Enhanced room-temperature spin Seebeck effect in a YIG/C60/Pt layered heterostructure

R. Das; V. Kalappattil; R. Geng; H. Luong; M. Pham; T. Nguyen; Tao Liu; Mingzhong Wu; M. H. Phan; H. Srikanth

doi:10.1063/1.5007233

AIP Advances (May 2018)

Enhanced room-temperature spin Seebeck effect in a YIG/C60/Pt layered heterostructure

R. Das,
V. Kalappattil,
R. Geng,
H. Luong,
M. Pham,
T. Nguyen,
Tao Liu,
Mingzhong Wu,
M. H. Phan,
H. Srikanth

Affiliations

R. Das: Department of Physics, University of South Florida, Tampa, Florida 33620, USA
V. Kalappattil: Department of Physics, University of South Florida, Tampa, Florida 33620, USA
R. Geng: Department of Physics and Astronomy, University of Georgia, Athens, GA 30602, USA
H. Luong: Department of Physics and Astronomy, University of Georgia, Athens, GA 30602, USA
M. Pham: Department of Physics and Astronomy, University of Georgia, Athens, GA 30602, USA
T. Nguyen: Department of Physics and Astronomy, University of Georgia, Athens, GA 30602, USA
Tao Liu: Department of Physics, Colorado State University, Fort Collins, CO 80523, USA
Mingzhong Wu: Department of Physics, Colorado State University, Fort Collins, CO 80523, USA
M. H. Phan: Department of Physics, University of South Florida, Tampa, Florida 33620, USA
H. Srikanth: Department of Physics, University of South Florida, Tampa, Florida 33620, USA

DOI: https://doi.org/10.1063/1.5007233
Journal volume & issue: Vol. 8, no. 5
pp. 055906 – 055906-5

Abstract

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We report on large enhancement of the longitudinal spin Seebeck effect (LSSE) in the Y3Fe5O12 (YIG)/Pt system at room temperature due to the addition of a thin layer of organic semiconductor (C60) in between the YIG and the Pt. LSSE measurements show that the LSSE voltage increases significantly, from the initial value of 150 nV for the YIG/Pt structure to 240 nV for the YIG/C60(5nm)/Pt structure. Radio-frequency transverse susceptibility experiments reveal a significant decrease in the surface perpendicular magnetic anisotropy (PMA) of the YIG film when C60 is deposited on it. These results suggest that the LSSE enhancement may be attributed to increased spin mixing conductance, the decreased PMA, and the large spin diffusion length of C60.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

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