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MA: Fachverband Magnetismus
MA 57: Posters Magnetism II
MA 57.6: Poster
Donnerstag, 19. März 2020, 15:00–18:00, P3
Thermally generated spin transport in Fe3O4/NiO/Pt trilayers — •Johannes Demir1, Stefan Becker1, Lennart Schwan2, Olga Kuschel3, Joachim Wollschläger3, and Timo Kuschel1 — 1Center for Spineletronic Materials and Devices, Bielefeld University, Germany — 2Bielefeld Institute for Applied Materials Research (BIfAM), Bielefeld University of Applied Sciences, Department of Engineering Sciences and Mathematics, Germany — 3Center of Physics and Chemistry of New Materials, Osnabrück 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 normalization of the SSE voltage to the temperature difference as well as to the experimentally detected heat flux [1]. The Fe3O4/NiO bilayer is grown in situ by molecular-beam epitaxy, while the Pt layer is deposited ex situ by DC sputtering. We discuss a possible enhancement of the spin-current signal in 1 nm NiO on 48 nm and 22 nm Fe3O4 for the temperature difference (as reported in literature [2]) as well as for the heat flux method. 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] A. Sola et al., Sci. Rep. 7, 46752 (2017)
[2] L. Baldrati et al., Phys. Rev. B 98, 014409 (2018)