Discontinuous properties of current-induced magnetic domain wall depinning

被引：5

作者：

Hu, X. F. ^{[1
,2
]}

Wu, J. ^{[2
,3
]}

Niu, D. X. ^{[1
,2
]}

Chen, L. ^{[4
]}

Morton, S. A. ^{[5
]}

Scholl, A. ^{[5
]}

Huang, Z. C. ^{[6
]}

Zhai, Y. ^{[6
]}

Zhang, W. ^{[1
]}

Will, I. ^{[1
]}

Xu, Y. B. ^{[1
,2
]}

Zhang, R. ^{[2
]}

van der Laan, G. ^{[7
]}

机构：

[1] Univ York, Dept Elect, Spintron & Nanodevice Lab, York YO10 5DD, N Yorkshire, England

[2] Nanjing Univ, Sch Elect Sci & Engn, Nanjing York Int Ctr Spintron, Nanjing 210093, Jiangsu, Peoples R China

[3] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

[4] Univ Leeds, Dept Elect, Leeds LS2 9JT, W Yorkshire, England

[5] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[6] Southeast Univ, Dept Phys, Nanjing 211189, Jiangsu, Peoples R China

[7] Magnet Spect Grp, Diamond Light Source, Didcot OX11 0DE, Oxon, England

来源：

SCIENTIFIC REPORTS | 2013年 / 3卷

基金：

英国工程与自然科学研究理事会;

关键词：

APPLIED PHYSICS; MAGNETIC DEVICES; SPINTRONICS; FERROMAGNETISM; MOTION; DYNAMICS;

D O I：

10.1038/srep03080

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The current-induced motion of magnetic domain walls (DWs) confined to nanostructures is of great interest for fundamental studies as well as for technological applications in spintronic devices. Here, we present magnetic images showing the depinning properties of pulse-current-driven domain walls in well-shaped Permalloy nanowires obtained using photoemission electron microscopy combined with x-ray magnetic circular dichroism. In the vicinity of the threshold current density (Jth = 4.2 x 10(11) A.m(-2)) for the DW motion, discontinuous DW depinning and motion have been observed as a sequence of "Barkhausen jumps". A one-dimensional analytical model with a piecewise parabolic pinning potential has been introduced to reproduce the DW hopping between two nearest neighbour sites, which reveals the dynamical nature of the current-driven DW motion in the depinning regime.

引用

页数：7

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