Regensburg 2013 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 22: Poster II

DF 22.65: Poster

Freitag, 15. März 2013, 10:30–13:30, Poster D

Quantitative analysis of the spin Hall magnetoresistance innormal metal/ferromagnetic insulator hybrids — •F. Witek¹, S. Meyer¹, M. Althammer², S. Geprägs¹, M. Opel¹, R. Gross^1,3, A. Gupta², Y.-T. Chen⁴, G.E.W. Bauer^4,5, H. Nakayama⁵, E. Saitoh^5,6, and S.T.B. Goennenwein¹ — ¹Walther-Meißner-Institut, BAdW, Garching, Germany — ²MINT Center, U. of Alabama, Tuscaloosa, USA — ³Fakultät für Physik, TU München, Germany — ⁴Kavli Institute of NanoScience, Delft, The Netherlands — ⁵Institute for Materials Research, Tohoku U., Sendai, Japan — ⁶The Advanced Science Research Center, JAEA, Tokai, Japan

Pure spin currents are a fascinating manifestation of spin physics in the solid state. We here report on a recently discovered magnetoresistance effect, arising from spin current flow across NM/FM interfaces. We observe this so-called spin Hall magnetoresistance (SMR) in Pt/Y₃Fe₅O₁₂ (Pt/YIG), Pt/nonferromagnetic metal/YIG, and Pt/Fe₃O₄ hybrid structures. The SMR effect stems from non-equilibrium spin transfer from the magnetic insulator into the Pt, in combination with spin Hall/inverse spin Hall effect. The SMR therefore characteristically depends on the orientation of the magnetization in the adjacent ferromagnet as observed in experiment. We show that the SMR is qualitatively different from the conventional anisotropic magnetoresistance effect arising in magnetic metals, and utilize the SMR to quantify the spin Hall angle and the spin diffusion length in the Pt layers. Financial support by the DFG via SPP 1538 SpinCAT and Nanoinitiative Munich (NIM) is gratefully acknowledged.