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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: In this paper, the ternary silicides RFeSi (R�La-Sm, Gd-Dy) with the tetragonal CeFeSi-type structure (space group, P4/nmm) were investigated by susceptibility measurements and neutron diffraction experiments.

104 citations

Journal ArticleDOI
TL;DR: In this article, the Monte Carlo simulations for the Ising spin tiangular lattice antiferromagnet were used to reproduce the observed successive transition in the case of the exchange parameters 4 J 3 <2 J 2 ∼ J 1 <0.
Abstract: Magnetic ordering in a rhombohedrally stacked triangular lattice antiferromagnet, CuFeO 2 was investigated on powder and single crystals by measurements of neutron diffraction, magnetic susceptibility, Mossbauer effect together with Monte Carlo simulations. CuFeO 2 was found to exhibit transitions at T N1 =16±0.5 K and T N2 =11±0.5 K. The low temperature phase has an orthorhombic magnetic unit cell with collinear moments along the c -axis, whereas the intermediate temperature phase is a partially disordered phase with a monoclinic magnetic unit cell where 1/5 of moments remain paramagnetic. The Monte Carlo simulations for the Ising spin tiangular lattice antiferromagnet can reproduce the observed successive transition in the case of the exchange parameters 4 J 3 <2 J 2 ∼ J 1 <0. This combination of exchange parameters gives an account for the stability of the collinear magnetic structure in CuFeO 2 .

104 citations

Journal ArticleDOI
TL;DR: In this paper, the electronic structure of ordered and disordered Sr2FeMoO6 was investigated using ab initio bandstructure methods and the effect of disorder was simulated within supercell calculations to realize several configurations with mis-site disorders.
Abstract: We have investigated the electronic structure of ordered and disordered Sr2FeMoO6 using ab initio bandstructure methods The effect of disorder was simulated within supercell calculations to realize several configurations with mis-site disorders It is found that such disorder effects destroy the half-metallic ferromagnetic state of the ordered compound It also leads to a substantial reduction of the magnetic moments at the Fe sites in the disordered configurations Most interestingly, it is found for the disordered configurations that the magnetic coupling within the Fe sublattice as well as that within the Mo sublattice always remain ferromagnetic, while the two sublattices couple antiferromagnetically, in close analogy to the magnetic structure of the ordered compound, but,in contrast to recent suggestions

103 citations

Journal ArticleDOI
TL;DR: In this paper, the magnetic and structural properties of epitaxial metal organic chemical vapor deposition grown p-GaN:Mg/Al2O3 implanted with Co, Cr, and V ions at varying high doses at 350°C were investigated after a short anneal at 700 °C to remove implantation damage.
Abstract: We report on the magnetic and structural properties of epitaxial metal organic chemical vapor deposition grown p-GaN:Mg/Al2O3 implanted with Co, Cr, and V ions at varying high doses at 350 °C. Magnetic and structural properties were investigated after a short anneal at 700 °C to remove implantation damage. Magnetic properties determined from superconducting quantum interference device magnetometer measurements indicate ferromagnetic-like ordering for Co and Cr doped samples up to 320 K, while V doped samples show paramagnetic behavior for all temperatures considered. For all samples studied, structural characterization techniques such as x-ray diffraction, high-resolution cross-sectional transmission electron microscopy, and selected area diffraction pattern, indicate no second phases that may contribute to the magnetic properties measured. Transport measurements (resistivity as a function of temperature) reveal all samples to show insulating-like behavior.

103 citations

Journal ArticleDOI
TL;DR: The spatial distribution of magnetisation density in the intermetallic compound Mn5Ge3 has been determined from a polarised neutron diffraction single-crystal study at 4.2 K.
Abstract: The spatial distribution of magnetisation density in the intermetallic compound Mn5Ge3 has been determined from a polarised neutron diffraction single-crystal study at 4.2 K. The positional and thermal parameters of the structure were derived from an unpolarised neutron study at 60 K, which also served to characterise the extinction in the material. The observed magnetic structure factors were fitted by a multipole expansion based on free-atom form factors for each of the two crystallographically inequivalent manganese atoms in the unit cell. The magnetic moment of the Mn1 atom with site symmetry 32 is 1.96(3) mu B and that of Mn2 with site symmetry mm is 3.23(2) mu B. The radial form factor of the Mn1 atom is found to be significantly contracted relative to that of a free Mn2+ ion. Evidence is presented that Mn-Mn interactions are the major factor leading to the difference in the moments on the two sites.

103 citations


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