The Library
Temperature dependence of magnetic anisotropy: An ab initio approach
Tools
Staunton, Julie B., Szunyogh, L., Buruzs, A., Gyorffy, B. L., Ostanin, S. and Udvardi, L. (2006) Temperature dependence of magnetic anisotropy: An ab initio approach. PHYSICAL REVIEW B, 74 (14). doi:10.1103/PhysRevB.74.144411 ISSN 1098-0121.
Research output not available from this repository.
Request-a-Copy directly from author or use local Library Get it For Me service.
Official URL: http://dx.doi.org/10.1103/PhysRevB.74.144411
Abstract
We 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 generalization of the disordered local moment theory from which the T dependence of the magnetization, 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(2) 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. We also study a magnetically soft cubic magnet, the Fe50Pt50 solid solution, and find that its small magnetic anisotropy constant K-1 rapidly diminishes from 8 mu eV to zero. K-1 evolves from being proportional to m(7) at low T to m(4) near the Curie temperature. The accounts of both the tetragonal and cubic itinerant electron magnets differ from those extracted from single ion anisotropy models and instead receive clear interpretations in terms of two ion anisotropic exchange.
Item Type: | Journal Article | ||||
---|---|---|---|---|---|
Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | PHYSICAL REVIEW B | ||||
Publisher: | AMERICAN PHYSICAL SOC | ||||
ISSN: | 1098-0121 | ||||
Official Date: | October 2006 | ||||
Dates: |
|
||||
Volume: | 74 | ||||
Number: | 14 | ||||
Number of Pages: | 13 | ||||
DOI: | 10.1103/PhysRevB.74.144411 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |