Magnetic anisotropy of FePt: Effect of lattice distortion and chemical disorder

被引：26

作者：

Aas, C. J. ^{[1
]}

Szunyogh, L. ^{[2
]}

Chen, J. S. ^{[3
]}

Chantrell, R. W. ^{[1
]}

机构：

[1] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

[2] Budapest Univ Technol & Econ, Dept Theoret Phys, H-1111 Budapest, Hungary

[3] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117576, Singapore

来源：

APPLIED PHYSICS LETTERS | 2011年 / 99卷 / 13期

基金：

英国工程与自然科学研究理事会;

关键词：

ab initio calculations; ferromagnetic materials; iron alloys; magnetic anisotropy; platinum alloys; spin fluctuations; POTENTIAL MODEL; ALLOYS;

D O I：

10.1063/1.3644478

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We perform first principles calculations of the magnetocrystalline anisotropy energy (MAE) in the five samples of L1(0) FePt that were studied experimentally by Ding and co-workers [J. Appl. Phys. 97, 10H303 (2005)]. The effect of temperature-induced spin fluctuations is estimated by scaling the MAE down according to previous Langevin dynamics simulations. Including chemical disorder as given in experiment, the experimental correlation between the MAE and the lattice mismatch is qualitatively well reproduced. Moreover, we determine the chemical order parameters that reproduce exactly the experimental MAE of each of the samples. Our observations lead to the conclusion that the MAE of the FePt samples is determined by the chemical disorder rather than by lattice distortion. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3644478]

引用

页数：3

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