温度、缺陷对磁畴壁动力学行为的影响

朱金荣; 范吕超; 苏垣昌; 胡经国

doi:10.7498/aps.65.237501

摘要

基于Landau-Lifshitz-Gilbert自旋动力学方法，研究了磁纳米条中缺陷、温度对其电流驱动磁畴壁移动性质的影响.研究结果表明：缺陷能有效钉扎电流对磁畴壁的驱动作用，并且其钉扎能力依赖于其缺陷浓度、位置及形态.而温度能有效地去钉扎.特别地，缺陷处的焦耳热能有效地消除其缺陷对磁畴壁的钉扎作用.进一步的研究表明：其影响磁畴壁移动的缘由在于缺陷、温度能有效调节磁纳米条中磁畴壁的面外磁化强度.

关键词:

磁畴壁 /
电流驱动 /
缺陷 /
温度

Abstract

Current-induced domain wall motion, which has potential application in the next-generation data storage and logic device, has attracted much interest in recent years. However, how the material defect and its joule heat influence current-driven domain wall motion in magnetic nanostripe is still unclear. This paper is to deal with these issues by using the Landau-Lifshitz-Gilbert spin dynamics. The results show that the material defect can pin domain wall motion and this pinning effect strongly depends on the defect concentration, location and shape. The pinning effect induced by the defect on domain wall motion results in the increase of threshold current, and the domain wall moves steadily and continuously. Specifically, the probability for domain wall motion induced by pinning effect is nonlinearly increasing with the increase of defect concentration. Namely, the increasing of the pinning ability with the increase of the defect concentration becomes fades away. Initially, when the defect is near to domain wall, the pinning ability is obvious. However, the pinning ability is not linearly increasing with the decrease of the initial distance between the defect and the domain wall. The results also show that the single defect is larger, the probability for domain wall motion induced by defect pining is bigger. Moreover, the material defect can suppress the domain wall trending toward breakdown and make domain wall move faster, but the suppressing ability is not obviously increasing with the increase of the defect concentration. On the other hand, the temperature field can remove the pinning phenomenon, which will result in the threshold current decrease. The decrease of the threshold current is of benefit to the working of the data storage and logic device. Also the temperature field can suppress the domain wall trending toward breakdown, but the suppressing ability is less than that of the defect. In addition, the Joule heat around defects can obviously eliminate the pinning effect of the defects, so the pinning effect for a few defects on current-induced domain wall motion can be ignored. Further analysis indicates that these effects are due to the change of the out-of-plane magnetization of the domain wall induced by the material defects and the temperature field, because the velocity of the domain wall motion induced by the applied current greatly depends on the out-of-plane magnetization 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

通信作者: 苏垣昌, ycsu@yzu.edu.cn;jghu@yzu.edu.cn ; 胡经国, ycsu@yzu.edu.cn;jghu@yzu.edu.cn

基金项目: 国家自然科学基金（批准号：11374253）和江苏省高校自然科学研究基金（批准号：16KJB140018）资助的课题.

Authors and contacts

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

Corresponding author: Chao Su, ycsu@yzu.edu.cn;jghu@yzu.edu.cn ; Hu Jing-Guo, ycsu@yzu.edu.cn;jghu@yzu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11374253) and the Natural Science Foundation of the Higher Education Institutions of Jiangsu Province, China (Grant No. 16KJB140018).

参考文献

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[10]	Su Y, Sun J, Hu J, Lei H 2013 Europhys. Lett. 103 67004
[11]	Curiale J, Lemaitre A, Niazi T, Faini G, Jeudy V 2012 J. Appl. Phys. 112 103922
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[15]	Lee J Y, Lee K S, Kim S K 2007 Appl. Phys. Lett. 91 122513
[16]	Kruger B, Kim D H, Fischer P 2007 Phys. Rev. Lett. 98 187202
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[18]	Akerman J, Muöoz M, Maicas M, Prieto J L 2010 Phys. Rev. B 82 064426
[19]	Yuan H Y, Wang X R 2014 Phys. Rev. B 89 054423
[20]	Huang S H, Laia C H 2009 Appl. Phys. Lett. 95 032505
[21]	Leliaert J, Wiele B V, Vansteenkiste A 2014 Phys. Rev. B 89 064419
[22]	Martinez E 2012 J. Appl. Phys. 111 07D302
[23]	Zhu J, Han Z, Su Y, Hu J 2014 J. Magn. Magn. Mater. 369 96
[24]	Martinez E, Lopez-Diaz L, Alejos O, Torres L 2009 J. Appl. Phys. 106 043914
[25]	Garcia-Sanchez F, Szambolics H, Mihai A, Vila L, Marty A, Attané J, Toussaint J, Buda-Prejbeanu L D 2010 Phys. Rev. B 81 134408
[26]	He J, Li Z, Zhang S 2006 Phys. Rev. B 73 184408
[27]	Thiaville A, Nakatani Y, Miltat J, Suzuki Y 2005 Europhys. Lett. 69 90
[28]	Burn D M, Atkinson D 2013 Appl. Phys. Lett. 102 242414
[29]	Zhang S, Li Z 2004 Phys. Rev. Lett. 93 127204
[30]	Bryan M T, Schrefl T, Atkinson D, Allwood D A 2008 J. Appl. Phys. 103 073906

