Steady-state domain wall motion driven by adiabatic spin-transfer torque with assistance of microwave field

Journal Article · Mon Dec 23 04:00:00 EST 2013 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4860455· OSTI ID:22253147

Wang, Xi-guang; Guo, Guang-hua; Nie, Yao-zhuang; Xia, Qing-lin; Tang, Wei ^[1]; Wang, D. ^[2]; Zeng, Zhong-ming ^[3]

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1. School of Physics and Electronics, Central South University, Changsha 410083 (China)
2. Department of Physics, National University of Defense Technology, Changsha 410073 (China)
3. Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215123 (China)

We have studied the current-induced displacement of a 180° Bloch wall by means of micromagnetic simulation and analytical approach. It is found that the adiabatic spin-transfer torque can sustain a steady-state domain wall (DW) motion in the direction opposite to that of the electron flow without Walker Breakdown when a transverse microwave field is applied. This kind of motion is very sensitive to the microwave frequency and can be resonantly enhanced by exciting the domain wall thickness oscillation mode. A one-dimensional analytical model was established to account for the microwave-assisted wall motion. These findings may be helpful for reducing the critical spin-polarized current density and designing DW-based spintronic devices.

• OSTI ID: 22253147
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 26 Vol. 103; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BLOCH WALL
BREAKDOWN
CURRENT DENSITY
DESIGN
ELECTRONS
MICROWAVE RADIATION
SIMULATION
SPIN
SPIN ORIENTATION
STEADY-STATE CONDITIONS
THICKNESS
TORQUE