Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 20: POSTER Ib
MA 20.42: Poster
Tuesday, March 17, 2015, 09:30–13:00, Poster A
Dependence of the spin Hall magnetoresistance on ferromagnet surface termination and thickness — •Hannes Maier-Flaig1,2, Stephan Geprägs1, Rudolf Gross1, and Sebastian T.B. Goennenwein1,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Physik - Department, TU München, Garching, Germany — 3Nanosystems Initiative Munich, 80799 München, Germany
In recent years, considerable efforts have been made to understand the effect of interface properties on the transport of (spin) angular momentum across the interface between an insulating ferromagnet and a normal metal [1]. The recently discovered spin Hall magnetoresistance (SMR)[2] describes the impact of spin current flow on the resistance of the metal. We use magnetization orientation dependent SMR measurements to investigate the dependence of this effect in Y3Fe5O12|Platinum (YIG|Pt) heterostructures. In particular, we study the impact of surface termination and magnetic layer thickness on spin current transport. More specifically, we deposited Pt layers in-situ on epitaxially grown YIG films with thicknesses down to a single unit cell. The crystalline orientation (and thus the different interface termination), as well as the thickness of the YIG layers was systematically varied.
We discuss how the SMR depends on these parameters and address the impact of the interface termination.
This work was supported by the DFG via SPP 1538 (project no. GO 944/4).
Weiler et al., Phys. Rev. Lett. 111, 176601 (2013)
Nakayama et al., Phys. Rev. Lett 110, 206601 (2013)