Intrinsic surface magnetic anisotropy in Y3Fe5 O12 as the origin of low-magnetic-field behavior of the spin Seebeck effect

Ken Ichi Uchida, Jun Ichiro Ohe, Takashi Kikkawa, Shunsuke Daimon, Dazhi Hou, Zhiyong Qiu, Eiji Saitoh

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

The magnetic-field dependence of the longitudinal spin Seebeck effect (LSSE) in a Pt/Y3Fe5O12 (YIG)-slab junction system was found to deviate from a bulk magnetization curve of the YIG slab in a low field range. In this paper, we show that the deviation originates from the difference between surface and bulk magnetization processes in the YIG slab and that it appears even when removing possible extrinsic magnetic anisotropy due to surface roughness and replacing the Pt layer with different materials. This result indicates that the anomalous field dependence of the LSSE is due to an intrinsic magnetic property of the YIG surface. Our numerical calculation based on the Landau-Lifshitz-Gilbert equation shows that the deviation between the LSSE and bulk magnetization curves is qualitatively explained by introducing easy-axis perpendicular magnetic anisotropy near the surface of YIG.

Original languageEnglish
Article number014415
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number1
DOIs
Publication statusPublished - 2015 Jul 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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