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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 article, a structural and magnetic phase diagram of MnNiGe1-xSnx alloys has been proposed and a remarkable magnetic-field-induced paramagnetic/spiral AFM and FM/AFM magnetostructural transformations are found, and large positive and negative magnetocaloric effects are obtained.
Abstract: The martensitic and magnetic phase transformations in MnNiGe1-xSnx (0 ≤ x ≤ 0.200) alloys were investigated using X-ray diffraction, differential thermal analysis, and magnetization measurements. Results indicate that increasing the Sn substitution in MnNiGe1-xSnx results in 1) a decrease of the martensitic transformation temperature from 460 to 100 K and 2) a conversion of spiral antiferromagnetic (AFM) to antiparallel AFM structure in martensite. Based on these features, a remarkable magnetic-field-induced paramagnetic/spiral AFM and FM/AFM magnetostructural transformations are found, and large positive and negative magnetocaloric effects are obtained. The magnetoresponsive effects of MnNiGe1-xSnx alloys are enhanced by Sn substitution. A structural and magnetic phase diagram of MnNiGe1-xSnx alloys has been proposed.
69 citations
TL;DR: In this paper, soft x-ray resonant magnetic diffraction at the Nd $M$ edges was performed on a Nd$M$ epitaxial film to investigate the magnetic ordering of the nd ions below the metal-insulator transition.
Abstract: Soft x-ray resonant magnetic diffraction at the Nd $M$ edges was performed on a $\mathrm{Nd}\mathrm{Ni}{\mathrm{O}}_{3}$ epitaxial film to investigate the magnetic ordering of the Nd ions below the metal-insulator transition. A noncollinear magnetic structure induced by the Ni magnetic moments best describes the azimuthal angle dependency of the $(1∕2,0,1∕2)$ reflection. This confirms the Ni spin structure observed with soft x-ray diffraction experiments performed at the Ni $L$ edge, providing further evidence of charge disproportionation without orbital order below the metal-insulator transition in $\mathrm{Nd}\mathrm{Ni}{\mathrm{O}}_{3}$.
69 citations
TL;DR: The magnetic structure in the ordered phase of the nearly one-dimensional Heisenberg antiferromagnet has been measured using elastic neutron scattering as discussed by the authors, and the results show that at T = 0.3 K the spin ordering is cycloidal with spins rotating in a plane that contains the propagation direction b.
Abstract: The magnetic structure in the ordered phase of the nearly one-dimensional Heisenberg antiferromagnet has been measured using elastic neutron scattering. crystallizes in the orthorhombic Pnma space group with spin chains running along the crystallographic b-direction. Below the ordering temperature the magnetic structure is incommensurate along the chain direction with a temperature-independent ordering wavevector q = (0, 0.472, 0) (rlu}). The occurrence of an incommensurate structure is shown to be the consequence of frustration on the spins induced by the exchange interaction between chains. Group theory is used to determine the possible magnetic structures compatible with the symmetry of the crystal. The results show that at T = 0.3 K the spin ordering is cycloidal with spins rotating in a plane that contains the propagation direction b. A mean-field calculation of the magnetic ground-state energy including exchange anisotropy effects is used to study the stability of the observed structure. Values for the interchain exchange constants that are consistent with the features of the magnetic structure are proposed.
69 citations
TL;DR: In this article, the intermediate and final phases during mechanosynthesis of ZnFe2O4 were studied and a model of particles with a magnetic ordered core coupled to a spin-disordered surface layer was described.
69 citations
TL;DR: The magnetic behavior of eight samples of biotite and a lepidomelane was studied in the temperature range 15-300 K and analyzed in relation to their chemical composition as mentioned in this paper.
Abstract: The magnetic behavior of eight samples of biotite and a lepidomelane was studied in the temperature range 15–300 K and analyzed in relation to their chemical composition The platy morphology of biotite facilitates magnetic measurements with the applied field either in the plane of the sheets (Xe⊥ ) or perpendicular to the plane (Xe∥) At high temperature, the samples obey Curie‐Weiss laws, showing typical paramagnetic behavior which is due to the presence of both Fe2+ and Fe3+ ions However, the susceptibilities are anisotropic (χe⊥/χe∥≂125), because of a trigonal contribution to the crystal field which affects only the ferrous ions Formulae are given which permit the ferrous Curie‐Weiss parameters to be derived from the measured susceptibility At low temperature (T<10 K), three of the biotite samples containing high concentrations of iron (17 to 27 wt %) undergo an antiferromagnetic transition The magnetic structure consists of octahedral sheets of iron ions with their moments ferromagnetically co
69 citations