Pt插层对铁磁/反铁磁界面交换耦合的影响

王一军; 刘洋; 于广华

doi:10.7498/aps.61.167503

摘要

在铁磁层(FM)/反铁磁层(FeMn)耦合体系中插入Pt 插层或对靠近FM/FeMn界面处的FeMn掺杂Pt元素,研究了体系的交换偏置场 Hex及矫顽力Hc随Pt插层深度 dPt与Pt掺杂层厚度tPtFeMn的变化关系. 实验结果表明,引入Pt插层后NiFe/FeMn(dPt)/Pt/FeMn体系的未补偿磁矩(UCS)的数量得到很大的提高,从而对Hex与Hc 起到增强的作用; 同时, 从实验结果可以推测FeMn层内部UCS的分布深度约为1.3 nm. 另外,对靠近FM/FeMn界面处的FeMn掺杂Pt元素,发现掺入Pt元素后体系的Hex 得到有效增强, 这是因为掺入Pt元素后体系UCS的数量也得到很大的提高.

关键词:

Abstract

By inserting a Pt spacer between ferromagnetic (FM)/antiferromagnetic (FeMn) coumpling systems or by doping Pt element in the AFM layer, the depth dependence of Pt spacer and the thickness dependence of Pt doping layer on exchange bias (Hex) and coercivity (Hc) are investigated. The results indicate that the number of uncompensated spin moments (UCSs) of NiFe/FeMn(dPt)/Pt/FeMn increases as a result of inserting Pt spacer, which enhances Hex and Hc of the system. Also, the distribution depth about 1.3 nm of UCS of FeMn in NiFe/FeMn system is inferred. Besides, by doping Pt element in FeMn near the FM/FeMn interlayer, we find that the Hex of the system is enhanced efficiently, which is caused by the huge increase of the number of UCSs in the system.

Keywords:

作者及机构信息

1.
北京科技大学材料物理与化学系, 北京 100083

基金项目: 国家自然科学基金(批准号: 51071023, 50831002)资助的课题.

Authors and contacts

1.
School of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 51071023, 50831002).

参考文献

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施引文献

[1]	Dieny B 1994 J. Magn. Magn. Mater. 136 335
[2]	Parkin S S P, Jiang X, Kaiser C, Panchula A, Roche K, Samant M 2003 Proc. IEEE 91 661
[3]	Park B G, Wunderlich J, Martí X, Holý V, Kurosaki Y, Yamada M, Yamamoto H, Nishide A, Hayakawa J, Takahashi H, Shick A B, Jungwirth T 2011 Nature Mater. 10 347
[4]	Meiklejohn W H, Bean C P 1956 Phys. Rev. 102 1413
[5]	Mauri D, Siegmann H C, Bagus P S, Kay E 1987 J. Appl. Phys. 62 3047
[6]	Malozemff A P 1987 Phys. Rev. B 35 3679
[7]	Koon N C 1997 Phys. Rev. Lett. 78 4865
[8]	Nowak U, Usadel K D, Keller J, Miltényi P, Beschoten B, Güntherodt G 2002 Phys. Rev. B 66 014430
[9]	Keller J, Miltényi P, Beschoten B, Güntherodt G, Nowak U, Usadel K D 2002 Phys. Rev. B 66 014431
[10]	Nogués J, Schuller I K 1999 J. Magn. Magn. Mater. 192 203
[11]	Takano K, Kodama R H, Berkowitz A E, Cao W, Thomas G 1997 Phys. Rev. Lett. 79 1130
[12]	Gloanec M, Rioual S, Lescop B, Zuberek R, Szymczak R, Aleshkevych P, Rouvellou B 2010 Phys. Rev. B 82 144433
[13]	Paul A 2010 Appl. Phys. Lett. 97 032505
[14]	Nolting F, Scholl A, Stöhr J, Seo J W, Fompeyrine J, Siegwart H, Locquet J P, Anders S, Lüning J, Fullerton E E, Toney M F, Scheinfein M R, Padmore H A 2000 Nature 405 767
[15]	Ohldag H, Scholl A, Nolting F, Arenholz E, Maat S, Young A T, Carey M, Stöhr J 2003 Phys. Rev. Lett. 91 017203
[16]	Morales R, Li Z P, Olamit J, Liu K, Alameda J M, Schuller I K 2009 Phys. Rev. Lett. 102 097201
[17]	Mishra S K, Radu F, Valencia S, Schmitz D, Schierle E, Dürr H A, Eberhardt W 2010 Phys. Rev. B 81 212404
[18]	Gökemeijer N J, Ambrose T, Chien C L 1997 Phys. Rev. Lett. 79 4270
[19]	Lechevallier L, Zarefy A, Lardé R, Chiron H, Le Breton J M, Baltz V, Rodmacq B, Dieny B 2009 Phys. Rev. B 79 174434
[20]	Ali M, Marrows C H, Hickey B J 2008 Phys. Rev. B 77 134401
[21]	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 58 7977]
[22]	Urazhdin S, Tabor P, Lim W L 2008 Phys. Rev. B 78 052403
[23]	Ma M, Cai L, Wang X F, Hu J G 2007 Acta Phys. Sin. 56 529 (in Chinese) [马梅,蔡蕾,王兴福, 胡经国 2007 56 529]
[24]	Liu Y, Jin C, Fu Y Q, Teng J, Liu M H, Liu Z Y, Yu G H 2008 J. Phys. D 41 205006

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