The stability of steady motion of magnetic domain wall: Role of higher-order spin-orbit torques

Journal Article · Mon Dec 14 04:00:00 EST 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4937131· OSTI ID:22493019

He, Peng-Bin; Yan, Han; Cai, Meng-Qiu ^[1]; Li, Zai-Dong ^[2]

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1. School of Physics and Electronics, Hunan University, Changsha 410082 (China)
2. Department of Applied Physics, Hebei University of Technology, Tianjin 300401 (China)

The steady motion of magnetic domain wall driven by spin-orbit torques is investigated analytically in the heavy/ferromagnetic metal nanowires for three cases with a current transverse to the in-plane and perpendicular easy axis, and along the in-plane easy axis. By the stability analysis of Walker wall profile, we find that if including the higher-order spin-orbit torques, the Walker breakdown can be avoided in some parameter regions of spin-orbit torques with a current transverse to or along the in-plane easy axis. However, in the case of perpendicular anisotropy, even considering the higher-order spin-orbit torques, the velocity of domain wall cannot be efficiently enhanced by the current. Furthermore, the direction of wall motion is dependent on the configuration and chirality of domain wall with a current along the in-plane easy axis or transverse to the perpendicular one. Especially, the direction of motion can be controlled by the initial chirality of domain wall. So, if only involving the spin-orbit mechanism, it is preferable to adopt the scheme of a current along the in-plane easy axis for enhancing the velocity and controlling the direction of domain wall.

• OSTI ID: 22493019
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 22 Vol. 118; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANALYTIC FUNCTIONS
ANISOTROPY
BREAKDOWN
CHIRALITY
FERROMAGNETIC MATERIALS
L-S COUPLING
MAGNETIC FIELDS
METALS
NANOWIRES
STABILITY
TORQUE