铁磁/反铁磁双层膜系统中的磁畴动力学行为

朱金荣; 香妹; 胡经国

doi:10.7498/aps.61.187504

摘要

比较了铁磁单层膜与铁磁/反铁磁双层膜结构中的磁畴演化行为, 发现由于反铁磁层膜对铁磁层膜的耦合作用使得系统的磁畴壁厚度、磁畴壁等效质量、磁畴壁移动速度等发生了改变, 系统的矫顽场增强, 并出现了交换偏置场. 文章具体研究了反铁磁层耦合作用下其磁畴壁厚度、等效质量以及磁畴壁移动速度等与反铁磁层的净磁化、磁各向异性、界面耦合强度以及温度等的关系; 并研究了其对铁磁/反铁磁双层膜中的交换偏置场、矫顽场的影响. 进而从磁畴结构的形成及其演化上揭示了铁磁/反铁磁双层膜中出现交换偏置以及矫顽场增加的物理机制.

关键词:

Abstract

The magnetic domain evolution behaviors of ferromagnetic (FM) monolayer and ferromagnetic (FM)/antiferromagnetic (AFM) bilayer are compared and analyzed. The results indicate that the equivalent width, mass and velocity of magnetic domain wall are changed, then the coercivity is enhanced and the exchange bias is present due to the exchange coupling between anti- ferromagnetic and ferromagnetic layer. The results also show that the equivalent width, mass and velocity of magnetic domain wall for FM /AFM bilayers system could be varied with the change of the net magnetization of antiferromagnetic layer, the magnetic anisotropy constants of FM and AFM layer, the exchange coupling constant of antiferromagnetic layer, interface exchange coupling constant and the temperature, and the relevant influences on the coercivity and exchange bias are discussed. So, the physical mechanisms of the emergence of exchange bias and enhancement of coercivity are discovered by the formation and evolution of the domain wall.

Keywords:

作者及机构信息

1.
扬州大学物理科学与技术学院, 扬州 225002

基金项目: 国家自然科学基金(批准号: 10974170)和国家自然科学青年基金(批准号: 11104239, 11104240)资助的课题.

Authors and contacts

1.
College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 10974170) and the National Natural Science Foundation of China for Youths (Grant Nos. 11104239, 11104240).

参考文献

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[2]	Meiklejohn W H, Bean C P 1956 Phys. Rev. 102 1413
[3]	Meiklejohn W H, Bean C P 1957 Phys. Rev. 105 904
[4]	Stamps R L 2000 J. Phys. D: Appl. Phys. 33 247
[5]	Nowak U, Usadel K D, Keller J, Miltenyi P, Beschoten B, Guntherodt G 2002 Phys. Rev. B 66 014430
[6]	Wu X W, Chien C L 1998 Phys. Rev. Lett. 81 2795
[7]	Eftaxias E, Trohidou K N 2005 Phys. Rev. B 71 134406
[8]	Miltenyi P, Gierlings M, Keller J, Beschoten B, Guntherodt G, Norwak U, Usadel K D 2000 Phys. Rev. Lett. 84 4224
[9]	Bae S, Judy J H, Egelhoff W F 2000 J. Appl. Phys. 87 6650
[10]	Jungblut R, Coehoorn R, Johnson M T, Sauer C, van der Zaag P J, Ball A R 1995 Magn. Magn. Mater. 148 300
[11]	Nakatani R, Hoshino K, Noguchi S, Sugita Y 1994 Appl. Phys. 33 133
[12]	Bae S, Judy J H, Egelhoff W F, Chen P J 2000 J. Appl. Phys. 87 6650
[13]	Tian H Y, Xu X Y, Hu J G 2009 Acta Phys. Sin. 58 2757 (in Chinese) [田宏玉, 许小勇, 胡经国 2009 物理学报 58 2757]
[14]	Tsang C, Fontana R E, Lin F 1994 IEEE Trans. Magn. 30 3801
[15]	Dieny B, Speriosu V, Parkin P 1991 Phys. Rev. B 43 1297
[16]	Heim D E, Fontana Jr R E, Tsang C 1994 IEEE Trans. Magn. 30 316
[17]	Daughton J M, Chen Y J 1993 IEEE Trans. Magn. 29 2705
[18]	Dieny B J 1994 Magn. Magn. Mater. 136 335
[19]	Stamps R L, Usadel K D 2006 Eur. Phys. Lett. 74 512
[20]	Xu Y, Hu J G, Stamps R L 2008 Commuun. Theor. Phys. 50 253
[21]	Scholten G, Usadel K D, Nowak U 2005 Phys. Rev. B 71 064413
[22]	Zhong W D 1998 Ferromagnetics (2) (Beijing: Science Press) p95 (in Chinese) [钟文定 1998 铁磁学(中册) (北京: 科学出版社) p95]

施引文献

[1]	Noges J, Schuller I K 1999 Magn. Magn. Mater. 192 203
[2]	Meiklejohn W H, Bean C P 1956 Phys. Rev. 102 1413
[3]	Meiklejohn W H, Bean C P 1957 Phys. Rev. 105 904
[4]	Stamps R L 2000 J. Phys. D: Appl. Phys. 33 247
[5]	Nowak U, Usadel K D, Keller J, Miltenyi P, Beschoten B, Guntherodt G 2002 Phys. Rev. B 66 014430
[6]	Wu X W, Chien C L 1998 Phys. Rev. Lett. 81 2795
[7]	Eftaxias E, Trohidou K N 2005 Phys. Rev. B 71 134406
[8]	Miltenyi P, Gierlings M, Keller J, Beschoten B, Guntherodt G, Norwak U, Usadel K D 2000 Phys. Rev. Lett. 84 4224
[9]	Bae S, Judy J H, Egelhoff W F 2000 J. Appl. Phys. 87 6650
[10]	Jungblut R, Coehoorn R, Johnson M T, Sauer C, van der Zaag P J, Ball A R 1995 Magn. Magn. Mater. 148 300
[11]	Nakatani R, Hoshino K, Noguchi S, Sugita Y 1994 Appl. Phys. 33 133
[12]	Bae S, Judy J H, Egelhoff W F, Chen P J 2000 J. Appl. Phys. 87 6650
[13]	Tian H Y, Xu X Y, Hu J G 2009 Acta Phys. Sin. 58 2757 (in Chinese) [田宏玉, 许小勇, 胡经国 2009 物理学报 58 2757]
[14]	Tsang C, Fontana R E, Lin F 1994 IEEE Trans. Magn. 30 3801
[15]	Dieny B, Speriosu V, Parkin P 1991 Phys. Rev. B 43 1297
[16]	Heim D E, Fontana Jr R E, Tsang C 1994 IEEE Trans. Magn. 30 316
[17]	Daughton J M, Chen Y J 1993 IEEE Trans. Magn. 29 2705
[18]	Dieny B J 1994 Magn. Magn. Mater. 136 335
[19]	Stamps R L, Usadel K D 2006 Eur. Phys. Lett. 74 512
[20]	Xu Y, Hu J G, Stamps R L 2008 Commuun. Theor. Phys. 50 253
[21]	Scholten G, Usadel K D, Nowak U 2005 Phys. Rev. B 71 064413
[22]	Zhong W D 1998 Ferromagnetics (2) (Beijing: Science Press) p95 (in Chinese) [钟文定 1998 铁磁学(中册) (北京: 科学出版社) p95]

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