Regensburg 2013 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 22: Poster II
DF 22.65: Poster
Friday, March 15, 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. Gross1,3, A. Gupta2, Y.-T. Chen4, G.E.W. Bauer4,5, H. Nakayama5, E. Saitoh5,6, 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.