Abstract
Herein, we report an exotic domain-wall dynamics showing double Walker breakdowns in magnetic multilayer films composed of two magnetic layers. Such multiple Walker breakdowns are attributed to the internal magnetic dipole field, which is antisymmetric on the domain walls of the lower and upper magnetic layers. A micromagnetic simulation shows four phases of the domain-wall dynamics, which result in a phase diagram with the phase boundaries of the double Walker breakdown fields. Such double Walker breakdowns lead to two minima in the variation of the domain-wall velocity, as often observed experimentally.
Highlights
We report an exotic domain-wall dynamics showing double Walker breakdowns in magnetic multilayer films composed of two magnetic layers
Most of the studies of magnetic domain walls (DWs) motion in magnetic multilayered structures was done without consideration of the DW configuration
Since the magnetic DW motion in magnetic multilayered structures have drawn more attention in magnetic application d evices[1,2,3,4], more comprehensive understanding on the magnetic DW motion is required within the context of the DW configuration
Summary
We report an exotic domain-wall dynamics showing double Walker breakdowns in magnetic multilayer films composed of two magnetic layers. The device operation is performed by switching between the magnetization states as done for the magnetic random-access memory and/or the displacement of magnetic structures as done for the magnetic racetrack m emory[3,4] These magnetization dynamics and their characteristics are determined by magnetic parameters such as perpendicular magnetic anisotropy, Dzyaloshinskii–Moriya interaction, and the spin–orbit coupling e ffect[5,6,7,8,9]. A micromagnetic study was carried out to explain the exotic coupled behavior within the context of multiple Walker breakdowns of DWs in each magnetic layer
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