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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 electronic and magnetic structures of zigzag edge phosphorene nanoribbons (ZPNRs) with various widths were investigated by means of ab initio calculations, by allowing the systems to be spin-polarized.
Abstract: We have investigated, by means of ab initio calculations, the electronic and magnetic structures of zigzag edge phosphorene nanoribbons (ZPNRs) with various widths. The stable magnetic state was found in pristine ZPNRs by allowing the systems to be spin-polarized. The ground state of pristine ZPNRs prefers ferromagnetic order in the same edge but antiferromagnetic order between two opposite edges. The magnetism arises from the dangling bond states as well as edge localized π-orbital states. The presence of a dangling bond is crucial to the formation of the magnetism of ZPNRs. The hydrogenated ZPNRs get nonmagnetic semiconductors with a direct band gap. While, the O-saturated ZPNRs show magnetic ground states due to the weak P-O bond in the ribbon plane between the pz-orbitals of the edge O and P atoms.
100 citations
TL;DR: In this paper, the authors focus on the intermetallic ferromagnetic compound and perform accurate first-principles full-potential linearized augmented plane wave calculations within density functional theory.
Abstract: In the active search for potentially promising candidates for spintronic applications, we focus on the intermetallic ferromagnetic ${\mathrm{Mn}}_{5}{\mathrm{Ge}}_{3}$ compound and perform accurate first-principles full-potential linearized augmented plane wave calculations within density functional theory. Through a careful investigation of the bulk electronic and magnetic structure, our results for the total magnetization, atomic magnetic moments, metallic conducting character, and hyperfine fields are found to be in good agreement with experiments, and are elucidated in terms of a hybridization mechanism and exchange interaction. In order to assess the potential of this compound for spin-injection purposes, we calculate Fermi velocities and degree of spin polarization; our results predict a rather high spin-injection efficiency in the diffusive regime along the hexagonal $c$ axis. Magneto-optical properties, such as ${L}_{2,3}$ x-ray magnetic circular dichroism, are also reported and await comparison with experimental data.
100 citations
TL;DR: In contrast to the closely related AFe2As2 (A = Ca, Sr, Ba, Eu) compounds, no structural distortion is observed in the magnetically ordered state of BaMn2A2.
Abstract: Neutron diffraction measurements have been performed on a powder sample of BaMn2As2 over the temperature T range from 10 K to 675 K. These measurements demonstrate that this compound exhibits collinear antiferromagnetic ordering below the Neel temperature T_N = 625(1) K. The ordered moment mu = 3.88(4) mu_B/Mn at T = 10 K is oriented along the c axis and the magnetic structure is G-type, with all nearest-neighbor Mn moments antiferromagnetically aligned. The value of the ordered moment indicates that the oxidation state of Mn is Mn^{2+} with a high spin S = 5/2. The T dependence of mu suggests that the magnetic transition is second-order in nature. In contrast to the closely related AFe2As2 (A = Ca, Sr, Ba, Eu) compounds, no structural distortion is observed in the magnetically ordered state of BaMn2As2.
100 citations
TL;DR: In this paper, the effect of light diamagnetic doping on the nature of indirect exchange interactions with temperature increase has been discussed, and the light-diamagnetic doping mechanism and magnetic structure model are proposed.
100 citations
TL;DR: In this article, the effects of DMI on the magnetic properties of pyrochlore compounds were investigated through mean field approximation and monte carlo simulations, and it was found that DMI tremendously change the low temperature behavior of the system and a phase transition to a long range ordered state takes place.
Abstract: The Heisenberg nearest neighbour antiferromagnet on the pyrochlore (3D) lattice is highly frustrated and does not order at low temperature where spin-spin correlations remain short ranged. Dzyaloshinsky-Moriya interactions (DMI) may be present in pyrochlore compounds as is shown, and the consequences of such interactions on the magnetic properties are investigated through mean field approximation and monte carlo simulations. It is found that DMI (if present) tremendously change the low temperature behaviour of the system. At a temperature of the order of the DMI a phase transition to a long range ordered state takes place. The ordered magnetic structures are explicited for the different possible DMI which are introduced on the basis of symmetry arguments. The relevance of such a scenario for pyrochlore compounds in which an ordered magnetic structure is observed experimentally is dicussed.
99 citations