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Articles de revues sur le sujet « Multiferroic Behavior »

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Auteur : Grafiati
Publié le 7 septembre 2023

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1

Gilioli, Edmondo, et Lars Ehm. « High pressure and multiferroics materials : a happy marriage ». IUCrJ 1, no 6 (31 octobre 2014) : 590–603. http://dx.doi.org/10.1107/s2052252514020569.

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The community of material scientists is strongly committed to the research area of multiferroic materials, both for the understanding of the complex mechanisms supporting the multiferroism and for the fabrication of new compounds, potentially suitable for technological applications. The use of high pressure is a powerful tool in synthesizing new multiferroic, in particular magneto-electric phases, where the pressure stabilization of otherwise unstable perovskite-based structural distortions may lead to promising novel metastable compounds. Thein situinvestigation of the high-pressure behavior of multiferroic materials has provided insight into the complex interplay between magnetic and electronic properties and the coupling to structural instabilities.
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2

Hemberger, J., P. Lunkenheimer, R. Fichtl, S. Weber, V. Tsurkan et A. Loidl. « Multiferroic behavior in ». Physica B : Condensed Matter 378-380 (mai 2006) : 363–66. http://dx.doi.org/10.1016/j.physb.2006.01.407.

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3

Makarova, Liudmila A., Danil A. Isaev, Alexander S. Omelyanchik, Iuliia A. Alekhina, Matvey B. Isaenko, Valeria V. Rodionova, Yuriy L. Raikher et Nikolai S. Perov. « Multiferroic Coupling of Ferromagnetic and Ferroelectric Particles through Elastic Polymers ». Polymers 14, no 1 (31 décembre 2021) : 153. http://dx.doi.org/10.3390/polym14010153.

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Multiferroics are materials that electrically polarize when subjected to a magnetic field and magnetize under the action of an electric field. In composites, the multiferroic effect is achieved by mixing of ferromagnetic (FM) and ferroelectric (FE) particles. The FM particles are prone to magnetostriction (field-induced deformation), whereas the FE particles display piezoelectricity (electrically polarize under mechanical stress). In solid composites, where the FM and FE grains are in tight contact, the combination of these effects directly leads to multiferroic behavior. In the present work, we considered the FM/FE composites with soft polymer bases, where the particles of alternative kinds are remote from one another. In these systems, the multiferroic coupling is different and more complicated in comparison with the solid ones as it is essentially mediated by an electromagnetically neutral matrix. When either of the fields, magnetic or electric, acts on the ‘akin’ particles (FM or FE) it causes their displacement and by that perturbs the particle elastic environments. The induced mechanical stresses spread over the matrix and inevitably affect the particles of an alternative kind. Therefore, magnetization causes an electric response (due to the piezoeffect in FE) whereas electric polarization might entail a magnetic response (due to the magnetostriction effect in FM). A numerical model accounting for the multiferroic behavior of a polymer composite of the above-described type is proposed and confirmed experimentally on a polymer-based dispersion of iron and lead zirconate micron-size particles.
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4

Zapf, V. S., F. Wolff-Fabris, M. Kenzelmann, F. Nasreen, F. Balakirev, Y. Chen et A. Paduan-Filho. « Multiferroic behavior in organo-metallics ». Journal of Physics : Conference Series 273 (1 janvier 2011) : 012132. http://dx.doi.org/10.1088/1742-6596/273/1/012132.

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5

Fier, I., L. Walmsley et J. A. Souza. « Relaxor behavior in multiferroic BiMn2O5 ceramics ». Journal of Applied Physics 110, no 8 (15 octobre 2011) : 084101. http://dx.doi.org/10.1063/1.3650455.

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6

Sagar, S., P. A. Joy et M. R. Anantharaman. « Multiferroic Behavior of Gd Based Manganite ». Ferroelectrics 392, no 1 (24 novembre 2009) : 13–19. http://dx.doi.org/10.1080/00150190903412408.

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7

Acharya, S., J. Mondal, S. Ghosh, S. K. Roy et P. K. Chakrabarti. « Multiferroic behavior of lanthanum orthoferrite (LaFeO3) ». Materials Letters 64, no 3 (février 2010) : 415–18. http://dx.doi.org/10.1016/j.matlet.2009.11.037.

