Numerical Study of Current-Induced Domain-Wall Dynamics: Crossover from Spin Transfer to Momentum Transfer - Condensed Matter > Mesoscale and Nanoscale PhysicsReport as inadecuate




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Abstract: We study current-induced dynamics of a magnetic domain wall by solving atime-dependent Schr\-{o}dinger equation combined with Landau-Lifshitz-Gilbertequation in a one-dimensional electron system coupled to localized spins. Twotypes of domain-wall motions are observed depending on the hard-axisanisotropy, $K {\perp}$, of the localized spin system. For small values of$K {\perp}$, the magnetic domain wall shows a streaming motion driven by spintransfer. In contrast, for large values of $K {\perp}$, a stick-slip motiondriven by momentum transfer is obtained. We clarify the origin of thesecharacters of domain-wall motions in terms of the dynamics of one-particleenergy levels and distribution functions.



Author: Daisuke Matsubayashi, Masafumi Udagawa, Masao Ogata

Source: https://arxiv.org/







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