, for instance, in energy harvesting, optoelectronics, and nanoscale biochemistry. To achieve novel functionalities, the combination of plasmonic properties with other material functions has become increasingly attractive. In this Perspective, we review the current state of the art, challenges, and future opportunities within the field of magnetoplasmonics in confined geometries, an emerging area aiming to merge magnetism and plasmonics to either control localized plasmons, confined electromagnetic-induced collective electronic excitations, using magnetic properties, or vice versa. We begin by highlighting the cornerstones of the history and principles of this research field. We then provide our vision of its future development by showcasing raising research directions in hybrid magnetoplasmonic systems to overcome radiation losses and novel materials for magnetoplasmonics, such as transparent conductive oxides and hyperbolic metamaterials. Finally, we provide an overview of recent developments in plasmon-driven magnetization dynamics, nanoscale opto-magnetism, and acousto-magnetoplasmonics. We conclude by giving our personal vision of the future of this thriving research field.

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Pelloquin, D., A. Wahl, A. C. Masset, A. Maignan, C. Michel et B. Raveau. « A Novel Mixed Valent Chromium-Layered Oxide with Peculiar Magnetic Properties : Sr4.5Cr2.5O9 ». Journal of Solid State Chemistry 154, n^o 2 (novembre 2000) : 375–83. http://dx.doi.org/10.1006/jssc.2000.8798.

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Shpanchenko, R. V., V. V. Chernaya, A. M. Abakumov, E. V. Antipov, J. Hadermann, G. Van Tendeloo, E. E. Kaul, C. Geibel, D. Sheptyakov et A. M. Balagurov. « ChemInform Abstract : Crystal Structure and Magnetic Properties of the Novel Oxide Pb2V5O12. » ChemInform 32, n^o 48 (23 mai 2010) : no. http://dx.doi.org/10.1002/chin.200148010.

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Gao, Yu, Wenrui Du, Ajuan Yu, Xinglin Li, Wuduo Zhao et Shusheng Zhang. « Engineering a MOF–magnetic graphene oxide nanocomposite for enantioselective capture ». Analytical Methods 10, n^o 48 (2018) : 5811–16. http://dx.doi.org/10.1039/c8ay01876f.

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A novel magnetic graphene oxide–metal organic framework [Zn₂(BTC)(NO₃)(DMA)₃]_n (MGO–ZnBND) possessing both magnetic properties and excellent enantioselective capture of chiral drug intermediates was prepared and characterized in this paper.

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Lao, Xun, Xiao Yan, Jiao Xie et Ya Li Li. « Fabrication of Iron Carbide and Nitride Ceramics with Controlled Magnetic Properties by the Non-Oxide Sol-Gel Process ». Key Engineering Materials 512-515 (juin 2012) : 1429–33. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.1429.

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The carbodiimide-based non-oxide sol-gel process is a novel route to non-oxide nitride and carbide ceramics. This process has been applied to fabricate ternary or binary silicon based nitride and carbide ceramics. Based on this non-oxide sol-gel process, iron carbide and nitride have been fabricated by reaction of iron trichloride with bis(trimethylsilyl)carbodiimide to form FeCN gel followed by pyrolysis in argon flow at different temperatures. The iron carbide material obtained at 700 °C exhibits hard ferromagnetic properties whereas α-iron along with iron nitride formed at 1300 °C shows soft ferromagnetic properties. Therefore, iron carbide and nitride ceramics with controlled magnetic properties can be obtained along this novel non-oxygen sol-gel process by controlled pyrolysis. The pyrolysis behavior was investigated based on thermal gravimetric analysis coupled with differential scanning calorimetry. The phase structures of the iron carbide and nitride are identified by X-ray diffraction and the magnetic properties of the materials are measured by magnetometer.

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Hong, Woong-Ki, SeungNam Cha, Jung Inn Sohn et Jong Min Kim. « Metal-Insulator Phase Transition in Quasi-One-Dimensional VO2Structures ». Journal of Nanomaterials 2015 (2015) : 1–15. http://dx.doi.org/10.1155/2015/538954.