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8

Jin, Ke, et Jacob Aboudi. « Macroscopic behavior prediction of multiferroic composites ». International Journal of Engineering Science 94 (septembre 2015) : 226–41. http://dx.doi.org/10.1016/j.ijengsci.2015.06.002.

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9

Pan, Feng, Xue Jing Liu, Yu Chao Yang, Cheng Song et Fei Zeng. « Multiferroic and Piezoelectric Behavior of Transition-Metal Doped ZnO Films ». Materials Science Forum 620-622 (avril 2009) : 735–40. http://dx.doi.org/10.4028/www.scientific.net/msf.620-622.735.

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In this paper, we report the multiferroic and piezoelectric behavior observed in transition-metal doped ZnO films. The experimental results indicated that the Co-doped ZnO films deposited by magnetron sputtering possess a Curie temperature higher than 700K, and the magnetic moments of Co are intimatedly correlated to the doping concentration and the substrate. A giant magnetic moment of 6.1 B/Co is observed in (4 at.%) Co-doped ZnO films. Ferroelectric and ferromagnetic behaviors simultaneously were also obtained in V and Cr doped ZnO films on Pt(111)/Ti/SiO2/Si(100) substrates by reactive sputtering method, revealing a multiferroic nature. The high piezoelectric d33 coefficient 80-120 pm/V has also been achieved by Cr and V substitutions, which could make Cr-doped or V-doped ZnO a promising material in piezoelectric devices.
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10

Wang, X. X., X. Y. Cheng, Y. Lin, C. Ma, K. Q. Ruan et X. G. Li. « Multiferroic properties of hexagonal Ba3Ti2MnO9 ». RSC Advances 5, no 123 (2015) : 101544–51. http://dx.doi.org/10.1039/c5ra18392h.

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11

Tian, Z. M., Y. S. Zhang, S. L. Yuan, M. S. Wu, C. H. Wang, Z. Z. Ma, S. X. Huo et H. N. Duan. « Enhanced multiferroic properties and tunable magnetic behavior in multiferroic BiFeO3–Bi0.5Na0.5TiO3 solid solutions ». Materials Science and Engineering : B 177, no 1 (janvier 2012) : 74–78. http://dx.doi.org/10.1016/j.mseb.2011.07.012.

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12

Fumega, Adolfo O., et J. L. Lado. « Microscopic origin of multiferroic order in monolayer NiI2 ». 2D Materials 9, no 2 (9 février 2022) : 025010. http://dx.doi.org/10.1088/2053-1583/ac4e9d.

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Abstract The discovery of multiferroic behavior in monolayer NiI2 provides a new symmetry-broken state in van der Waals monolayers, featuring the simultaneous emergence of helimagnetic order and ferroelectric order at a critical temperature of T = 21 K. However, the microscopic origin of multiferroic order in NiI2 monolayer has not been established, and in particular, the role of non-collinear magnetism and spin–orbit coupling in this compound remains an open problem. Here we reveal the origin of the two-dimensional multiferroicity in NiI2 using first-principles electronic structure methods. We show that the helimagnetic state appears as a consequence of the long-range magnetic exchange interactions, featuring sizable magnetic moments in the iodine atoms. We demonstrate that the electronic density reconstruction accounting for the ferroelectric order emerges from the interplay of non-collinear magnetism and spin–orbit coupling. We demonstrate that the ferroelectric order is controlled by the iodine spin–orbit coupling, and leads to an associated electronically-driven distortion in the lattice. Our results establish the microscopic origin of the multiferroic behavior in monolayer NiI2, putting forward the coexistence of helical magnetic order and ligand spin–orbit coupling as driving forces for multiferroic behavior in two-dimensional materials.
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13

Ribeiro, R. A. P., E. Longo, J. Andrés et S. R. de Lazaro. « A DFT investigation of the role of oxygen vacancies on the structural, electronic and magnetic properties of ATiO3 (A = Mn, Fe, Ni) multiferroic materials ». Physical Chemistry Chemical Physics 20, no 45 (2018) : 28382–92. http://dx.doi.org/10.1039/c8cp04443k.

