Direct observation of anisotropic magnetic field response of the spin helix in FeGe thin films

N. Kanazawa, J. S. White, H. M. Rønnow, C. D. Dewhurst, Y. Fujishiro, A. Tsukazaki, Y. Kozuka, M. Kawasaki, M. Ichikawa, F. Kagawa, Y. Tokura

研究成果: Article

13 引用 (Scopus)

抜粋

We report the observation by small-angle neutron scattering (SANS) of a magnetic helical structure confined in a thin film of the chiral lattice magnet FeGe. Twofold magnetic Bragg spots appearing below the magnetic transition temperature indicate the formation of a spin helix with a single propagation vector q aligned perpendicular to the film plane. Due to magnetic anisotropy, the direction of q is unaffected by an external magnetic field H. Instead we observe anisotropic deformations of the spin helix with respect to the H direction. In the configuration with Hq, the helical pitch exhibits hysteretic elongation with H, while the system tends to maintain an integer number of spiral turns within the film thickness by continuously pushing out one turn. For Hq, the helix is smoothly distorted to a conical structure with minimal change in the magnetic period. The direct measurement of q by SANS establishes a correspondence between helix deformation and macroscopic features observed in magnetization and magnetoresistivity.

元の言語English
記事番号184432
ジャーナルPhysical Review B
94
発行部数18
DOI
出版物ステータスPublished - 2016 11 28

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Kanazawa, N., White, J. S., Rønnow, H. M., Dewhurst, C. D., Fujishiro, Y., Tsukazaki, A., Kozuka, Y., Kawasaki, M., Ichikawa, M., Kagawa, F., & Tokura, Y. (2016). Direct observation of anisotropic magnetic field response of the spin helix in FeGe thin films. Physical Review B, 94(18), [184432]. https://doi.org/10.1103/PhysRevB.94.184432