Physics – Condensed Matter – Materials Science
Scientific paper
2004-07-29
Physics
Condensed Matter
Materials Science
4 pages, 2 figures
Scientific paper
10.1103/PhysRevLett.93.257204
On the basis of a first-principles, relativistic electronic structure theory of finite temperature metallic magnetism, we investigate the variation of magnetic anisotropy, K, with magnetisation, M, in metallic ferromagnets. We apply the theory to the high magnetic anisotropy material, L1_0-ordered FePt, and find its uniaxial K consistent with a magnetic easy axis perpendicular to the Fe/Pt layering for all M and to be proportional to M^2 for a broad range of values of M. For small M, near the Curie temperature, the calculations pick out the easy axis for the onset of magnetic order. Our results are in good agreement with recent experimental measurements on this important magnetic material.
Bruno Ezio
Ginatempo Beniamino
Györffy Balazs L.
Ostanin Sergey
Razee S. S. A.
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