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Artículos de revistas sobre el tema "Spin-canting angle"

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Autor: Grafiati

Publicado: 14 de marzo de 2023

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Pebler, J., C. Frommen y M. Mangold. "Magnetic Susceptibility Calculated from Correlation-Lengths Derived by Mössbauer Relaxation Spectra". Zeitschrift für Naturforschung A 54, n.º 5 (1 de mayo de 1999): 317–28. http://dx.doi.org/10.1515/zna-1999-0508.

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From the knowledge of the spin correlation functions derived from Mössbauer relaxation spectra of quasi-one-dimensional A2Mn0.98Fe()()2F5(H2O) we could fit the antiferromagnetic susceptibilities of A2MnF5(H2O) with A = Na+, (NH4)+, K+, Rb+ obtained for single crystal samples. The calculation yielded characteristic parameters such as the local anisotropy D, the intra-chain exchange energy J, the inter-chain exchange energy |Jʹ|, the Neel temperature TN, and the spin canting angle φ.

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Cadogan, J. M., Pierric Lemoine, Brianna R. Slater, Arthur Mar y Maxim Avdeev. "Neutron Diffraction Study of the Hexagonal Perovskite-Type Compound LaCrGe₃". Solid State Phenomena 194 (noviembre de 2012): 71–74. http://dx.doi.org/10.4028/www.scientific.net/ssp.194.71.

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The BaNiO3-type structure and the ferromagnetic order (TC = 78 K) of the Cr sublattice in LaCrGe3 have been confirmed by neutron powder diffraction measurements. At 20 K, the magnetic structure is collinear along the c axis with a Cr magnetic moment of 1.24(4) μB. Below 3 K, LaCrGe3 has a spin-canted ferromagnetic structure with a canting angle θ of 32(6) and a Cr magnetic moment of 1.31(4) μB at 1.7 K.

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Jaoqueline E. M. Allan, J. M. D. Coey, I. S. Sanders, U. Schwertmann, G. Friedrich y A. Wiechowski. "An occurrence of a fully-oxidized natural titanomaghemite in basalt". Mineralogical Magazine 53, n.º 371 (junio de 1989): 299–304. http://dx.doi.org/10.1180/minmag.1989.053.371.04.

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AbstractTitanomaghemite occurs in a relatively fresh doleritic intrusion in an area of Precambrian gneiss in Minas Gerais, Brazil. It hosts exsolution lamellae of ilmenite and contains more than 90% of the iron in the ferric form. It is more resistant to weathering than the ilmenite and is inherited virtually unaltered by the resulting soils. Titanomaghemite, extracted as grains from a weathered rind of the rock, has lattice parameter a0 = 0.8348(3) nm and has a canted spin structure due to substitution of non-magnetic ions on tetrahedral and octahedral sites of the spinel structure. The average canting angle is 32 ± 3° and canting occurs predominantly on the octahedral iron sublattice. Its formula, based on microprobe analysis and Mössbauer spectroscopy may be expressed as:where [] and {} denote ions on tetrahedral and octahedral sites, respectively. The spontaneous magnetization of the mineral is 36(3) J/T/kg.

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Brown, R. H., D. M. C. Nicholson, W. H. Butler, X. G. Zhang, W. A. Shelton, T. C. Schulthess y J. M. MacLaren. "Calculation of the canting angle dependence of the resistivity in Cu|Co spin valves". Journal of Applied Physics 81, n.º 8 (15 de abril de 1997): 4008–10. http://dx.doi.org/10.1063/1.364922.

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Liu, Ting, Su-Mei Gao, Long-Yang Xu, Jiong-Peng Zhao, Fu-Chen Liu, Hai-Liang Hu y Zhen-Hui Kang. "Design and Synthesis of Stable Cobalt-Based Weak Ferromagnetic Framework with Large Spin Canting Angle". Inorganic Chemistry 53, n.º 24 (2 de diciembre de 2014): 13042–48. http://dx.doi.org/10.1021/ic502177k.

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Ibarra, R., E. Lesne, B. Ouladdiaf, K. Beauvois, A. S. Sukhanov, R. Wawrzyńczak, W. Schnelle et al. "Noncollinear magnetic order in epitaxial thin films of the centrosymmetric MnPtGa hard magnet". Applied Physics Letters 120, n.º 17 (25 de abril de 2022): 172403. http://dx.doi.org/10.1063/5.0090009.

