Magnetic properties of a Pt/Co2FeAl/MgO structure with perpendicular magnetic anisotropy

doi:10.1088/1674-1056/21/10/107307

中国物理B ›› 2012, Vol. 21 ›› Issue (10): 107307-107307.doi: 10.1088/1674-1056/21/10/107307

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Magnetic properties of a Pt/Co₂FeAl/MgO structure with perpendicular magnetic anisotropy

李晓其, 徐晓光, 王圣, 吴勇, 张德林, 苗军, 姜勇

State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

收稿日期:2012-04-24 修回日期:2012-05-15 出版日期:2012-09-01 发布日期:2012-09-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 50831002, 50971025, 51071022, and 11174031), the National Basic Research Program of China (Grant No. 2012CB932702), the Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT), the Beijing Nova Program (Grant No. 2011031), the Beijing Municipal Natural Science Foundation, China (Grant No. 2102032), and the Fundamental Research Funds for the Central Universities.

Magnetic properties of a Pt/Co₂FeAl/MgO structure with perpendicular magnetic anisotropy

Li Xiao-Qi (李晓其), Xu Xiao-Guang (徐晓光), Wang Sheng (王圣), Wu Yong (吴勇), Zhang De-Lin (张德林), Miao Jun (苗军), Jiang Yong (姜勇)

State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received:2012-04-24 Revised:2012-05-15 Online:2012-09-01 Published:2012-09-01
Contact: Xu Xiao-Guang E-mail:xgxu@ustb.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 50831002, 50971025, 51071022, and 11174031), the National Basic Research Program of China (Grant No. 2012CB932702), the Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT), the Beijing Nova Program (Grant No. 2011031), the Beijing Municipal Natural Science Foundation, China (Grant No. 2102032), and the Fundamental Research Funds for the Central Universities.

摘要/Abstract

摘要： Microstructures and magnetic properties of Ta/Pt/Co₂FeAl (CFA)/MgO multilayers are studied to understand perpendicular magnetic anisotropy (PMA) of half-metallic full-Heusler alloy films. PMA is realized in a 2.5-nm CFA film with B2-ordered structure observed by a high resolution transmission electron microscope. It is demonstrated that a high quality interface between the ferromagnetic layer and oxide layer is not essential for PMA. The conversions between in-plane anisotropy and PMA are investigated to study the dependence of magnetic moment on temperature. At the intersection points, the decreasing slope of the saturation magnetization (M_s) changes because of the conversions. The dependence of M_s on the annealing temperature and MgO thickness is also studied.

关键词: half-metallic, perpendicular magnetic anisotropy

Abstract: Microstructures and magnetic properties of Ta/Pt/Co₂FeAl (CFA)/MgO multilayers are studied to understand perpendicular magnetic anisotropy (PMA) of half-metallic full-Heusler alloy films. PMA is realized in a 2.5-nm CFA film with B2-ordered structure observed by a high resolution transmission electron microscope. It is demonstrated that a high quality interface between the ferromagnetic layer and oxide layer is not essential for PMA. The conversions between in-plane anisotropy and PMA are investigated to study the dependence of magnetic moment on temperature. At the intersection points, the decreasing slope of the saturation magnetization (M_s) changes because of the conversions. The dependence of M_s on the annealing temperature and MgO thickness is also studied.

Key words: half-metallic, perpendicular magnetic anisotropy

中图分类号: (Magnetoresistance)

73.43.Qt

72.25.Ba (Spin polarized transport in metals) 68.35.Ct (Interface structure and roughness)

李晓其, 徐晓光, 王圣, 吴勇, 张德林, 苗军, 姜勇. Magnetic properties of a Pt/Co₂FeAl/MgO structure with perpendicular magnetic anisotropy[J]. 中国物理B, 2012, 21(10): 107307-107307.

Li Xiao-Qi (李晓其), Xu Xiao-Guang (徐晓光), Wang Sheng (王圣), Wu Yong (吴勇), Zhang De-Lin (张德林), Miao Jun (苗军), Jiang Yong (姜勇). Magnetic properties of a Pt/Co₂FeAl/MgO structure with perpendicular magnetic anisotropy[J]. Chin. Phys. B, 2012, 21(10): 107307-107307.

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Magnetic properties of a Pt/Co₂FeAl/MgO structure with perpendicular magnetic anisotropy

Magnetic properties of a Pt/Co₂FeAl/MgO structure with perpendicular magnetic anisotropy

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