Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: POSTER Ib
MA 20.28: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Spin pumping inverse spin Hall effect and spin transfer torque ferromagnetic resonance in NiFe/Pt and NiFe/Ta bilayers — •Islinger Robert, Obstbaum Martin, Härtinger Markus, and Back Christian H. — Institute for Experimental and Applied Physics, University Regensburg, 93040 Regensburg, Germany
Spin pumping in NiFe/normal metal bilayers together with the inverse spin Hall effect (SP-ISHE) constitutes a reliable method for determining spin Hall angles αSH [1]. Another method to determine αSH is the spin transfer torque ferromagnetic resonance (STT-FMR) technique recently introduced by Liu et al for ferromagnet/normal metal bilayers [2,3]. Whereas for platinum (Pt) both SP-ISHE and STT-FMR yield consistent results for tantalum (Ta) the two methods are contradictory. We present an extensive study of SP-ISHE and STT-FMR for both Pt and Ta. The two methods will be explained in detail and possible physical explanations for conflicting results will be discussed. [1] M. Obstbaum et al., Phys. Rev. B 89, 060407 (R) (2014) [2] L. Liu et al., Phys. Rev. Lett. 106, 036601 (2011) [3] L. Liu et al., Science 336, 555 (2012)