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The metal-insulator transition (MIT) in strongly correlated oxides has attracted considerable attention from both theoretical and experimental researchers. Among the strongly correlated oxides, vanadium dioxide (VO2) has been extensively studied in the last decade because of a sharp, reversible change in its optical, electrical, and magnetic properties at approximately 341 K, which would be possible and promising to develop functional devices with advanced technology by utilizing MITs. However, taking the step towards successful commercialization requires the comprehensive understanding of MIT mechanisms, enabling us to manipulate the nature of transitions. In this regard, recently, quasi-one-dimensional (quasi-1D) VO2structures have been intensively investigated due to their attractive geometry and unique physical properties to observe new aspects of transitions compared with their bulk counterparts. Thus, in this review, we will address recent research progress in the development of various approaches for the modification of MITs in quasi-1D VO2structures. Furthermore, we will review recent studies on realizing novel functional devices based on quasi-1D VO2structures for a wide range of applications, such as a gas sensor, a flexible strain sensor, an electrical switch, a thermal memory, and a nonvolatile electrical memory with multiple resistance.

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GOPAL, K. VARUN, P. K. KRISHNAN NAMBOORI, P. PREMKUMAR, DEEPA GOPAKUMAR et B. SABARISH NARAYANAN. « INSILICO MODELING AND SIMULATION OF MAGNETIC NANOPARTICLES FOR THE BIOLOGICAL CELL ISOLATION TECHNIQUE ». International Journal of Nanoscience 10, n^o 01n02 (février 2011) : 323–27. http://dx.doi.org/10.1142/s0219581x11008022.

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Magnetic nanoparticles (MNPs) can be used in a wide variety of biomedical applications like contrast agents for magnetic resonance imaging, magnetic labeling, controlled drug release, hyperthermia, and in cell isolation. Most of these applications need distinct and controllable interactions between the MNPs and living cells and can be made possible by a proper functionalization technique. This paper describes a computational approach for the identification of magnetic nanoparticles for the development, design, and demonstration of a novel, incorporated system for selective and rapid removal of biological, chemical, and radioactive biohazards from human body. The attraction between an external magnetic field and the MNPs facilitate separation of a wide variety of biological materials. This principle can be used for the isolation and aggregation of wandering cancer cells from the blood or the bone marrow to make a proper and early diagnosis of leukemia. Similarly, toxins, kidney stones, and other unwanted particles in the human body can be easily diagnosed and removed by the same technique. Nanoparticle-sized iron oxides have been studied in this work by computational modeling and molecular dynamic (MD) simulation techniques. Structural, thermodynamic, and magnetic properties have been formulated. In this work, nanoparticles of size varying from 0.5 to 2.5 nm have been analyzed. Cell isolation ability of the nanoparticles has been compared based on the computational results. MNPs are biologically activated and permitted to bind with the targeted cells through various pathways, thereby allowing certain cellular compartments to be specifically addressed. Once the cells are identified, the preferred cellular compartments can be magnetically isolated and removed with the help of an external magnetic field. Out of the iron oxides analyzed in this work, 1.1 nm Fe3O4 is found to be most interacting with leukemia protein. Hence, leukemia cells can be effectively targeted, separated, and removed using Fe3O4 of the suggested dimension.

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Ziogas, Panagiotis, Athanasios B. Bourlinos, Jiri Tucek, Ondrej Malina et Alexios P. Douvalis. « Novel Magnetic Nanohybrids : From Iron Oxide to Iron Carbide Nanoparticles Grown on Nanodiamonds ». Magnetochemistry 6, n^o 4 (21 décembre 2020) : 73. http://dx.doi.org/10.3390/magnetochemistry6040073.

