Domain nucleation mediated spin-transfer switching in magnetic nanopillars with perpendicular anisotropy

被引：37

作者：

Li, Xuan ^{[1
,2
]}

Zhang, Zongzhi ^{[1
,2
]}

Jin, Q. Y. ^{[1
,2
]}

Liu, Yaowen ^{[3
]}

机构：

[1] Fudan Univ, State Key Lab Adv Photon Mat & Devices, Shanghai 200433, Peoples R China

[2] Fudan Univ, Dept Opt Sci & Engn, Shanghai 200433, Peoples R China

[3] Tongji Univ, Dept Phys, Shanghai 200092, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 12期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1063/1.2897298

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Spin-transfer-driven switching is investigated by micromagnetic simulation in perpendicular spin valve nanopillars with a free layer structure which contains two in-film-plane regions: a main perpendicularly magnetized hard region and a soft nanocore with intrinsic in-plane anisotropy. The temporal magnetization snapshots demonstrate that the current-induced magnetization rotation starts from the nanocore, followed by an incoherent switching process mediated by domain nucleation and expansion. The initial magnetization rotation of nanocore to in-plane direction generates driving force acting on the hard region via exchange coupling, together with locally enhanced spin torque, leading to considerable reduction in both critical current and switching time. (C) 2008 American Institute of Physics.

引用

页数：3

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