Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 67: Poster 4
MA 67.15: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-OG3
Interface optimization for spin Hall magnetoresistance experiments — •Saki Matsuura1,2, Matthias Althammer1,2, Stephan Geprägs1, Hans Huebl1,2,3, and Rudolf Gross1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, TU München, Garching, Germany — 3Nanosystems InitiativeMunich (NIM), München, Germany
The concept of pure spin currents, i.e. the net flow of spin angular momentum without an accompanying charge current, triggered the discovery of interesting new effects. Among these the spin Hall magnetoresistance (SMR) is present in ferromagnetic insulator (FMI) and normal metal (NM) bilayers, originating from the combined action of spin Hall and inverse spin Hall effect in the NM. The experimental fingerprint of the SMR is a characteristic dependence of the NM’s resistivity on the magnetization orientation of the FMI. The SMR magnitude crucially depends on the transfer of a pure spin current accross the FMI/NM interface. We here systematically investigate the SMR in yttrium iron garnet (YIG)/Pt heterostructures, prepared by ex-situ and in-situ methods. To this end, we carried out angle-dependent magnetoresistance measurements and analyzed the SMR as a function of temperature and magnetic field strength. Our results show that for a sizeable SMR in ex-situ samples a suitable cleaning process of the YIG surface prior to the deposition of the Pt is crucial.