Paper Abstract and Keywords |
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.) MR2015-3 Link to ES Tech. Rep. Archives: MR2015-3 |
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 / / / / / / |
Reference Info. |
IEICE Tech. Rep., vol. 115, June 2015. |
Paper # |
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Date of Issue |
2015-05-28 (MR) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
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MR2015-3 Link to ES Tech. Rep. Archives: MR2015-3 |
Conference Information |
Committee |
MRIS ITE-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) |
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Recording Systems, etc. |
Paper Information |
Registration To |
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 |
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Crystalline magnetic anisotropy |
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First-principles calculation |
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1st Author's Name |
Naofumi Kobayashi |
1st Author's Affiliation |
Tohoku University (Tohoku Univ.) |
2nd Author's Name |
Kazushige Hyodo |
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Tohoku University (Tohoku Univ.) |
3rd Author's Name |
Akimasa Sakuma |
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Tohoku University (Tohoku Univ.) |
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Speaker |
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Date Time |
2015-06-04 14:40:00 |
Presentation Time |
25 minutes |
Registration for |
MRIS |
Paper # |
MR2015-3 |
Volume (vol) |
vol.115 |
Number (no) |
no.71 |
Page |
pp.13-16 |
#Pages |
4 |
Date of Issue |
2015-05-28 (MR) |