Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Poster 1
MA 19.16: Poster
Dienstag, 6. September 2022, 17:30–20:00, P2
Thermally generated spin transport in Fe3O4/NiO/Pt trilayers — •Johannes Demir1, Stefan Becker1, Paula Bunte1, Lennart Schwan2, Olga Kuschel3, Joachim Wollschläger3, and Timo Kuschel1 — 1Bielefeld University, Germany — 2Bielefeld University of Applied Sciences, Germany — 3Osnabrück University, Germany
We investigate the spin Seebeck effect (SSE) in Fe3O4/NiO/Pt trilayers by varying the thickness of the antiferromagnetic NiO layer from 0 to 20 nm. Furthermore, we compare the SSE voltage normalized to the temperature difference to literature [1] and to the experimentally detected heatflux [2]. The Fe3O4/NiO bilayer is grown in situ by molecular-beam epitaxy, while the Pt layer is deposited ex situ by DC sputtering. We see an enhanced spin current signal in 0.5 and 1.1 nm NiO on 48 nm Fe3O4 for both normlizations. Moreover, we recognize a deviation from the simple exponential behaviour above 9.5 nm NiO thickness indicating a generation of spin current in NiO detectable for larger NiO thickness. Additionally, we simulate the temperature gradient in Fe3O4 in an equivalent circuit model depending on the NiO thermal conductivity and the interface thermal conductances to examine the influence of the thermal depth profile of the NiO layer on the thermally induced spin current.
[1] L. Baldrati et al., Phys. Rev. B 98, 014409 (2018)
[2] A. Sola et al., Sci. Rep. 7, 46752 (2017)