Topic
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, the crystal and magnetic structures of the magnetoelectric materials RMn2O5 (R=Tb,Ho,Dy) using neutron diffraction as a function of temperature were studied.
Abstract: We have studied the crystal and magnetic structures of the magnetoelectric materials RMn2O5 (R=Tb,Ho,Dy) using neutron diffraction as a function of temperature. All three materials display incommensurate antiferromagnetic ordering below 40 K, becoming commensurate on further cooling. For R=Tb,Ho, a commensurate-incommensurate transition takes place at low temperatures. The commensurate magnetic structures have been solved and are discussed in terms of competing exchange interactions. The spin configuration within the ab plane is essentially the same for each system, and the radius of R determines the sign of the magnetic exchange between adjacent planes. The inherent magnetic frustration in these materials is lifted by a small lattice distortion, primarily involving shifts of the Mn3+ cations and giving rise to a canted antiferroelectric phase.
208 citations
TL;DR: In this article, the authors discussed the domain structure in ultrathin magnetic films, where the easy direction of magnetization is perpendicular to the film, and calculated the dependence of the width D of domains on film thickness L within the continuum approximation.
203 citations
TL;DR: A second-variation full-potential linear augmented-plane-wave total-energy method for thin-film ferromagnetic systems is used to study the spin-orbit-interaction contribution to the magnetic anisotropy.
Abstract: A second-variation full-potential linear augmented-plane-wave total-energy method for thin-film ferromagnetic systems is used to study the spin-orbit-interaction contribution to the magnetic anisotropy. For a free-standing Fe monolayer, the spin magnetization is determined to lie in the plane. Results for Fe monolayers on Au(001), Ag(001), and Pd(001) substrates indicate a preference for the spin direction to be perpendicular to the plane of the film. Computational details for this magnetic anisotropy are also discussed.
202 citations
TL;DR: In this article, the magnetic structures of substituted ferrites are reviewed, focusing on the more usual case of a local canted state, and experimental phase diagrams (tetrahedral-octahedral iron concentrations) are established to distinguish between different magnetic regions.
Abstract: In this paper the magnetic structures of various substituted ferrites are reviewed. Attention is focused on the more usual case of a local canted state. Several systems and detailed magnetic experiments are listed and discussed. Then experimental phase diagrams (tetrahedral-octahedral iron concentrations) are established to distinguish between different magnetic regions: ferrimagnetic order, local canted state or perturbed magnetic order, spin-glass-like phase and in between intermediate regions.
201 citations
TL;DR: In this article, the transformation of a spatially spin-modulated magnetic structure in BiO3 into an ordinary spatially uniform structure of the LaFeO3 orthoferrite in Bi1−xLaxFeO 3 solid solutions is studied.
Abstract: By analyzing the NMR line shape, the transformation of a spatially spin-modulated magnetic structure in BiFeO3 into an ordinary spatially uniform structure of the LaFeO3 orthoferrite in Bi1−x
LaxFeO3 solid solutions is studied. The measurements are made using a spin-echo technique at temperatures of 77 and 4.2 K on ceramics with compositions x=0, 0.1, 0.2, 0.61, 0.9, and 1.0 enriched by the 57Fe isotope. It is shown that the spin-modulated structure disappears near the concentration x=0.2, which corresponds, according to the published data, to the phase transition with a change in the unit-cell symmetry R3c → C222. A formula is obtained describing the NMR absorption line shape for the spin-modulated structure with account of local line-width. Theoretical spectra adequately describe the evolution of the experimental spectrum in the concentration range 0≤x≤0.2. Highly nonuniform local magnetic fields in the intermediate compositions make it impossible to detect NMR signals in a sample with x=0.61. A uniform magnetic structure characterized by a single narrow line arises in the range of existence of a phase with the symmetry Pnma typical of the pure orthoferrite LaFeO3.
201 citations