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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.
[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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[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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