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Chin. Phys. B, 2012, Vol. 21(10): 107307    DOI: 10.1088/1674-1056/21/10/107307
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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
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 (Ms) changes because of the conversions. The dependence of Ms on the annealing temperature and MgO thickness is also studied.
Keywords:  half-metallic      perpendicular magnetic anisotropy  
Received:  24 April 2012      Revised:  15 May 2012      Accepted manuscript online: 
PACS:  73.43.Qt (Magnetoresistance)  
  72.25.Ba (Spin polarized transport in metals)  
  68.35.Ct (Interface structure and roughness)  
Fund: 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.
Corresponding Authors:  Xu Xiao-Guang     E-mail:  xgxu@ustb.edu.cn

Cite this article: 

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 2012 Chin. Phys. B 21 107307

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