Magnetic properties of (Fe1-xCox)2B alloys and the effect of doping by 5d elements

被引:64
作者
Edstroem, A. [1 ]
Werwinski, M. [1 ]
Iusan, D. [1 ]
Rusz, J. [1 ]
Eriksson, O. [1 ]
Skokov, K. P. [2 ]
Radulov, I. A. [2 ]
Ener, S. [2 ]
Kuz'min, M. D. [2 ]
Hong, J. [2 ]
Fries, M. [2 ]
Karpenkov, D. Yu. [2 ]
Gutfleisch, O. [2 ]
Toson, P. [3 ]
Fidler, J. [3 ]
机构
[1] Uppsala Univ, Dept Phys & Astron, Div Mat Theory, SE-75120 Uppsala, Sweden
[2] Tech Univ Darmstadt, Dept Mat Sci, Funct Mat, D-64287 Darmstadt, Germany
[3] Vienna Univ Technol, Inst Solid State Phys, Adv Magnet Grp, A-1040 Vienna, Austria
基金
瑞典研究理事会; 欧洲研究理事会;
关键词
MEAN-FIELD THEORY; MAGNETOCRYSTALLINE ANISOTROPY; BAND-STRUCTURE; SYSTEMS; METALS;
D O I
10.1103/PhysRevB.92.174413
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have explored, computationally and experimentally, the magnetic properties of (Fe1-xCox)(2)B alloys. Calculations provide a good agreement with experiment in terms of the saturation magnetization and the magnetocrystalline anisotropy energy with some difficulty in describing Co2B, for which it is found that both full potential effects and electron correlations treated within dynamical mean field theory are of importance for a correct description. The material exhibits a uniaxial magnetic anisotropy for a range of cobalt concentrations between x = 0.1 and x = 0.5. A simple model for the temperature dependence of magnetic anisotropy suggests that the complicated nonmonotonic behavior is mainly due to variations in the band structure as the exchange splitting is reduced by temperature. Using density functional theory based calculations we have explored the effect of substitutionally doping the transition metal sublattice by the whole range of 5d transition metals and found that doping by Re or W elements should significantly enhance the magnetocrystalline anisotropy energy. Experimentally, W doping did not succeed in enhancing the magnetic anisotropy due to formation of other phases. On the other hand, doping by Ir and Re was successful and resulted in magnetic anisotropies that are in agreement with theoretical predictions. In particular, doping by 2.5 at.% of Re on the Fe/Co site shows a magnetocrystalline anisotropy energy which is increased by 50% compared to its parent (Fe0.7Co0.3)(2)B compound, making this system interesting, for example, in the context of permanent magnet replacement materials or in other areas where a large magnetic anisotropy is of importance.
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页数:13
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