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In order to achieve deep insight into the multiferroic behavior and electronic properties of intrinsic oxygen vacancies in ATiO3 (A = Mn, Fe, Ni), first-principles calculations were carried out for bulk and non-polar (110) surface models, showing that controlling oxygen vacancies can be a valuable strategy to tailor the multiferroic properties.
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14

Wang, Hua, et Xiaofeng Qian. « Ferroicity-driven nonlinear photocurrent switching in time-reversal invariant ferroic materials ». Science Advances 5, no 8 (août 2019) : eaav9743. http://dx.doi.org/10.1126/sciadv.aav9743.

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Nonlinear optical responses to external electromagnetic field, characterized by second- and higher-order susceptibilities, play crucial roles in nonlinear optics and optoelectronics. Here, we demonstrate the possibility to achieve ferroicity-driven nonlinear photocurrent switching in time-reversal invariant multiferroics. It is enabled by the second-order current response to electromagnetic field whose direction can be controlled by both internal ferroic orders and external light polarization. Second-order direct photocurrent consists of shift current and circular photocurrent under linearly and circularly polarized light irradiation, respectively. We elucidate the microscopic mechanism in a representative class of two-dimensional multiferroic materials using group theoretical analyses and first-principles theory. The complex interplay of symmetries, shift vector, and Berry curvature governs the fundamental properties and switching behavior of shift current and circular photocurrent. Ferroicity-driven nonlinear photocurrent switching will open avenues for realizing nonlinear optoelectronics, nonlinear multiferroics, etc., using the coupled ferroic orders and nonlinear responses of ferroic materials under external field.
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15

Cao, Haixing, Xianming Ren, Meibing Ma, Xin Yin, Yemei Han, Kai Hu, Zheng Sun, Fang Wang et Kailiang Zhang. « Multiferroic behavior of CoFe1.6Al0.4O4 spinel thin films ». Materials Letters 314 (mai 2022) : 131900. http://dx.doi.org/10.1016/j.matlet.2022.131900.

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16

Maignan, Antoine, Wei Peng, Alexander Christoph Komarek, Chang-Yang Kuo, Chun-Fu Chang, Xiao Wang, Zhiwei Hu et al. « Spin-Induced Multiferroic Behavior in Centrosymmetric Mn3WO6 ». Chemistry of Materials 32, no 13 (11 juin 2020) : 5664–69. http://dx.doi.org/10.1021/acs.chemmater.0c01303.

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17

Nagaosa, Naoto. « Theory of multiferroic behavior in cycloidal helimagnets ». Journal of Physics : Condensed Matter 20, no 43 (9 octobre 2008) : 434207. http://dx.doi.org/10.1088/0953-8984/20/43/434207.

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18

Bahoosh, S. G., et J. M. Wesselinowa. « Critical behavior of multiferroic hexagonal R MnO3 ». physica status solidi (b) 249, no 11 (27 juillet 2012) : 2227–30. http://dx.doi.org/10.1002/pssb.201248297.

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19

Li, Zheng, Kun Tao, Jing Ma, Zhipeng Gao, Vladimir Koval, Changjun Jiang, Giuseppe Viola et al. « Bi3.25La0.75Ti2.5Nb0.25(Fe0.5Co0.5)0.25O12, a single phase room temperature multiferroic ». Journal of Materials Chemistry C 6, no 11 (2018) : 2733–40. http://dx.doi.org/10.1039/c8tc00161h.

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20

Hassanpour, Ehsan, Yannik Zemp, Yusuke Tokunaga, Yasujiro Taguchi, Yoshinori Tokura, Thomas Lottermoser, Manfred Fiebig et Mads C. Weber. « Magnetoelectric transfer of a domain pattern ». Science 377, no 6610 (2 septembre 2022) : 1109–12. http://dx.doi.org/10.1126/science.abm3058.

