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

doi:10.1103/PhysRevB.92.014415

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 journal › Article › peer-review

37 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 language	English
Article number	014415
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	92
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.92.014415
Publication status	Published - 2015 Jul 15

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.92.014415

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

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.",

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AU - Uchida, Ken Ichi

AU - Ohe, Jun Ichiro

AU - Kikkawa, Takashi

AU - Daimon, Shunsuke

AU - Hou, Dazhi

AU - Qiu, Zhiyong

AU - Saitoh, Eiji

PY - 2015/7/15

Y1 - 2015/7/15

N2 - 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.

AB - 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.

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

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