Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.9: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

Absence of an induced magnetic moment in Pt on Y₃Fe₅O₁₂ — Stephan Geprägs¹, •Matthias Opel¹, Sibylle Meyer¹, Fabrice Wilhelm², Katharina Ollefs², Andrei Rogalev², Sebastian T.B. Goennenwein¹, and Rudolf Gross^1,3 — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ²European Synchrotron Radiation Facility (ESRF), Grenoble, France — ³Physik-Department, TU München, Garching, Germany

The investigation of pure spin currents in ferromagnetic insulating Y₃Fe₅O₁₂ (YIG) is usually based on their conversion to charge currents in an adjacent metallic Pt layer via the inverse spin Hall effect. Recently, magnetotransport experiments in Pt/YIG heterostructures revealed a magnetoresistance (MR) effect in Pt which is interpreted controversially in terms of a novel spin-Hall MR [1] or a magnetic proximity MR [2]. To clarify this issue, we study the X-ray magnetic circular dichroism (XMCD) at the Pt L_2,3 edges in Pt/YIG [3]. Our data unambiguously show a negligible induced magnetic moment below (0.003±0.001) Bohr magnetons per Pt atom, in contrast to [2]. This suggests that a magnetic proximity effect cannot be responsible for the observed MR in Pt/YIG. Our data instead are fully consistent with the spin-Hall MR interpretation. – This work was supported by the ESRF via HE-3784, the Deutsche Forschungsgemeinschaft (DFG) via SPP 1538, and the German Excellence Initiative via NIM.

[1] H. Nakayama et al., Phys. Rev. Lett. 110, 206601 (2013).

[2] Y.M. Lu et al., Phys. Rev. Lett. 110, 147207 (2013).

[3] S. Geprägs et al., Appl. Phys. Lett. 101, 262407 (2012).