An ab-initio theory for the temperature dependence of magnetic anisotropy

Simple item page
dc.creatorStaunton, J. B.
dc.creatorSzunyogh, L.
dc.creatorBuruzs, A.
dc.creatorGyorffy, B. L.
dc.creatorOstanin, S.
dc.creatorUdvardi, L.
dc.date2006-06-08
dc.date.accessioned2026-07-07T07:12:32Z
dc.date.available2026-07-07T07:12:32Z
dc.descriptionWe present a first-principles theory of the variation of magnetic anisotropy, K, with temperature, T, in metallic ferromagnets. It is based on relativistic electronic structure theory and calculation of magnetic torque. Thermally induced `local moment' magnetic fluctuations are described within the relativistic generalisation of the `disordered local moment' (R-DLM) theory from which the T dependence of the magnetisation, m, is found. We apply the theory to a uniaxial magnetic material with tetragonal crystal symmetry, L1_0-ordered FePd, and find its uniaxial K consistent with a magnetic easy axis perpendicular to the Fe/Pd layers for all m and proportional to m squared for a broad range of values of m. This is the same trend that we have previously found in L1_0-ordered FePt and which agrees with experiment. This account, however, differs qualitatively from that extracted from a single ion anisotropy model. We also study the magnetically soft cubic magnet, the Fe(50)Pt(50) solid solution, and find that its small magnetic anisotropy constant K_1 rapidly diminishes from 8 micro-eV to zero. K evolves from being proportional to the seventh power of m at low T to the fourth power near the Curie temperature.
dc.description31 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0606219
dc.identifierhttp://arxiv.org/abs/cond-mat/0606219
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/112107
dc.subjectMaterials Science
dc.titleAn ab-initio theory for the temperature dependence of magnetic anisotropy
dc.typetext

Files

Collections

arXiv