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The perpendicular magnetic anisotropy (PMA) of the CoFeB/AlOx/Ta structure and the AlOx/CoFeB/Ta structure with different thicknesses of both CoFeB and AlOx is studied. Magnetization curves show that the CoFeB/AlOx/Ta structure has a clear perpendicular magnetic easy axis while the AlOx/CoFeB/Ta structure does not. The cause of the asymmetrical phenomenon in the symmetric structures is analyzed. Dependence of the perpendicular coercivities on the thicknesses of CoFeB and AlOx shows that both of them can affect the strength of the PMA originating from the interfacial interaction. This work will be meaningful for the fabrication of the AlOx-based perpendicular magnetic tunnel junctions.
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Keywords:
- perpendicular magnetic anisotropy /
- magnetic tunnel junctions /
- magnetic random access memory
[1] Mangin S, Ravelosona D, Katine J A, Carey M J, Terris B D, Eric E F 2006 Nature Mater. 5 210
[2] Meng H, Wang J P 2006 Appl. Phys. Lett. 88 172506
[3] Kou S P, Lu R, Liang J Q 2003 Chin. Phys. Lett. 19 1525
[4] Kim G, Sakuraba Y, Oogane M, Ando Y, Miyazaki T 2008 Appl. Phys. Lett. 92 172502
[5] Ding Y, Judy J H, Wang J P 2005 J. Appl. Phys. 97 10J117
[6] Nishimura N, Hirai T, Koganei A, Ikeda T, Okano K, Sekiguchi Y, Osada Y 2002 J. Appl. Phys. 91 5246
[7] Mizunuma K, Ikeda S, Park J H, Yamamoto H, Gan H D, Miura K, Hasegawa H, Hayakawa J, Matsukura F, Ohno H 2009 Appl. Phys. Lett. 95 232516
[8] Ikeda S, Miura K, Yamamoto H, Mizunuma K, Gan H D, Endo M, Kanai S, Hayakawa J, Matsukura F, Ohno H 2010 Nature Mater. 9 721
[9] Wang W X, Yang Y, Naganuma H, Ando Y, Yu R C, Han X F 2011 Appl. Phys. Lett. 99 012502
[10] Worledge D C, Hu G, Abraham D W, Sun J Z, Trouilloud P L, Nowak J, Brown S, Gaidis M C, O'Sullivan E J, Robertazzi R P 2011 Appl. Phys. Lett. 98 022501
[11] Cheng C W, Feng W, Chern G, Lee C M, Wu T 2011 J. Appl. Phys. 110 033916
[12] Chen Y T, Wu J W 2011 J. Alloy. Compd. 509 9246
[13] Yamanouchi M, Koizumi R, Ikeda S, Sato H, Mizunuma K, Miura K, Gan H D, Matsukura F, Ohno H 2011 J. Appl. Phys. 109 07C712
[14] Spoddig D, Köhler U, Haak M, Kneppe M, Schmitte T, Westphalen A, Theis-Bröhl K, Meckenstock R, You D, Pelzl J 2008 Superlattices Microstruct. 43 180
[15] Hirose Y, Hitosugi T, Kasai J, Furubayashi Y, Nakajima K, Chikyow T, Konuma S, Shimada T, Hasegawa T 2010 Appl. Phys. Lett. 96 042503
[16] Liu N, Wang H, Zhu T 2012 Acta Phys. Sin. 61 167594 (in Chinese) [刘娜, 王海, 朱涛 2012 61 167594]
[17] Ma Q L 2011 Ph. D. Dissertation (Beijing: Graduate University of Chinese Academy of Sciences) (in Chinese) [马勤礼 2011 博士学位论文(北京: 中国科学院研究生院)
[18] Endo M, Kanai S, Ikeda S, Matsukura F, Ohno H 2010 Appl. Phys. Lett. 96 212503
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[1] Mangin S, Ravelosona D, Katine J A, Carey M J, Terris B D, Eric E F 2006 Nature Mater. 5 210
[2] Meng H, Wang J P 2006 Appl. Phys. Lett. 88 172506
[3] Kou S P, Lu R, Liang J Q 2003 Chin. Phys. Lett. 19 1525
[4] Kim G, Sakuraba Y, Oogane M, Ando Y, Miyazaki T 2008 Appl. Phys. Lett. 92 172502
[5] Ding Y, Judy J H, Wang J P 2005 J. Appl. Phys. 97 10J117
[6] Nishimura N, Hirai T, Koganei A, Ikeda T, Okano K, Sekiguchi Y, Osada Y 2002 J. Appl. Phys. 91 5246
[7] Mizunuma K, Ikeda S, Park J H, Yamamoto H, Gan H D, Miura K, Hasegawa H, Hayakawa J, Matsukura F, Ohno H 2009 Appl. Phys. Lett. 95 232516
[8] Ikeda S, Miura K, Yamamoto H, Mizunuma K, Gan H D, Endo M, Kanai S, Hayakawa J, Matsukura F, Ohno H 2010 Nature Mater. 9 721
[9] Wang W X, Yang Y, Naganuma H, Ando Y, Yu R C, Han X F 2011 Appl. Phys. Lett. 99 012502
[10] Worledge D C, Hu G, Abraham D W, Sun J Z, Trouilloud P L, Nowak J, Brown S, Gaidis M C, O'Sullivan E J, Robertazzi R P 2011 Appl. Phys. Lett. 98 022501
[11] Cheng C W, Feng W, Chern G, Lee C M, Wu T 2011 J. Appl. Phys. 110 033916
[12] Chen Y T, Wu J W 2011 J. Alloy. Compd. 509 9246
[13] Yamanouchi M, Koizumi R, Ikeda S, Sato H, Mizunuma K, Miura K, Gan H D, Matsukura F, Ohno H 2011 J. Appl. Phys. 109 07C712
[14] Spoddig D, Köhler U, Haak M, Kneppe M, Schmitte T, Westphalen A, Theis-Bröhl K, Meckenstock R, You D, Pelzl J 2008 Superlattices Microstruct. 43 180
[15] Hirose Y, Hitosugi T, Kasai J, Furubayashi Y, Nakajima K, Chikyow T, Konuma S, Shimada T, Hasegawa T 2010 Appl. Phys. Lett. 96 042503
[16] Liu N, Wang H, Zhu T 2012 Acta Phys. Sin. 61 167594 (in Chinese) [刘娜, 王海, 朱涛 2012 61 167594]
[17] Ma Q L 2011 Ph. D. Dissertation (Beijing: Graduate University of Chinese Academy of Sciences) (in Chinese) [马勤礼 2011 博士学位论文(北京: 中国科学院研究生院)
[18] Endo M, Kanai S, Ikeda S, Matsukura F, Ohno H 2010 Appl. Phys. Lett. 96 212503
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