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

Chen, Yizhang; Cogulu, Egecan; Roy, Debangsu; Ding, Jinjun; Mohammadi, Jamileh Beik; Kotula, Paul G.; Missert, Nancy A.; Wu, Mingzhong; Kent, Andrew D.

doi:10.1063/1.5116549

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

Journal Article · Fri Oct 25 00:00:00 EDT 2019 · AIP Advances

DOI:https://doi.org/10.1063/1.5116549· OSTI ID:1575253

^[1]; Cogulu, Egecan ^[1]; Roy, Debangsu ^[1]; Ding, Jinjun ^[2]; Mohammadi, Jamileh Beik ^[1]; ^[3]; Missert, Nancy A. ^[3]; Wu, Mingzhong ^[2]; Kent, Andrew D. ^[1]

New York Univ., New York, NY (United States)
Colorado State Univ., Fort Collins, CO (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: IARPA; USDOE

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1575253

Alternate ID(s):: OSTI ID: 1571835

Report Number(s):: SAND--2019-13897J; 681470

Journal Information:: AIP Advances, Journal Name: AIP Advances Journal Issue: 10 Vol. 9; ISSN 2158-3226

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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