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TT: Fachverband Tiefe Temperaturen

TT 116: Spintronics (incl. Quantum Dynamics) (jointly with MA, HL)

TT 116.9: Vortrag

Freitag, 20. März 2015, 11:45–12:00, EB 202

Spin pumping experiments in Gadolinium Iron Garnet/Pt thin films — Johannes Lotze¹, •Kathrin Ganzhorn¹, Stephan Geprägs¹, Francesco Della Coletta¹, Rudolf Gross^1,2,3, and Sebastian T. B. Goennenwein^1,3 — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ²Physik-Department, TU München, Garching, Germany — ³Nanosystems Initiative Munich, München, Germany

Magnetically compensated rare earth garnets, such as Gadolinium Iron Garnet (Gd₃Fe₅O₁₂, GdIG), exhibit a pronounced temperature dependence of the sublattice magnetizations, leading to a magnetization compensation temperature T_{comp, M}. The investigation of spin currents in GdIG/Pt heterostructures thus can give important insight into the processes involved in the spin current generation in ferrimagnetic insulator/Pt bilayers. Temperature dependent spin Seebeck effect experiments have recently been performed in GdIG/Pt thin film samples [1], revealing two sign changes of the spin Seebeck voltage, a first one at T_{comp, M} and a second one at a lower temperature. We have performed microwave heating induced spin Seebeck together with spin pumping measurements as a function of temperature in doped GdIG/Pt heterostructures. Our experiments confirm the temperature dependent evolution of the spin Seebeck voltage reported in Ref. [1]. We critically discuss this evolution and compare it to the temperature dependence of the spin pumping voltage observed.

Financial support by DFG via SPP 1538 is gratefully acknowledged.

[1] S. Geprägs et al., arXiv 1405.4971 (2014)