CoFeB/Pt多层膜的垂直磁各向异性研究

刘娜; 王海; 朱涛

doi:10.7498/aps.61.167504

摘要

具有垂直磁各向异性的磁性纳米结构是自旋转移力矩器件的重要研究内容, 本文采用反常霍尔效应系统地研究了磁控溅射法制备的[CoFeB/Pt]n多层膜的垂直磁各向异性. 当CoFeB的厚度小于0.6 nm时, 可以在[CoFeB/Pt]n多层膜中观察到清晰的垂直磁各向异性, 其垂直磁各向异性强烈依赖于CoFeB和Pt层厚度及多层膜周期数. 当多层膜周期数n ≥ 5时, 出现零剩磁现象. 另外, [CoFeB/Pt]n多层膜的矫顽力均小于2 kA·m-1, 有望作为垂直自由层的重要侯选材料应用于垂直磁纳米结构中.

关键词:

Abstract

The perpendicular magnetic anisotropy (PMA) in as-deposited [CoFeB/Pt]n multilayer is studied by using anomalous Hall effect. A clear PMA is observed in the ultrathin (～ 0.5 nm) amorphous CoFeB layer sandwiched by Pt. The PMA in as-deposited [CoFeB/Pt]n multilayers is strongly dependent on the thicknesses of CoFeB, Pt, and the number of CoFeB/Pt bilayers. With the increase of the number of CoFeB/Pt bilayers (n ≥ 5), the hysteresis loop changes from rectangular to bow-tie shaped, and then the net moment approaches to zero in the remnant state. Moreover, the coercivty of [CoFeB/Pt]n multilayers is much low, which meets the requirement for free perpendicular electrode in the future spintronic device.

Keywords:

作者及机构信息

1.
首都师范大学物理系, 北京 100048;

2.
中国科学院物理研究所, 磁学国家重点实验室, 北京 100190

基金项目: 国家自然科学基金(批准号: 50871120, 11079052, 11174354)资助的课题.

Authors and contacts

1.
Department of Physics, Capital Normal University, Beijing 100048, China;

2.
State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 50871120, 11079052, 11174354).

参考文献

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[2]	Yoo I, Kim D K, Kim Y K 2005 J. Appl. Phys. 97 10C919
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[4]	Liu L, Moriyama T, Ralph D C, Buhrman R A 2009 Appl. Phys. Lett. 94 122508
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[9]	Fowley C, Decorde N, Oguz K, Rode K, Kurt H, Coey J M D 2010 IEEE Magn. 46 2116
[10]	Chien C L, Westgate C R 1980 The Hall Effect and Its Application (1st Ed.) (New York: Plenum) p55
[11]	Ding Y, Judy J H, Wang J P 2005 J. Appl. Phys. 97 10J117
[12]	Zhai Z H, Teng J, Li B H, Wang L J, Yu G H, Zhu F W 2006 Acta Phys. Sin. 55 2064 (in Chinese) [翟中海, 滕蛟, 李宝河, 王立锦, 于广华, 朱逢吾 2006 物理学报 55 2064]
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施引文献

[1]	Carvello B, Ducruet C, Rodmacq B, Auffret S, Gautier E, Gaudin G, Dieny B 2009 Appl. Phys. Lett. 92 102508
[2]	Yoo I, Kim D K, Kim Y K 2005 J. Appl. Phys. 97 10C919
[3]	Nakayama M, Kai T, Shimomura N, Amano M, Kitagawa E, Nagase T, Yoshikawa M, Kishi T, Ikegawa S, Yoda H 2008 J. Appl. Phys. 103 07A710
[4]	Liu L, Moriyama T, Ralph D C, Buhrman R A 2009 Appl. Phys. Lett. 94 122508
[5]	Wei D H, Chou S C, Chin T S, Yu C C, Liou Y, Yao Y D 2005 J. Appl. Phys. 97 10N120
[6]	Wang H, Zhou Y S, Wang A L, Zheng W, Chen J C 1999 Acta Phys. Sin. 48 S151 (in Chinese) [王海, 周云松, 王艾玲, 郑鹉, 陈金昌 1999 物理学报 48 S151]
[7]	Feng C, Zhan Q, Li B H, Teng J, Li M H, Jiang Y, Yu G H 2009 Acta Phys. Sin. 58 3503 (in Chinese) [冯春, 詹倩, 李宝河, 滕蛟, 李明华, 姜勇, 于广华 2009 物理学报 58 3503]
[8]	Jung J H, Lim S H, Lee S R 2010 Appl. Phys. Lett. 96 042503
[9]	Fowley C, Decorde N, Oguz K, Rode K, Kurt H, Coey J M D 2010 IEEE Magn. 46 2116
[10]	Chien C L, Westgate C R 1980 The Hall Effect and Its Application (1st Ed.) (New York: Plenum) p55
[11]	Ding Y, Judy J H, Wang J P 2005 J. Appl. Phys. 97 10J117
[12]	Zhai Z H, Teng J, Li B H, Wang L J, Yu G H, Zhu F W 2006 Acta Phys. Sin. 55 2064 (in Chinese) [翟中海, 滕蛟, 李宝河, 王立锦, 于广华, 朱逢吾 2006 物理学报 55 2064]
[13]	Fu Y Q, Liu Y, Jin C, Yu G H 2009 Acta Phys. Sin. 58 7977 (in Chinese) [付艳强, 刘洋, 金川, 于广华 2009 物理学报 58 7977]
[14]	Sang H, Chien C L, Yang F Y 2006 J. Appl. Phys. 99 013906

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