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Presentation 2015-06-04 14:40
First principles study for the effect of spin fluctuation on the crystalline magnetic anisotropy in L10-type ordered alloys
Naofumi Kobayashi, Kazushige Hyodo, Akimasa Sakuma (Tohoku Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) For the application of high-density magnetic devices, thermal stability of magnetization in materials is one of the key factors.
In this study, we investigated the influence of the spin fluctuation at finite temperature on the uniaxial magnetic anisotropy constant ($K_{rm u}$) on $rm L1_0$-type ordered alloys, such as FePt and CoPt. In our calculation, we restricted directions of the magnetic moment in each site to two directions, and the thermal spin fluctuation was expressed as the random substitution ratio $X$ in (Fe$_{uparrow}$)$_{1-X}$(Fe$_{uparrow}$)$_{1-X}$Pt. We employed the tight-binding linear muffin-tin orbital (TB-LMTO) method within the local spin density functional theory.The disordered magnetization was taken into account by using coherent potential approximation (CPA).
The result showed the relationship between $K_{rm u}$ and $<M>$ as a function of $X$. We found that $K_{rm u}$ is proportional to n-th power of $<M>$($napprox2$) in both FePt and CoPt. This trend is similar to that of the experimental result. We conclude that the behavior of $K_{rm u}$ of these alloys at finite temperature is well explained by a simple assumption of the Ising type fluctuation for the thermal excitation.
Keyword (in Japanese) (See Japanese page) 
(in English) Crystalline magnetic anisotropy / First-principles calculation / / / / / /  
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Conference Information
Committee IEICE-MRIS MMS  
Conference Date 2015-06-04 - 2015-06-05 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Recording Systems, etc. 
Paper Information
Registration To IEICE-MRIS 
Conference Code 2015-06-MR-MMS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) First principles study for the effect of spin fluctuation on the crystalline magnetic anisotropy in L10-type ordered alloys 
Sub Title (in English)  
Keyword(1) Crystalline magnetic anisotropy  
Keyword(2) First-principles calculation  
1st Author's Name Naofumi Kobayashi  
1st Author's Affiliation Tohoku University (Tohoku Univ.)
2nd Author's Name Kazushige Hyodo  
2nd Author's Affiliation Tohoku University (Tohoku Univ.)
3rd Author's Name Akimasa Sakuma  
3rd Author's Affiliation Tohoku University (Tohoku Univ.)
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Speaker Author-1 
Date Time 2015-06-04 14:40:00 
Presentation Time 25 minutes 
Registration for IEICE-MRIS 
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Volume (vol) vol.39 
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