Title :
Current-Induced Dynamics in a Skyrmion Lattice
Author :
Martinez, J.C. ; Jalil, M.B.A.
Author_Institution :
Comput. Nanoelectron. & Nano-Device Lab., Nat. Univ. of Singapore, Singapore, Singapore
Abstract :
We study the Thiele equation for the motion of skyrmions in a lattice under a spin current of electrons. We show that a threshold current for conduction electrons exists below which skyrmions are blocked. By mimicking a pinning center with a localized attractive potential, we study the effects of the Magnus force and the damping force and find that skyrmions cannot be pinned by a single pinning center. Pinning can be achieved with two attractive potentials. We study the effects of a mass term which can lead to cyclotron motion and estimate the cyclotron frequency.
Keywords :
cyclotrons; electron mobility; skyrmions; Magnus force; Thiele equation; conduction electrons; current-induced dynamics; cyclotron frequency; cyclotron motion; damping force; localized attractive potential; pinning center; skyrmion lattice; skyrmion motion; spin current; threshold current; Current density; Damping; Electron mobility; Force; Lattices; Threshold current; Torque; Magnetic memory;; nonlinear equations;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2015.2436401