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MA: Fachverband Magnetismus
MA 57: Posters Magnetism II
MA 57.8: Poster
Donnerstag, 19. März 2020, 15:00–18:00, P3
Spin Seebeck effect in NiFe2O4 thin films deposited on differently doped Nb:SrTiO3(001) substrates — •Tobias Peters1, Oliver Ritter1, Jannis Thien2, Jari Rodewald2, Joachim Wollschläger2, Ronja Heinen3, Martina Müller3,4, and Timo Kuschel1 — 1Center for Spinelectronic Materials and Devices, University of Bielefeld, Germany — 2Center of Physics and Chemistry of New Materials, Osnabrück University, Germany — 3Peter Grünberg Institut, Forschungszentrum Jülich, Germany — 4Technical University of Dortmund, Germany
We investigated the spin Seebeck effect (SSE) in Pt/NiFe2O4 bilayers grown on differently doped Nb:SrTiO3(001) (STO) substrates and studied the influence of deposition techniques. The nickel ferrite (NFO) has been deposited in thicknesses of 30nm via magnetron sputtering1, molecular beam epitaxy2 and pulsed laser deposition3 on STO substrates with Nb content of 0%, 0.05% and 0.5%. SSE measurements have been performed, based on the normalization of the SSE driven electrical field in the Pt to the applied heat flux instead to the temperature difference, to avoid uncertainties from varying thermal conductivities between sample and setup [1]. For the NFO films on doped STO substrates we found SSE magnitudes comparable to the SSE in NFO on MgO(001) independent of the deposition technique. Only differences in the signal-to-noise ratio could be connected to the choice of the substrate.
[1] A. Sola et al., Sci. Rep. 7, 46752 (2017)