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The utility of ferroic materials is determined by the formation of domains and their poling behavior under externally applied fields. For multiferroics, which exhibit several types of ferroic order at once, it is also relevant how the domains of the coexisting ferroic states couple and what kind of functionality this might involve. In this work, we demonstrate the reversible transfer of a domain pattern between magnetization and electric-polarization space in the multiferroic Dy 0.7 Tb 0.3 FeO 3 . A magnetic field transfers a ferromagnetic domain pattern into an identical ferroelectric domain pattern while erasing it at its magnetic origin. Reverse transfer completes the cycle. To assess the generality of our experiment, we elaborate on its conceptual origin and aspects of application.
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21

CHEN, W., C. X. HUANG, T. S. YAN, W. ZHU, Z. P. LI, X. F. CHEN et O. K. TAN. « SYNTHESIS OF CoFe2O4/Pb(Zr0.53Ti0.47)O3 MULTIFERROIC COMPOSITE THICK FILMS BY LOW-SINTERING-TEMPERATURE SCREEN PRINTING METHOD ». Journal of Advanced Dielectrics 01, no 01 (janvier 2011) : 119–25. http://dx.doi.org/10.1142/s2010135x1100015x.

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CoFe 2 O 4/ Pb ( Zr 0.53 Ti 0.47) O 3 (abbreviated as CFO/PZT) multiferroic composite thick films were successfully fabricated on alumina substrate with gold bottom electrode by screen printing method at a low-sintering temperature. The processing included the modification and dispersion of ferromagnetic CFO powder and ferroelectric PZT powder, the preparation of uniform pastes, and the selection of proper annealing temperature for composite thick films. Transmission electron microscopic pictures (TEM) indicated the submicron meter of particles size for both CFO and PZT particles. After annealing at 900°C for 1 h in air, tape test confirmed the quality of multiferroic thick films as well as pure CFO and PZT films. X-ray diffraction (XRD) showed a coexistence of CFO and PZT phases; furthermore, a smooth surface was observed through scanning electron microscopic (SEM) pictures along with the sharp cross-sectional picture, indicative of 100 μm of film thickness. Ferromagnetic and ferroelectric properties were observed in CFO/PZT films simultaneously at room temperature. Compared with the reported CFO/PZT multiferrroic thin films, the present ferromagnetic property was closing to that of the chemical sol-gel synthesized film and even that from the physical pulsed laser deposition technique. However, the ferroelectric property showed a degenerated behavior, possible reasons for this was discussed and further optimization was also proposed for the potential multifunctional application.
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22

Spurgeon, Steven. « Epitaxial strain tunes spintronic behavior of multiferroic BiFeO3 ». MRS Bulletin 38, no 7 (juillet 2013) : 529. http://dx.doi.org/10.1557/mrs.2013.164.

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23

Mito, S., H. Takagi, A. V. Baryshev et M. Inoue. « Multiferroic behavior of disordered bismuth-substituted zinc ferrite ». Journal of Applied Physics 111, no 7 (avril 2012) : 07D911. http://dx.doi.org/10.1063/1.3674283.

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24

Chen, W., S. Shannigrahi, X. F. Chen, Z. H. Wang, W. Zhu et O. K. Tan. « Multiferroic behavior and magnetoelectric effect in thick films ». Solid State Communications 150, no 5-6 (février 2010) : 271–74. http://dx.doi.org/10.1016/j.ssc.2009.11.009.

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Bhardwaj, Sumit, Joginder Paul, K. K. Raina, N. S. Thakur et Ravi Kumar. « Dielectric modulus and magnetocapacitance behavior of Bi3.7Sm0.3Ti2.7Fe0.3O12 multiferroic ». Physica B : Condensed Matter 448 (septembre 2014) : 194–98. http://dx.doi.org/10.1016/j.physb.2014.04.062.

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26

Sun, Hui, Xiangyu Mao, Hao Wang et Xiaobing Chen. « Multiferroic Behavior and Orientation Dependence of Bi5Fe0.5Co0.5Ti3O15Thin Film ». Ferroelectrics 452, no 1 (janvier 2013) : 63–68. http://dx.doi.org/10.1080/00150193.2013.841503.

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Maiti, R. P., S. Dutta, S. Basu, M. K. Mitra et Dipankar Chakravorty. « Multiferroic behavior in glass–crystal nanocomposites containing Te2NiMnO6 ». Journal of Alloys and Compounds 509, no 20 (mai 2011) : 6056–60. http://dx.doi.org/10.1016/j.jallcom.2011.03.007.

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28

Rosales-González, O., F. Sánchez-De Jesús, C. A. Cortés-Escobedo et A. M. Bolarín-Miró. « Crystal structure and multiferroic behavior of perovskite YFeO3 ». Ceramics International 44, no 13 (septembre 2018) : 15298–303. http://dx.doi.org/10.1016/j.ceramint.2018.05.175.