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Magnetic systems exhibiting spin-canted states have garnered much attention recently for their promising rich exotic properties driven by the real-space spin textures and competing magnetic orders. In this study, we present the structural and magnetic properties of hexagonal 60 nm MnPtGa epitaxial thin films grown by magnetron sputtering on Al2O3(0001) single-crystalline substrates. The MnPtGa film crystallizes in the centrosymmetric P63/ mmc (No. 194) space group, showing perpendicular magnetic anisotropy along the c-axis, with a Curie temperature TC = 263 K. In addition, the MnPtGa film undergoes a spin reorientation transition at Tsr = 160 K. We investigated the MnPtGa magnetic ground states using single-crystal neutron diffraction. A structurally forbidden (001) magnetic Bragg reflection emerges below Tsr, indicating the existence of a spin-canted state, where the magnetic moments align ferromagnetically perpendicular to the basal plane, and a non-zero in-plane component exhibits an antiferromagnetic ordering along the c-axis. At 2 K, the refined magnetic moments of Mn are μz = 4.2(4) μB and μx = 1.5(3) μB, projected onto the c-axis and basal plane, respectively. Hence, we determined a 20° Mn spin canting angle off from the c-axis.

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Pietzsch, Oswald y Roland Wiesendanger. "Non-collinear magnetic order in nanostructures investigated by spin-polarized scanning tunneling microscopy". Pure and Applied Chemistry 83, n.º 11 (10 de julio de 2011): 1981–88. http://dx.doi.org/10.1351/pac-con-11-02-09.

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The successful conjunction of the ultimate spatial resolution capability of the scanning tunneling microscope (STM) with the sensitivity to the spin of the tunneling electrons has opened the door to investigations of magnetism at the nanoscale where the fundamental interactions responsible for magnetic order can be studied. Spin-polarized (SP) STM allows insight into a fascinating world with surprisingly rich magnetic phenomena. Ferromagnetic structures with magnetic domains are found at nanometer length scales, or 2D antiferromagnetically ordered monolayers (MLs) where the magnetization is reversed from one atom to the next. Such collinearly ordered states may be modified by the Dzyaloshinsky–Moriya (DM) interaction which can induce a small canting angle between neighboring atomic moments, thus giving rise to novel non-collinear spin spiral ground states. DM interaction is a result of electron scattering in a crystal environment with broken inversion symmetry. Spin spirals were observed in a variety of systems, like ultrathin Fe films, or MLs of Mn atoms on the (110) and (001) faces of a W crystal. Using a magnetically sensitive probe tip, individual Co atoms were assembled to form chains on top of a spin spiral. The magnetization orientation of each individual atom can be manipulated by repositioning it along the spin spiral.

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Rajesh, R. "Electron density distribution influencing the electrical and magnetic properties of polycrystalline Bi_0.9Sm_0.1FeO₃ ceramics". International Journal of Materials Research 113, n.º 4 (1 de marzo de 2022): 278–86. http://dx.doi.org/10.1515/ijmr-2021-8339.

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Abstract This article reports the structural properties that influence the electrical and magnetic behaviours of polycrystalline Bi1−x Sm x FeO3 (x = 0, 0.1) ceramics. The samples are synthesized by a two-step solid state reaction. X-ray diffraction patterns expose two characteristic peaks corresponding to (104) and (110) planes around 31°. Bi1−x Sm x FeO3 (x = 0, 0.1) samples crystalize primarily in the R3c phase along with the traces of secondary phases. The Rietveld refinement analysis reveals that the tilt angle of Bi0.9Sm0.1FeO3 reduces due to the twisting of FeO6 octahedra compared to pristine BiFeO3. The electron density distribution and type of bonding are analyzed using the maximum entropy method. The microstructural analysis reveals that the Bi0.9Sm0.1FeO3 sample has a reduced average particle size compared to pristine BiFeO3. The influence of samarium ions in the bismuth site deviates the canting angle of the modulated spiral spin arrangement and the charge density distribution of the Bi0.9Sm0.1FeO3 sample as a result, the electrical and magnetic behaviours are improved compared with bare BiFeO3.

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Hossain, SM Al Imran, MK Roly y TM Imran Imran. "Crystal Structure Refinement, Magnetic and Mössbauer Analysis of LaFeO3 Perovskite Synthesized by SOL-GEL method". Bangladesh Journal of Physics 27, n.º 2 (10 de marzo de 2022): 27–37. http://dx.doi.org/10.3329/bjphy.v27i2.57664.

