Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 3: Spin Hall Effects

MA 3.8: Talk

Monday, March 31, 2014, 11:15–11:30, HSZ 403

Experimental test of the spin mixing interface conductance concept — •Michael Schreier¹, Mathias Weiler¹, Matthias Althammer¹, Johannes Lotze¹, Matthias Pernpeintner¹, Sibylle Meyer¹, Hans Huebl¹, Rudolf Gross^1,2, Akashdeep Kamra^1,3, Jiang Xiao⁴, Yan-Ting Chen³, HuJun Jiao³, Gerrit E. W. Bauer^3,5, and Sebastian T. B. Goennenwein¹ — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, DE — ²Physik-Department, TU München, DE — ³Kavli Institute of Nanoscience, Delft University of Technology, NL — ⁴Department of Physics and State Key Laboratory of Surface Physics, Fudan University, CHN — ⁵Institute of Materials Research and WPI-AIMR, Tohoku University, JP

Spin pumping (SP), spin Hall magnetoresistance (SMR) and the spin Seebeck effect (SSE) originate from spin transfer across the interface between a ferromagnet and a normal metal. The spin mixing conductance g^↑↓ in particular determines the rate by which spin accumulation on one side of the interface can relax to the other. Until now, however, a comprehensive, quantitative experimental test of the spin mixing interface conductance concept has been missing. Here, we present an in-depth analysis and experimental study of SP, SMR and SSE experiments conducted on a series of YIG/Pt samples from which we extract the relevant spin transport parameters (spin diffusion length, spin Hall angle and g^↑↓). Our findings strongly support the spin mixing interface conductance concept, i.e. the purely spintronic nature of all three effects [Weiler et al., Phys. Rev. Lett. 111, 176601 (2013)].