Novel torque magnetometry for uniaxial anisotropy constants of thin films and its application to FePt granular thin films

被引：17
|
作者：
Ono, Takuya [1 ,2 ]
Kikuchi, Nobuaki [3 ,4 ]
Okamoto, Satoshi [3 ,4 ]
Kitakami, Osamu [3 ,4 ]
Shimatsu, Takehito [2 ,4 ,5 ]
机构：
[1] Fuji Elect Co Ltd, Hino, Tokyo 1918502, Japan
[2] Tohoku Univ, Frontier Res Inst Interdisciplinary Sci FRIS, Sendai, Miyagi 9808578, Japan
[3] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan
[4] Tohoku Univ, Ctr Spintron Res Network, Sendai, Miyagi 9808577, Japan
[5] Tohoku Univ, Res Inst Elect Commun, Sendai, Miyagi 9808577, Japan
来源：
APPLIED PHYSICS EXPRESS | 2018年 / 11卷 / 03期
关键词：
MAGNETIC-ANISOTROPY; ELECTRODES;
D O I：
10.7567/APEX.11.033002
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A technique based on torque magnetometry is proposed for precise determination of the uniaxial magnetic anisotropy constant, K-u, of perpendicularly magnetized thin films, in particular for K-u larger than 10(6) J/m(3), by electrical detection of the anomalous Hall effect and exact determination of the magnetic field direction. This technique can measure the K-u value of several-nanometer-thick polycrystalline films. Further, the K-u value of FePt-C granular films, which are expected to be useful for high-density magnetic recording media, is evaluated. The intrinsic K-u value of 4-nm-thick FePt-C thin films fabricated at 450 degrees C is approximately 3 MJ/m(3) for carbon contents up to 34 vol% C. (C) 2018 The Japan Society of Applied Physics
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页数：3
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