Berlin 2015 – wissenschaftliches Programm
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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 Gross1,2,3, and Sebastian T. B. Goennenwein1,3 — 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 Tcomp, 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 Tcomp, 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)