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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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TL;DR: The model of antiparallel directions of Fe( 3+) and Co(3+) magnetic moments at the shared Wyckoff position describes well the observed neutron diffraction intensities of BiFe (0.8)Co(0.2)O3.
Abstract: Ultra-high-resolution neutron diffraction studies of BiFe0.8Co0.2O3 show a transition from a cycloidal space modulated spin structure at T = 10 K to a collinear G-type antiferromagnetic structure at T = 120 K. The model of antiparallel directions of Fe3+ and Co3+ magnetic moments at the shared Wyckoff position describes well the observed neutron diffraction intensities. On heating above RT, the crystal structure of BiFe0.8Co0.2O3 changes from a rhombohedral R3c to a monoclinic Cm. At 573 K only the Cm phase is present. The collinear C-type antiferromagnetic structure is present in the Cm phase of BiFe0.8Co0.2O3 at RT after annealing.

65 citations

Journal ArticleDOI
TL;DR: In this paper, the Fourier components of the distribution of magnetic moments on the lattice sites of polycrystalline and single-crystal specimens of thulium were made at room temperature to 1.3 deg K.
Abstract: Neutron diffraction studies on polycrystalline and singlecrystal specimens of thulium were made at room temperature to 1.3 deg K. The results are interpreted by a method exhibiting explicitly the Fourier components of the distribution of magnetic moments on the lattice sites. At about 56 deg K, the Neel temperature, a simple oscillating zcomponent-type antiferromagnetic structure is developed. At approximately 40 deg K, nonzero Fourier coefficients of overtones of the fundamental observed at higher teraperatures are first detected. At 4.2 deg K, the magnetic structure of thulium is a type of antiphase domain structure in which several layers of moments parallel to the + a/sub 3/ direction are followed by several layers in which the moments are oppositely directed. The sequence in thulium is --4, +3, --4, +3,... etc. Each atom has, within the precision of the experiments, an ordered moment of 7 mu s, and the ferrimagnetic structure has a net moment, parallel to the c axis, of 1 mu /sub B/ per atom. The fundamental period of the modulation remains constant over the whole range of teraperatures at a value corresponding to 3.5 a/sub 3/ periods. The scattering amplitude of thulium is b/sub Tm/ = (0.69 plus or minusmore » 0.02) x 10/sup -12/ cm. (auth)« less

65 citations

Journal ArticleDOI
TL;DR: In this paper, a review of the recent achievements in the understanding of the magnetic properties of late 3D transition metal antiferromagnetic oxides thin films, interfaces and surfaces is presented.

65 citations

Journal ArticleDOI
TL;DR: In this paper, the relationship between the magnetic structure and ferroelectricity has been studied, where the magnetic order is closely related to the neutron magnetic scattering intensity, indicating that the magnetic orders are closely related with the magnetic strength.
Abstract: Neutron scattering studies and measurements of the dielectric susceptibility e and ferroelectric polarization P have been carried out under various magnetic fields H for single-crystal samples of the multiferroic system LiVCuO 4 with quasi one-dimensional spin 1/2 Cu 2+ chains formed of edge-sharing CuO 4 square planes, and the relationship between the magnetic structure and ferroelectricity has been studied. The ferroelectric polarization is significantly suppressed by the magnetic field H above 2 T applied along the a and b axes. When H = 0, a helical magnetic structure with the helical axis parallel to c has been confirmed. The magnetic structure under the field along a has been determined, where the a b -plane structure changes to the helical one with the helical axis parallel to H with increasing the field through ∼2 T. The ferroelectric polarization along a at H = 0 is found to be proportional to the neutron magnetic scattering intensity, indicating that the magnetic order is closely related to the ...

65 citations

Journal ArticleDOI
TL;DR: In this article, a static model for the long-lived structures over a solar active region dominated by a pair of sunspots of opposite magnetic polarities is presented, where the magnetic field is approximately force-free high in the atmosphere but interacts strongly with the plasma and gravity in the lower region through cross-field electric currents.
Abstract: A static model is presented for the long-lived structures over a solar active region dominated by a pair of sunspots of opposite magnetic polarities. The magnetic field is approximately force-free high in the atmosphere but interacts strongly with the plasma and gravity in the lower region through cross-field electric currents. Basic atmospheric features long discussed in the literature can be reproduced in realistic geometry, such as the density depletion over a sunspot, magnetic shear, and levitated magnetic flux ropes interpretable as chromospheric filaments

65 citations


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