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Title: Spin transport in an insulating ferrimagnetic-antiferromagnetic-ferrimagnetic trilayer as a function of temperature

Abstract

We present a study of the transport properties of thermally generated spin currents in an insulating ferrimagnetic-antiferromagnetic-ferrimagnetic trilayer over a wide range of temperature. Spin currents generated by the spin Seebeck effect (SSE) in a yttrium iron garnet (YIG) YIG/NiO/YIG trilayer on a gadolinium gallium garnet (GGG) substrate were detected using the inverse spin Hall effect (ISHE) in Pt. By studying samples with different NiO thicknesses, the spin diffusion length of NiO was determined to be ~3.8 nm at room temperature. Surprisingly, a large increase of the SSE signal was observed below 30 K, and the field dependence of the signal closely follows a Brillouin function for an S=7/2 spin. The increase of the SSE signal at low temperatures could thus be associated with the paramagnetic SSE from the GGG substrate. Besides, a broad peak in the SSE response was observed around 100 K. These observations are important in understanding the generation and transport properties of spin currents through magnetic insulators and the role of a paramagnetic substrate in spin current generation.

Authors:
ORCiD logo [1];  [1];  [1];  [2];  [1]; ORCiD logo [3];  [3];  [2];  [1]
  1. New York Univ., New York, NY (United States)
  2. Colorado State Univ., Fort Collins, CO (United States)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
IARPA; USDOE
OSTI Identifier:
1575253
Alternate Identifier(s):
OSTI ID: 1571835
Report Number(s):
SAND-2019-13897J
Journal ID: ISSN 2158-3226; 681470; TRN: US2001079
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 9; Journal Issue: 10; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Chen, Yizhang, Cogulu, Egecan, Roy, Debangsu, Ding, Jinjun, Mohammadi, Jamileh Beik, Kotula, Paul G., Missert, Nancy A., Wu, Mingzhong, and Kent, Andrew D. Spin transport in an insulating ferrimagnetic-antiferromagnetic-ferrimagnetic trilayer as a function of temperature. United States: N. p., 2019. Web. doi:10.1063/1.5116549.
Chen, Yizhang, Cogulu, Egecan, Roy, Debangsu, Ding, Jinjun, Mohammadi, Jamileh Beik, Kotula, Paul G., Missert, Nancy A., Wu, Mingzhong, & Kent, Andrew D. Spin transport in an insulating ferrimagnetic-antiferromagnetic-ferrimagnetic trilayer as a function of temperature. United States. doi:10.1063/1.5116549.
Chen, Yizhang, Cogulu, Egecan, Roy, Debangsu, Ding, Jinjun, Mohammadi, Jamileh Beik, Kotula, Paul G., Missert, Nancy A., Wu, Mingzhong, and Kent, Andrew D. Fri . "Spin transport in an insulating ferrimagnetic-antiferromagnetic-ferrimagnetic trilayer as a function of temperature". United States. doi:10.1063/1.5116549. https://www.osti.gov/servlets/purl/1575253.
@article{osti_1575253,
title = {Spin transport in an insulating ferrimagnetic-antiferromagnetic-ferrimagnetic trilayer as a function of temperature},
author = {Chen, Yizhang and Cogulu, Egecan and Roy, Debangsu and Ding, Jinjun and Mohammadi, Jamileh Beik and Kotula, Paul G. and Missert, Nancy A. and Wu, Mingzhong and Kent, Andrew D.},
abstractNote = {We present a study of the transport properties of thermally generated spin currents in an insulating ferrimagnetic-antiferromagnetic-ferrimagnetic trilayer over a wide range of temperature. Spin currents generated by the spin Seebeck effect (SSE) in a yttrium iron garnet (YIG) YIG/NiO/YIG trilayer on a gadolinium gallium garnet (GGG) substrate were detected using the inverse spin Hall effect (ISHE) in Pt. By studying samples with different NiO thicknesses, the spin diffusion length of NiO was determined to be ~3.8 nm at room temperature. Surprisingly, a large increase of the SSE signal was observed below 30 K, and the field dependence of the signal closely follows a Brillouin function for an S=7/2 spin. The increase of the SSE signal at low temperatures could thus be associated with the paramagnetic SSE from the GGG substrate. Besides, a broad peak in the SSE response was observed around 100 K. These observations are important in understanding the generation and transport properties of spin currents through magnetic insulators and the role of a paramagnetic substrate in spin current generation.},
doi = {10.1063/1.5116549},
journal = {AIP Advances},
number = 10,
volume = 9,
place = {United States},
year = {2019},
month = {10}
}

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