Current-driven domain wall motion enhanced by the microwave field

Journal Article · Mon Jul 14 04:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4887801· OSTI ID:22308969

Wang, Xi-guang; Guo, Guang-hua; Nie, Yao-zhuang; Wang, Dao-wei; Li, Zhi-xiong; Tang, Wei ^[1]; Zeng, Zhong-ming ^[2]

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

The magnetic domain wall (DW) motion driven by a spin-polarized current opens a new concept for memory and logic devices. However, the critical current density required to overcome the intrinsic and/or extrinsic pinning of DW remains too large for practical applications. Here, we show, by using micromagnetic simulations and analytical approaches, that the application of a microwave field offers an effective solution to this problem. When a transverse microwave field is applied, the adiabatic spin-transfer torque (STT) alone can sustain a steady-state DW motion without the sign of Walker breakdown, meaning that the intrinsic pinning disappears. The extrinsic pinning can also be effectively reduced. Moreover, the DW velocity is increased greatly for the microwave-assisted DW motion. This provides a new way to manipulate the DW motion at low current densities.

• OSTI ID: 22308969
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 2 Vol. 116; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BREAKDOWN
CRITICAL CURRENT
CURRENT DENSITY
EQUIPMENT
MEMORY DEVICES
MICROWAVE RADIATION
SIMULATION
SPIN ORIENTATION
STEADY-STATE CONDITIONS