Equations of Motion and Frequency Dependence of Magnon-Induced Domain Wall Motion
arXiv:1706.02709 · doi:10.1103/PhysRevB.96.174441
Abstract
Spin waves can induce domain wall motion in ferromagnets. We derive the equations of motion for a transverse domain wall driven by spin waves. Our calculations show that the magnonic spin-transfer torque does not cause rotation-induced Walker breakdown. The amplitude of spin waves that are excited by a localized microwave field depends on the spatial profile of the field and the excitation frequency. By taking this frequency dependence into account, we show that a simple one-dimensional model may reproduce much of the puzzling frequency dependence observed in early numerical studies.
arXiv comment7 pages, 7 figures
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