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In this present study, LaFeO3 nanoparticles have been successfully synthesized by sol-gel method and annealed the produced sample at 600 °C, 800 °C, 1000 °C, 1200 °C. The influence of annealing temperature on the structural, morphological and magnetic properties of the developed nanoparticles has been investigated systematically. The XRD patterns confirmed the absence of impurity or secondary phase in the spectra. Orthorhombic crystal system of pbnm space group was successfully determined by Rietveld refinement. Scherrer method was used to calculate crystallite size. An increasing trend in crystallite size and improving crystallinity were obtained with increasing annealing temperature. Scanning Electron Microscopy (SEM) images showed a homogeneous distribution of increasing average particle sizes ranging from 35 nm to 450 nm. Magnetic hysteresis (M-H) loop was recorded at room temperature revealed weak ferromagnetism in nanocrystalline lanthanum ferrite. The maximum magnetization was found to be 1.82 emu/g at 600 °C, and it was sharply decreased to 0.33 emu/g at 1200 °C annealing temperature. Interactions between the antiferromagnetic and ferromagnetic exchange coupling are influenced by the uncompensated spin canting causes to accomplish the ordering of weak ferromagnetism in LaFeO3. Moreover, the bond length of Fe-O and the bond angle of Fe-O-Fe were decreased with decreasing annealing temperature. As a result, Fe ions, come closer to each other, enhancing the ferromagnetic exchange interaction between iron ions via oxygen ions made significant contributions to the magnetic properties of LaFeO3 nanoparticles. Mössbauer spectroscopy was used to find the nature of interactions for the observed magnetic behavior depending on different site environments with varying annealing temperatures. Bangladesh Journal of Physics, 27(2), 27-37, December 2020

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Zeng, Ming-Hua, Wei-Xiong Zhang, Xian-Zhong Sun y Xiao-Ming Chen. "Spin Canting and Metamagnetism in a 3D Homometallic Molecular Material Constructed by Interpenetration of Two Kinds of Cobalt(II)-Coordination-Polymer Sheets". Angewandte Chemie 117, n.º 20 (13 de mayo de 2005): 3139–42. http://dx.doi.org/10.1002/ange.200462463.

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Li, J., H. He, F. Lü, Y. Duan y D. Song. "Size-dependence of Magnetic Properties of Bismuth Ferrite Nanopowders". MRS Proceedings 676 (2001). http://dx.doi.org/10.1557/proc-676-y7.7.

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ABSTRACTA series of BiFeO3 nanopowders were prepared by the sol-gel process. X-ray diffraction analysis shows that their rhombohedral crystal symmetry remains unchanged. However, as the particle size decreases, the edge length of the unit cell increases markedly and the angle between the edges deviates increasingly from 60°. Magnetic measurements show obvious weak ferromagnetism. The magnetization and magnetic susceptibility increase with decreasing particle size. Mössbauer studies reveal that the spin canting angles in the smaller particles are bigger and have a wider distribution. The magnetic structure in these particles is a complicated uncompensated antiferromagnetic spin arrangement.

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Bac, S. K., K. Koller, F. Lux, J. Wang, L. Riney, K. Borisiak, W. Powers et al. "Topological response of the anomalous Hall effect in MnBi2Te4 due to magnetic canting". npj Quantum Materials 7, n.º 1 (20 de abril de 2022). http://dx.doi.org/10.1038/s41535-022-00455-5.

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AbstractThree-dimensional (3D) compensated MnBi2Te4 is antiferromagnetic, but undergoes a spin-flop transition at intermediate fields, resulting in a canted phase before saturation. In this work, we experimentally show that the anomalous Hall effect (AHE) in MnBi2Te4 originates from a topological response that is sensitive to the perpendicular magnetic moment and to its canting angle. Synthesis by molecular beam epitaxy allows us to obtain a large-area quasi-3D 24-layer MnBi2Te4 with near-perfect compensation that hosts the phase diagram observed in bulk which we utilize to probe the AHE. This AHE is seen to exhibit an antiferromagnetic response at low magnetic fields, and a clear evolution at intermediate fields through surface and bulk spin-flop transitions into saturation. Throughout this evolution, the AHE is super-linear versus magnetization rather than the expected linear relationship. We reveal that this discrepancy is related to the canting angle, consistent with the symmetry of the crystal. Our findings bring to light a topological anomalous Hall response that can be found in non-collinear ferromagnetic, and antiferromagnetic phases.

