Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 27: Magnetic Thin Films II of 2

MA 27.5: Vortrag

Mittwoch, 13. März 2013, 16:00–16:15, H3

Investigation of induced Pt magnetic polarization in Pt/Y₃Fe₅O₁₂ bilayers — •Sibylle Meyer¹, Stephan Geprägs¹, Matthias Opel¹, Stephan Altmannshofer¹, Fabrice Wilhelm², Andrei Rogalev², Rudolf Gross^1,3, and Sebastian T. B. Goennenwein¹ — ¹Walther Meißner Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ²European Synchrotron Research Facility (ESRF), Grenoble, France — ³Physik-Department, Technische Universität München, Garching, Germany

The detection of spin currents is often based on the interconversion of spin and charge currents in a metallic Pt layer, taking advantage of the inverse spin Hall effect. However, for an unambiguous interpretation the presence of a static magnetic proximity effect, as it is well established in ferromagnetic metal/Pt heterostructures, has to be taken into account. So far, no information on such a proximity effect is available for ferromagnetic insulator/Pt heterostructures. Using X-ray magnetic circular dichroism (XMCD) measurements, we explore the possible existence of induced magnetic moments in thin Pt films deposited onto the ferrimagnetic insulator Y₃Fe₅O₁₂. Our data shows that if present at all, the induced moment in Pt is small. Integrating the XMCD signal allows to estimate an upper limit for the induced Pt magnetic polarization of (0.003 ± 0.001) µ_B per Pt atom [1]. This work was supported by the ESRF via HE-3784, by the DFG via SPP 1538, and the German Excellence Initiative via NIM.

[1] S. Geprägs et al., Appl. Phys. Lett., submitted (2012); arXiv:1211.0916.