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Wu, Y. J., L. H. Tang, H. L. Li et X. M. Chen. « Dielectric and aging behavior of multiferroic YbMnO3 ceramics ». Journal of Alloys and Compounds 496, no 1-2 (avril 2010) : 269–72. http://dx.doi.org/10.1016/j.jallcom.2010.01.102.

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Jena, A. K., S. Satapathy et J. Mohanty. « Magnetic properties and oxygen migration induced resistive switching effect in Y substituted multiferroic bismuth ferrite ». Physical Chemistry Chemical Physics 21, no 28 (2019) : 15854–60. http://dx.doi.org/10.1039/c9cp02528f.

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31

Hassanpour Amiri, Morteza, Hamed Sharifi Dehsari et Kamal Asadi. « Magnetoelectric coupling coefficient in multiferroic capacitors : Fact vs Artifacts ». Journal of Applied Physics 132, no 16 (28 octobre 2022) : 164102. http://dx.doi.org/10.1063/5.0107365.

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Multiferroic materials are characterized by their magnetoelectric coupling coefficient, which can be obtained using a lock-in amplifier by measuring the voltage developed across a multiferroic capacitor in a time-variable magnetic field, Hac cos( ωt), where Hac and ω are the amplitude and frequency of the applied magnetic field. The measurement method, despite its simplicity, is subject to various parasitic effects, such as magnetic induction, which leads to significant over-estimation of the actual magnetoelectric response. This article outlines the measurement theory for a multiferroic capacitor using the lock-in technique. It is demonstrated that the inductive contribution has linear proportionality with Hac, ω, and Hacω. It is shown that the true magnetoelectric coupling response is retrieved from the real component of the lock-in signal. Using a polymer-nanoparticle multiferroic composite, the internal consistency of the proposed measurement method is experimentally demonstrated, and it is shown that the actual multiferroic signal can be retrieved using the lock-in technique by removing the magnetic induction contribution from the signal. It is observed that the magnetoelectric voltage shows only a linear dependence with Hac, a saturating behavior with ω, and Hacω. Furthermore, a measurement protocol for reliable reporting of magnetoelectric coupling coefficient has been provided.
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32

Slutsker, Julia, Zhuopeng Tan, Alexander L. Roytburd et Igor Levin. « Thermodynamic aspects of epitaxial self-assembly and magnetoelectric response in multiferroic nanostructures ». Journal of Materials Research 22, no 8 (août 2007) : 2087–95. http://dx.doi.org/10.1557/jmr.2007.0286.

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A thermodynamic approach was used to describe the formation and magnetoelectric response of composite multiferroic films. Experimental and theoretical results that address the origins of different phase morphologies in epitaxial spinel-perovskite nanostructures grown on differently oriented substrates are presented. A theoretical model of magnetoelectric coupling in multiferroic nanostructures that considers a microscopic mechanism of magnetization in single-domain magnetic nanorods is described. This model explains a discontinuous electromagnetic coupling, as observed experimentally, and predicts a hysteretic behavior of magnetization under external electric fields.
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Aggarwal, Snehlata, S. Chakrabarti, R. Pinto et V. R. Palkar. « Room temperature magnetoelectric multiferroic behavior of 50 mol% Fe substituted PbTiO3 (PbTi0.5Fe0.5O3−δ) nanoparticles ». RSC Advances 6, no 93 (2016) : 90132–37. http://dx.doi.org/10.1039/c6ra14681c.

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The magnetic, ferroelectric and magnetoelectric measurements at room temperature corroborate the multiferroic nature of Pb(Fe0.5Ti0.5)O3−δ nanoparticles with significant magnetoelectric coupling.
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Cheng, Xiangyi, Xiaoxiong Wang, Hongshun Yang, Keqing Ruan et Xiaoguang Li. « Multiferroic properties of the layered perovskite-related oxide La6(Ti0.67Fe0.33)6O20 ». Journal of Materials Chemistry C 3, no 17 (2015) : 4482–89. http://dx.doi.org/10.1039/c5tc00188a.