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Kumar, Ram, Sudhindra Rayaprol, Sarita Rajput, Tulika Maitra, D. T. Adroja, Kartik K. Iyer, Sanjay K. Upadhyay y E. V. Sampathkumaran. "Existence of a critical canting angle of magnetic moments to induce multiferroicity in the Haldane spin-chain system Tb2BaNiO5". Physical Review B 99, n.º 10 (29 de marzo de 2019). http://dx.doi.org/10.1103/physrevb.99.100406.

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Šepelák, Vladimir, Klebson Lucenildo Da Silva, Rafael Santiago Trautwein, Klaus Dieter Becker y Horst Hahn. "Unusual cation coordination in nanostructured mullites". Zeitschrift für Physikalische Chemie, 3 de septiembre de 2021. http://dx.doi.org/10.1515/zpch-2021-3101.

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Abstract Nanocrystalline mullite-type bismuth-bearing complex oxides Bi2(M0.5Al0.5)4O9 (M=Fe3+, Ga3+) are prepared by high-energy ball milling of the corresponding microcrystalline counterparts. An unusual five-fold coordination of metal cations is revealed in nanostructured Bi2(M0.5Al0.5)4O9 by means of 27Al magic angle spinning nuclear magnetic resonance and 57Fe Mössbauer spectroscopies. The concentration of five-fold coordinated cations increases with decreasing crystallite size of a material at the expense of octahedrally coordinated ones. In addition to the nuclear spectroscopic methods, Rietveld analyses of the X-ray diffraction data of the as-prepared nanooxides show that the constituent tetrahedra, octahedra, and the newly formed structural units with five-fold cation coordination are strongly distorted. With decreasing crystallite size of mullites, the average volume of their octahedra increases whereas this parameter decreases for tetrahedra. The macroscopic behaviour of the non-equilibrium nanomullites is characterised by SQUID magnetometry. The Fe-containing mullites exhibit a superposition of a dominant antiferromagnetism and a weak ferromagnetism. The increase in both the remanent magnetization and the coercive field with decreasing crystallite size is attributed to the effect of spin canting. The latter is confined to the interfacial and surface regions of the nanomaterials, and arises due to both the mechanically induced deformation of constituent structural units and the formation of cation sites with the unusual five-fold coordination.

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"Spin distribution, canting and covalence in (ND 4 ) 2 Cr(SO 4 ) 2 . 6D 2 O by polarized neutron diffraction". Proceedings of the Royal Society of London. Series A: Mathematical and Physical Sciences 436, n.º 1897 (8 de febrero de 1992): 417–26. http://dx.doi.org/10.1098/rspa.1992.0027.

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Polarized neutron diffraction experiments on deuterated ammonium chromous Tutton salt at 1.6 K and 4.6 T, in two orientations of the crystal in the magnetic field, are reported. 216 ( b //H) and 212 ( a //H) data were refined using a model of the magnetization density involving only the spin distribution on the [Cr(OD 2 ) 6 ] 2+ ion, extinction and six canting parameters, three for each data set, to give a goodness-of-fit of 1.4. The canting parameters describe the projection of the total ion spin moment onto the a , b and c * directions. The spin density corresponds closely to a ‘spin hole’ of 1.03(4) spins in the 3d x 3 - y 2 orbital of this Jahn-Teller distorted Cr 2+ ion, with a small but significant contribution from covalence from the coordinated water molecules, and spin polarization of both those molecules and the Cr 11 ion. The two water molecules attached by the long Cr-O(8) bonds behave differently from the four shorter bonded ligands, reflecting their lesser covalence in, respectively, spin occupied and unoccupied Cr 11 3d orbitals. The canting parameters, which correspond to angles of 24° and 29° for the two datasets, and further data on their field and temperature dependencies, are fitted well by a tetragonal crystal field model in which only variation in the spin-orbit coupling constant is important. This quantity has a value 17(5)% greater than for the free Cr 2+ ion. Experiment and theory both confirm that orbital magnetization effects are important only in determining the canting of the magnetic moments and are otherwise small compared with the spin moment in this compound.

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