Chiral spin-wave edge modes in dipolar magnetic thin films

Ryuichi Shindou, Jun Ichiro Ohe, Ryo Matsumoto, Shuichi Murakami, Eiji Saitoh

Research output: Contribution to journalArticlepeer-review

94 Citations (Scopus)

Abstract

Based on a linearized Landau-Lifshitz equation, we show that two-dimensional periodic allay of ferromagnetic particles coupled with magnetic dipole-dipole interactions supports chiral spin-wave edge modes, when subjected under the magnetic field applied perpendicular to the plane. The mode propagates along a one-dimensional boundary of the system in a unidirectional way and it always has a chiral dispersion within a band gap for spin-wave volume modes. Contrary to the well-known Damon-Eshbach surface mode, the sense of the rotation depends not only on the direction of the field but also on the strength of the field; its chiral direction is generally determined by the sum of the so-called Chern integers defined for spin-wave volume modes below the band gap. Using simple tight-binding descriptions, we explain how the magnetic dipolar interaction endows spin-wave volume modes with nonzero Chern integers and how their values will be changed by the field.

Original languageEnglish
Article number174402
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number17
DOIs
Publication statusPublished - 2013 May 2

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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