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Yang, Y. C., C. F. Zhong, X. H. Wang, B. He, S. Q. Wei, F. Zeng et F. Pan. « Room temperature multiferroic behavior of Cr-doped ZnO films ». Journal of Applied Physics 104, no 6 (15 septembre 2008) : 064102. http://dx.doi.org/10.1063/1.2978221.

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Pradhan, S. K., et B. K. Roul. « Electrical behavior of high resistivity Ce-doped BiFeO3 multiferroic ». Physica B : Condensed Matter 407, no 13 (juillet 2012) : 2527–32. http://dx.doi.org/10.1016/j.physb.2012.03.061.

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Singh, Davinder, B. Mallesham, Akshay Deshinge, Kunal Joshi, R. Ranjith et Viswanath Balakrishnan. « Nanomechanical behavior of Pb(Fe0.5−xScxNb0.5)O3 multiferroic ceramics ». Materials Research Express 5, no 11 (12 septembre 2018) : 116303. http://dx.doi.org/10.1088/2053-1591/aade3b.

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Lee, Seongsu, Misun Kang, Changhee Lee, A. Hoshikawa, M. Yonemura, T. Kamiyama et J. G. Park. « Multiferroic behavior and two-dimensional magnetism of hexagonal manganites ». Physica B : Condensed Matter 385-386 (novembre 2006) : 405–7. http://dx.doi.org/10.1016/j.physb.2006.05.084.

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Aimon, Nicolas M., Dong Hun Kim, XueYin Sun et C. A. Ross. « Multiferroic Behavior of Templated BiFeO3–CoFe2O4 Self-Assembled Nanocomposites ». ACS Applied Materials & ; Interfaces 7, no 4 (23 janvier 2015) : 2263–68. http://dx.doi.org/10.1021/am506089c.

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40

Varshney, Dinesh, et Ashwini Kumar. « Structural, Raman and dielectric behavior in Bi1−xSrxFeO3 multiferroic ». Journal of Molecular Structure 1038 (avril 2013) : 242–49. http://dx.doi.org/10.1016/j.molstruc.2013.01.065.

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41

Ding, Hang-Chen, Ya-Wei Li, Wanjiao Zhu, Yong-Chao Gao, Shi-Jing Gong et Chun-Gang Duan. « Improved multiferroic behavior in [111]-oriented BiFeO3/BiAlO3 superlattice ». Journal of Applied Physics 113, no 12 (28 mars 2013) : 123703. http://dx.doi.org/10.1063/1.4795847.

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42

Quan, Ngo Due, Nguyen Due Minh et Hoang Viet Hung. « Effect of Structural Deficiencies on Bi-Ferroic Behaviors of Lead-Free Bi0.5 Na0.40K0.10TiO3 Films ». Journal of Nanoscience and Nanotechnology 21, no 11 (1 novembre 2021) : 5653–58. http://dx.doi.org/10.1166/jnn.2021.19477.

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Lead-free Bi0.5Na0.4K0.1TiO3 (BNKT) ferroelectric films on Pt/TI/SIO2/Si substrates were prepared via a sol-gel spin coating routine. The microstructures and multiferroic behaviors of the films were examined intimately as a function of the annealing time. A rise of annealing time enhanced the crystallization of the films via the perovskite structure. The multiferroic behavior, including simultaneously the magnetic and ferroelectric orders, was observed altogether the films. When the annealing time rose, ferroelectric and magnetic properties were found significantly increased. The remnant polarization (Pr), also as maximum polarization (Pm) respectively increased to the very best values of 11.5 µC/cm2 and 40.0 µC/cm2 under an applied electric field of 500 kV/cm. The saturated magnetization (Ms) of films increased to 2.3 emu/cm3 for the annealing time of 60 minutes. Oxygen vacancies, originating from the evaporation of metal ions during annealing at high temperatures are attributed to the explanation for ferromagnetism within the BNKT films.
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Dutta, Papia, S. K. Mandal et A. Nath. « Room Temperature Magnetoelectric Coupling, Electrical, and Optical Properties of BaFe2O4 – ZnO Nanocomposites ». Integrated Ferroelectrics 201, no 1 (2 septembre 2019) : 192–200. http://dx.doi.org/10.1080/10584587.2019.1668703.

