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arXiv · 1507.01369

Spin Wave Eigenmodes of Dzyaloshinskii Domain Walls

Pablo Borys·Felipe Garcia-Sanchez·Joo-Von Kim·Robert L. Stamps
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Abstract

A theory for the spin wave eigenmodes of a Dzyaloshinskii domain wall is presented. These walls are N\'eel-type domain walls that can appear in perpendicularly-magnetized ultrathin ferromagnets in the presence of a sizeable Dzyaloshinskii-Moriya interaction. The mode frequencies for spin waves propagating parallel and perpendicular to the domain wall are computed using a continuum approximation. In contrast to Bloch-type walls, it is found that the spin wave potential associated with Dzyaloshinskii domain walls is not reflectionless, which leads to a finite scattering cross-section for interactions between spin waves and domain walls. A gap produced by the Dzyaloshinskii interaction emerges, and consequences for spin wave driven domain wall motion and band structures arising from periodic wall arrays are discussed.

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Pablo Borys, Felipe Garcia-Sanchez, Joo-Von Kim, Robert L. Stamps. 2015-07-06. Spin Wave Eigenmodes of Dzyaloshinskii Domain Walls. https://arxiv.org/abs/1507.01369

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