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Magnetic structure

About: Magnetic structure is a research topic. Over the lifetime, 10787 publications have been published within this topic receiving 207143 citations.


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Journal ArticleDOI
27 Jul 2016
TL;DR: In this paper, the authors review neutron measurements of prototypical examples of these different approaches to achieving multiferrocity in TbMnO3 and compare them with single-phase multiferroics.
Abstract: Multiferroics are materials that evince both ferroelectric and magnetic order parameters. These order parameters when coupled can lead to both exciting new physics as well as new device applications. Potential device applications include memory, magnetic field sensors, small antennas and so on. Since Kimura’s discovery of multiferroicity in TbMnO3, there has been a renaissance in the study of these materials. Great progress has been made in both materials discovery and in the theoretical understanding of these materials. In type-II systems the magnetic order breaks the inversion symmetry of the material, driving a secondary ferroelectric phase transition in which the ferroelectric polarisation is exquisitely coupled to the magnetic structure and thus to magnetic field. In type-I systems, the magnetic and ferroelectric orders are established on different sublattices of the material and typically are weakly coupled, but electric field can still drive changes in the magnetisation. Besides single-phase multiferroics, there has been exciting progress in composite heterostructures of multiferroics. Here, we review neutron measurements of prototypical examples of these different approaches to achieving multiferrocity.

53 citations

Journal ArticleDOI
TL;DR: In this paper, an investigation on amorphous ferrites using antiferromagnetic oxides as starting materials instead of ferrimagnetic oxide was carried out and the results showed that (CaO)20− (Bi2O3)15(Fe2O 3)65 glass has magnetization value of 13.2emu/g at room temperature in applied magnetic field of 10 kOe.
Abstract: Investigation on amorphous ferrite CaO-Bi2O3-Fe2O3 system has been carried out. This is one of new types of amorphous ferrites using antiferromagnetic oxides as starting materials instead of ferrimagnetic oxides. In some compositions ferromagnetic behaviors were observed. Especially, (CaO)20− (Bi2O3)15(Fe2O3)65 glass has magnetization value of 13.2emu/g at room temperature in applied magnetic field of 10 kOe. This value can not be obtained by any pure crystalline calcium ferrite. Mossbauer absorption spectra were measured to clarify the magnetic structure of the glass.

53 citations

Journal ArticleDOI
TL;DR: It is shown that all structural transformations at pressures <7 GPa are driven by spin interactions; therefore, high-pressure oxygen should be considered as a unique "spin-controlled crystal."
Abstract: Simple diatomic molecules exhibit a variety of exciting physical phenomena under high pressures, including structural transitions, pressure induced metallization, and superconductivity. Oxygen is of particular interest because it carries a magnetic moment. For the first time we studied the magnetic structure in solid oxygen under very high pressure by a direct method, namely, neutron diffraction. A new type of magnetic order with ferromagnetic stacking of the antiferromagnetic O2 planes was discovered in delta-O2 at P=6.2 GPa. We show that all structural transformations at pressures <7 GPa are driven by spin interactions; therefore, high-pressure oxygen should be considered as a unique "spin-controlled crystal."

53 citations

Journal ArticleDOI
TL;DR: In this article, the structure and magnetic properties of Bi 2 CuO 4 have been studied by neutron and X-ray diffraction, magnetic susceptibility and magnetization measurements, and three-dimensional (3D) and anisotropic antiferromagnetism is revealed for this compound rather than the previously anticipated one dimensional one.
Abstract: The structure and magnetic properties of Bi 2 CuO 4 have been studied by neutron and X-ray diffraction, magnetic susceptibility and magnetization measurements. Three-dimensional (3D) and anisotropic antiferromagnetism is revealed for this compound rather than the previously anticipated one-dimensional one. Long-range antiferromagnetic order associated with a ferromagnetic stacking of Cu 2+ spins along the [001] axis starts to develop below T N =42 K. A magnetic moment of 0.85±0.05 µ B /Cu which is larger than those of Cu 2+ spins in the two-dimensional Heisenberg antiferromagnets such as La 2 CuO 4 and Sr 2 CuCl 2 O 2 reflects the 3D character in Bi 2 CuO 4 . A non-linear magnetization curve under an inplane magnetic field is analyzed quantitatively by a continuous spin rotation in the (001) plane.

53 citations

Journal ArticleDOI
TL;DR: In this article, the contribution to magnetostriction of the various anisotropic parameters (RE-iron exchange, crystal field acting on RE, spin-orbit coupling) is analyzed.

53 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202353
202296
2021187
2020224
2019247
2018229