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Polycrystalline multiferroic nanocomposites with general formula xBaFe2O4 – (1 – x) ZnO (x = 0.2, 0.3, and 0.5) are prepared by chemical pyrophoric reaction method and solid-state route. The samples are characterized by X-ray diffraction which indicates the formation of both the phases in the composites. The morphological analysis and elemental compositions have been identified by using field emission scanning electron microscope and energy-dispersive X-ray analysis techniques. These micrographs reveal the particle sizes are in the nanometer dimension. The band gap of the nanocomposites is estimated employing UV-Vis spectroscopy. The DC electrical resistivity exhibits a metal-semiconductor transition for all the nanocompositions. Temperature-dependent AC conductivity of the nanocomposites is found to obey the Jonscher’s power law. The room temperature multiferroic behavior of the nanocomposites is confirmed from the detailed magnetoelectric response studies. The coupling coefficient is obtained maximum for x = 0.5 compositions for both in transverse and longitudinal mode due to the more ferrite content i.e., more magnetostrictive behaviour in the nanocompositions.
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Shi, Yang, et Yongkun Wang. « Size-Dependent and Multi-Field Coupling Behavior of Layered Multiferroic Nanocomposites ». Materials 12, no 2 (14 janvier 2019) : 260. http://dx.doi.org/10.3390/ma12020260.

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The prediction of magnetoelectric (ME) coupling in nano-scaled multiferroic composites is significant for nano-devices. In this paper, we propose a nonlinear multi-field coupling model for ME effect in layered multiferroic nanocomposites based on the surface stress model, strain gradient theory and nonlinear magneto-elastic-thermal coupling constitutive relation. With this novel model, the influence of external fields on strain gradient and flexoelectricity is discussed for the first time. Meanwhile, a comprehensive investigation on the influence of size-dependent parameters and multi-field conditions on ME performance is made. The numerical results show that ME coupling is remarkably size-dependent as the thickness of the composites reduces to nanoscale. Especially, the ME coefficient is enhanced by either surface effect or flexoelectricity. The strain gradient in composites at the nano-scale is significant and influenced by the external stimuli at different levels via the change in materials’ properties. More importantly, due to the nonlinear multi-field coupling behavior of ferromagnetic materials, appropriate compressive stress and temperature may improve the value of ME coefficient and reduce the required magnetic field. This paper provides a theoretical basis to analyze and evaluate multi-field coupling characteristics of nanostructure-based ME devices.
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45

Das, Souvick, Ayan Mitra, Sukhendu Sadhukhan, Amitabh Das, Souvik Chatterjee et Pabitra K. Chakrabarti. « Spin reorientation behavior and enhanced multiferroic properties of co-doped YFeO3 towards a monophasic multiferroic ceramic Co0.05Y0.95Fe0.95Ti0.05O3 ». Advanced Powder Technology 33, no 6 (juin 2022) : 103622. http://dx.doi.org/10.1016/j.apt.2022.103622.

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Mahesh, R., et P. Venugopal Reddy. « Role of Nd and Gd Dopants on Multiferroic Behavior of BiFeO-=SUB=-3-=/SUB=- --- A First-Principle Study ». Физика твердого тела 63, no 10 (2021) : 1552. http://dx.doi.org/10.21883/ftt.2021.10.51404.pss165.

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Electronic band structure, ferroelectric, and magnetic properties of multiferroic Bi1.xRExFeO3 (x=0, 0.16, 0.32, 0.5; RE=Nd and Gd) doped compounds have been investigated using TB-mBJ semi-local (Tran--Blaha modified Becke--Johnson) potential approximation method and WIEN2k code. As spin.orbit coupling (SOC) influences several properties of these materials, SOC corrections were also included in the present study. On the basis of varying band gap values, it has been concluded that the leakage current might have decreased with increasing dopant concentration. It has been concluded from the charge density studies that stereo chemically active 6S2 lone-pair electrons are present at Bi sites and they might be responsible for the displacements of Bi atoms from the centrosymmetric to the non-centrosymmetric structure position leading to the exhibition of ferroelectricity. It was also observed that magnetic moments of iron ions are not integral values probably due to hybridization of Fe electrons with neighboring O ions. To understand ferroelctric properties of these compounds, the real and imaginary parts of the dielectric functions were obtained at ambient conditions and were analyzed using TB-mBJ + SOCpotentials. Finally, it has been concluded that the results obtained in the present investigations may be useful in predicting the properties of bismuth ferrite for possible applications in industry. Keywords: multiferroics, TB-mBJ exchange potential, charge density, spin--orbit coupling (SOC),
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47

