Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 64: Poster 1

MA 64.21: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-EG

Magneto-optic detection of spin Seebeck effect in Au/YIG and Cu/YIG bilayers at picosecond time scale — Johannes Kimling¹, Gyung-Min Choi², Jack T. Brangham³, •Tristan Matalla-Wagner⁴, Torsten Huebner⁴, Timo Kuschel^4,5, Fengyuan Yang³, and David G. Cahill¹ — ¹University of Illinois, Urbana, USA — ²Korea Institute of Science and Technology, Seoul, Korea — ³The Ohio State University, Columbus, USA — ⁴CSMD, Bielefeld University, Germany — ⁵University of Groningen, The Netherlands

A temperature gradient perpendicular to the plane of Y₃Fe₅O₁₂ (YIG) / Pt bilayers drives an out-of-plane spin current in the YIG and at the YIG/Pt interface (longitudinal spin Seebeck effect), which is injected into the Pt. The inverse spin Hall effect in Pt converts the spin current into a transverse charge current and, thus, a charge voltage can be measured. However, a magnetic proximity effect (MPE) in Pt can occur, that allows for the anomalous Nernst effect, which has the same symmetry as the LSSE and, therefore, can contribute to the measured voltage as a parasitic side effect. To detect the LSSE without any MPE side effects, additional techniques such as magneto-optic means can be applied. Here, we present LSSE measurements using the time-resolved magneto-optic Kerr effect. Our results indicate angular-momentum transfer across YIG/Cu and YIG/Au interfaces on a picosecond time scale [1].

[1] J. Kimling et al., arxiv: 1608.00702