Nonuniform switching of the perpendicular magnetization in a spin-torque-driven magnetic nanopillar

被引：44

作者：

Bernstein, David P. ^{[1
]}

Braeuer, Bjoern ^{[1
]}

Kukreja, Roopali ^{[1
]}

Stoehr, Joachim ^{[1
]}

Hauet, Thomas ^{[2
,3
]}

Cucchiara, Julien ^{[2
]}

Mangin, Stephane ^{[2
]}

Katine, Jordan A. ^{[3
]}

Tyliszczak, Tolek ^{[4
]}

Chou, Kang W. ^{[4
]}

Acremann, Yves ^{[5
]}

机构：

[1] Stanford Inst Mat & Energy Sci, SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[2] Nancy Univ, UPV Metz, CNRS, Inst Jean Lamour, Vandoeuvre Les Nancy, France

[3] Hitachi Global Storage Technol, San Jose, CA 95119 USA

[4] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA

[5] ETH, Solid State Phys Lab, Zurich, Switzerland

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.83.180410

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Time-resolved scanning transmission x-ray microscopy measurements were performed to study the current-induced magnetization switching mechanism in nanopillars exhibiting strong perpendicular magnetic anisotropy. This technique provides both short-time (70 ps) and high-spatial (25 nm) resolutions. Direct imaging of the magnetization demonstrates that, after an incubation time of similar to 1.3 ns, a 100 x 300 nm(2) ellipsoidal device switches in similar to 1 ns via a central domain nucleation and opposite propagation of two domain walls toward the edges. High domain-wall velocities on the order of 100 m/s are measured. Micromagnetic simulations are shown to be in good agreement with experimental results and provide insight into magnetization dynamics during the incubation and reversal periods.

引用

页数：4

共 19 条

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