Urcelay-Olabarria, Irene, Juan Manuel Perez-Mato, José Luis García Muñoz et Eric Ressouche. « Sheding light on the multiferroicity in Mn1-xCoxWO4using superspace formalism ». Acta Crystallographica Section A Foundations and Advances 70, a1 (5 août 2014) : C519. http://dx.doi.org/10.1107/s2053273314094807.

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The use of the superspace symmetry formalism allows to rationalize the physical properties induced by an incommensurate magnetic ordering [1]. The incommensurate magnetic structures (ICMS) in Mn1-xCoxWO4 have been studied in the light of this formalism. MnWO4 is a multiferroic material in which the magnetic order of one of its magnetic phases induces ferroelectricity. Like most multiferroic materials MnWO4 is extremely sensitive to small perturbations such as chemical substitution. It turned out that doping with Co2+ is particularly interesting since it strongly stabilizes the multiferroic phase at low temperatures, and moreover, by increasing the cobalt amount in the crystals the orientation of the electric polarization flops from the b axis to the ac plane [2]. This change of orientation is linked to a symmetry change. The ICMS of the x = 0 and x = 0.10 compounds, which exhibit completely different behavior, have been studied thoroughly using superspace formalism. We have found, not only the symmetry of the magnetic structures and their intrinsic restrictions, but also information about the tensor properties of each incommensurate phase, such as ferroelectric and magnetostructural properties [3]: in the paramagnetic state, there is a unique independent magnetic atom in the crystallographic unit cell in both cases, but when the system enters into the multiferroic phase, this is no-longer true. In the multiferroic phase of MnWO4, the two Mn atoms in the unit cell become symmetry independent, whereas in the x = 0.10 substituted compound, they are still symmetry-related. This difference is related to the change of the electric polarization.
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Ravi, S., et C. Senthilkumar. « Anomalous magnetic behavior of Bi2NiCrO6 nanoparticles with multiferroic behavior synthesized using gel combustion ». Ceramics International 46, no 3 (février 2020) : 3976–78. http://dx.doi.org/10.1016/j.ceramint.2019.09.251.

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Li, Zheng, et Baozeng Zhou. « Theoretical investigation of nonvolatile electrical control behavior by ferroelectric polarization switching in two-dimensional MnCl3/CuInP2S6 van der Waals heterostructures ». Journal of Materials Chemistry C 8, no 13 (2020) : 4534–41. http://dx.doi.org/10.1039/d0tc00143k.

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A model of atom-thick multiferroic memory whose data writing depends on ferroelectric CuInP2S6 and data reading is based on different electric signals induced by magnetoelectrical coupling.
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Kozielski, Lucjan, Dariusz Bochenek, Frank Clemens et Tutu Sebastian. « Magnetoelectric Composites : Engineering for Tunable Filters and Energy Harvesting Applications ». Applied Sciences 13, no 15 (31 juillet 2023) : 8854. http://dx.doi.org/10.3390/app13158854.

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Multiferroic ceramic composites have been engineered to incorporate multiple desired physical properties within a single ceramic component. The objective of this study was to create such composites through pressure less sintering ferroelectric-doped PZT and nickel–zinc ferrite at a temperature of 1250 °C. The growth of ferrite grains was found to be influenced by the concentration of the ferroelectric PZT phase. Consequently, an increase in the ferrite content decreased the average particle size of nickel–zinc ferrite by a factor of 1.8. After impedance spectroscopy, the multiferroic ceramic composites can be categorized into two groups: those with low ferrite content (<20%) and those with a high ferrite content (>20%). Composites with a high ferrite content are suitable for dual-band filters or shield applications. The impedance spectroscopy analysis revealed that the resonance frequency can be shifted to higher frequency ranges. Therefore, it was demonstrated that modifying the composition of the multiferroic composite allows for tailoring the impedance behavior to shield living and working spaces against such radiation to meet the demands of the 21st century.
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