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The synthesis and characterization of a new line of magnetic hybrid nanostructured materials composed of spinel-type iron oxide to iron carbide nanoparticles grown on nanodiamond nanotemplates is reported in this study. The realization of these nanohybrid structures is achieved through thermal processing under vacuum at different annealing temperatures of a chemical precursor, in which very fine maghemite (γ-Fe2O3) nanoparticles seeds were developed on the surface of the nanodiamond nanotemplates. It is seen that low annealing temperatures induce the growth of the maghemite nanoparticle seeds to fine dispersed spinel-type non-stoichiometric ~5 nm magnetite (Fe3−xO4) nanoparticles, while intermediate annealing temperatures lead to the formation of single phase ~10 nm cementite (Fe3C) iron carbide nanoparticles. Higher annealing temperatures produce a mixture of larger Fe3C and Fe5C2 iron carbides, triggering simultaneously the growth of large-sized carbon nanotubes partially filled with these carbides. The magnetic features of the synthesized hybrid nanomaterials reveal the properties of their bearing magnetic phases, which span from superparamagnetic to soft and hard ferromagnetic and reflect the intrinsic magnetic properties of the containing phases, as well as their size and interconnection, dictated by the morphology and nature of the nanodiamond nanotemplates. These nanohybrids are proposed as potential candidates for important technological applications in nano-biomedicine and catalysis, while their synthetic route could be further tuned for development of new magnetic nanohybrid materials.

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Claridge, John Bleddyn, et Hans-Conrad zur Loye. « Synthesis, Structure, and Magnetic Properties of a Novel Mixed-Valent Strontium Rhodium Oxide ». Chemistry of Materials 10, n^o 9 (septembre 1998) : 2320–22. http://dx.doi.org/10.1021/cm980324a.

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Li, Shan, Run Chang, Jieda Chen, Gujie Mi, Zelong Xie et Thomas J. Webster. « Novel magnetic nanocomposites combining selenium and iron oxide with excellent anti-biofilm properties ». Journal of Materials Science 55, n^o 3 (17 septembre 2019) : 1012–22. http://dx.doi.org/10.1007/s10853-019-04019-0.

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Ozawa, Takashi, Isao Suzuki et Hirohiko Sato. « Structural, Magnetic and Electronic Transport Properties of Novel Hollandite-Type Molybdenum Oxide, Rb1.5Mo8O16 ». Journal of the Physical Society of Japan 75, n^o 1 (15 janvier 2006) : 014802. http://dx.doi.org/10.1143/jpsj.75.014802.

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Wang, Pengjie, Wei Chen, Rui Zhang et Yanfeng Xing. « Enhanced Removal of Malachite Green Using Calcium-Functionalized Magnetic Biochar ». International Journal of Environmental Research and Public Health 19, n^o 6 (10 mars 2022) : 3247. http://dx.doi.org/10.3390/ijerph19063247.

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To efficiently remove malachite green (MG), a novel calcium-functionalized magnetic biochar (Ca/MBC) was fabricated via a two-step pyrolysis method. Iron-containing oxides endowed the target complexes with magnetic properties, especially the chemotactic binding ability with MG, and the addition of calcium significantly changed the morphology of the material and improved its adsorption performance, especially the chemotactic binding ability with MG, which could be confirmed through FTIR, XPS, and adsorption experiments. Electrostatic adsorption, ligand exchange, and hydrogen bonding acted as essential drivers for an enhanced adsorption process, and the maximum theoretical adsorption capacity was up to 12,187.57 mg/g. Ca/MBC maintained a higher adsorption capacity at pH = 4–12, and after five adsorption–desorption cycles, the adsorption capacity and adsorption rate of MG remained at 1424.2 mg/g and 71.21%, highlighting the advantages of Ca/MBC on adsorbing MG. This study suggests that biochar can be modified by a green synthesis approach to produce calcium-functionalized magnetic biochar with excellent MG removal capacity. The synthetic material can not only remove pollutants from water but also provide an efficient way for soil remediation.

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Gall, Philippe, Rabih Al Rahal Al Orabi, Thierry Guizouarn et Patrick Gougeon. « Synthesis, crystal structure and magnetic properties of Li2InMo3O8 : A novel reduced molybdenum oxide containing magnetic Mo3 clusters ». Journal of Solid State Chemistry 208 (décembre 2013) : 99–102. http://dx.doi.org/10.1016/j.jssc.2013.10.006.

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