Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 97: Spincaloric Transport I (organized by MA)
TT 97.1: Vortrag
Donnerstag, 3. April 2014, 16:45–17:00, HSZ 403
Spin Hall magnetoresistance in ferromagnetic insulator/normal metal hybrids — •M. Althammer1, S. Meyer1, S. Geprägs1, M. Opel1, R. Gross1,2, and S. T. B. Goennenwein1 — 1Walther-Meißner-Institut, BAdW, Germany — 2Physik-Department, Technische Universität München, Germany
Pure spin currents, i.e. the net flow of spin angular momentum without an
accompanying charge current, represent a new paradigm for spin transport and
spintronics. We have experimentally studied a new type of magnetoresistance
effect, which arises from the interaction of charge and spin current flows in
ferromagnetic insulator/normal metal hybrid structures. In more detail, we
measured the resistance of yttrium iron garnet(YIG)/Pt, YIG/nonferromagnet/Pt,
nickel ferrite/Pt, and magnetite/Pt hybrid structures as a function of the
magnitude and the orientation of an external magnetic field. The resistance
changes observed can be quantitatively traced back to the combined action of
spin Hall and inverse spin Hall effect in the Pt metal layer, and are thus
termed spin Hall magnetoresistance (SMR) [1,2]. We show that the SMR is qualitatively
different from the conventional anisotropic magnetoresistance effect arising in
magnetic metals and is not due to a static proximity magnetization in Pt, as proposed by Huang et al. [3]. Financial support by the DFG via SPP 1538 (project no. GO 944/4) and the Nanoinitiative Munich (NIM) is gratefully acknowledged.
[1] Nakayama et al., PRL, 110, 206601 (2013)
[2] Althammer et al., PRB, 87, 224401 (2013)
[3] Huang et al., PRL, 109, 107204 (2012)