2013/03/31 by Ryuichi Shindou, Jun-ichiro Ohe, Ryo Matsumoto +2
Physics and Astronomy · #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Topological Materials and Phenomena #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.87.174402
published as Phys. Rev. B 87, 174402 (2013) · 18 pages, 16 figures, some trivial typo in equations are fixed
openalex publication_date 2013/05/02 · arxiv created 2013/05/25 · arxiv updated 2013/05/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
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.