Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 20: POSTER Ib
MA 20.37: Poster
Tuesday, March 17, 2015, 09:30–13:00, Poster A
Spin Seebeck effect in the GHz regime — •Franz Kramer1,2, Michael Schreier1,2, Hans Huebl1,3, Stephan Geprägs1, 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
In the spin Seebeck effect(SSE) experiments pure spin currents are generated via a thermal nonequilibrium at the interface between a ferromagnet and a normal metal. Time-resolved SSE experiments allow to gain insight into the microscopic origin of the spin current generation, but published results are inconclusive.1,2 We revisit our previous time-resolved Spin Seebeck effect studies1 and expand the frequency range of the temperature modulation up to several Gigahertz, corresponding to time constants below one nanosecond. This also gives insight into a potential thickness dependence of the spin Seebeck effect as reported earlier,3 as the thermal length (determining the volume in which the temperature modulation occurs) is of the order of some ten nanometers for GHz frequencies . We present our recent results and critically discuss them in view of the existing SSE models.
[1]Roschewsky et al., Appl. Phys. Lett 104, 202410 (2014),
[2]Agrawal et al.,Phys. Rev. B 89, 224414 (2014),
[3]Kehlberger et al., arXiv:1306.0784