施引文献

[1]	Parkin S S P, Hayashi M, Thomas L 2008 Science 320 190
[2]	Allwood D A, Xiong G, Faulkner C C, Atkinson D, Petit D, Cowburn R P 2005 Science 309 2008
[3]	Ito M, Ooba A, Komine T, Sugita R 2013 J. Magn. Magn. Mater. 340 61
[4]	Komine T, Takahashi K, Ooba A, Sugita R 2011 J. Appl. Phys. 109 07D503
[5]	Roy P E, Wunderlich J 2011 Appl. Phys. Lett. 99 122504
[6]	Heyne L, Rhensius J, Bisig A, Krzyk S, Punke P 2010 Appl. Phys. Lett. 96 032504
[7]	Heinen J, Boulle O, Rousseau K, Malinowski G, Klöui M 2010 Appl. Phys. Lett. 96 202510
[8]	Curiale J, Lemaitre A, Ulysse C, Faini G, Jeudy V 2012 Phys. Rev. Lett. 108 076604
[9]	Torrejon J, Malinowski G, Pelloux M, Weil R, Thiaville A, Curiale J, Lacour D, Montaigne F, Hehn M 2012 Phys. Rev. Lett. 109 106601
[10]	Su Y, Sun J, Hu J, Lei H 2013 Europhys. Lett. 103 67004
[11]	Curiale J, Lemaitre A, Niazi T, Faini G, Jeudy V 2012 J. Appl. Phys. 112 103922
[12]	Glathe S, Mattheis R, Berkov D V 2008 Appl. Phys. Lett. 93 072508
[13]	Schryer N L, Walker L R 1974 J. Appl. Phys. 45 5406
[14]	Yan M, Kákay A, Gliga S, Hertel R 2010 Phys. Rev. Lett. 104 057201
[15]	Lee J Y, Lee K S, Kim S K 2007 Appl. Phys. Lett. 91 122513
[16]	Kruger B, Kim D H, Fischer P 2007 Phys. Rev. Lett. 98 187202
[17]	Ueda K, Koyama T, Chiba D, Shimamura K, Tanigawa H, Fukami S, Suzuki T, Ohshima N, Ishiwata N, Nakatani Y 2011 Appl. Phys. Express 4 063003
[18]	Akerman J, Muöoz M, Maicas M, Prieto J L 2010 Phys. Rev. B 82 064426
[19]	Yuan H Y, Wang X R 2014 Phys. Rev. B 89 054423
[20]	Huang S H, Laia C H 2009 Appl. Phys. Lett. 95 032505
[21]	Leliaert J, Wiele B V, Vansteenkiste A 2014 Phys. Rev. B 89 064419
[22]	Martinez E 2012 J. Appl. Phys. 111 07D302
[23]	Zhu J, Han Z, Su Y, Hu J 2014 J. Magn. Magn. Mater. 369 96
[24]	Martinez E, Lopez-Diaz L, Alejos O, Torres L 2009 J. Appl. Phys. 106 043914
[25]	Garcia-Sanchez F, Szambolics H, Mihai A, Vila L, Marty A, Attané J, Toussaint J, Buda-Prejbeanu L D 2010 Phys. Rev. B 81 134408
[26]	He J, Li Z, Zhang S 2006 Phys. Rev. B 73 184408
[27]	Thiaville A, Nakatani Y, Miltat J, Suzuki Y 2005 Europhys. Lett. 69 90
[28]	Burn D M, Atkinson D 2013 Appl. Phys. Lett. 102 242414
[29]	Zhang S, Li Z 2004 Phys. Rev. Lett. 93 127204
[30]	Bryan M T, Schrefl T, Atkinson D, Allwood D A 2008 J. Appl. Phys. 103 073906

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