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TT: Fachverband Tiefe Temperaturen
TT 85: Spincaloric Transport II (organized by MA)
TT 85.8: Vortrag
Donnerstag, 3. April 2014, 11:30–11:45, HSZ 04
Static proximity investigations on Pt/NiFe2O4 and Pt/Fe bilayers using x-ray resonant magnetic reflectivity — •Timo Kuschel1, Christoph Klewe1, Jan-Michael Schmalhorst1, Florian Bertram2, Olga Schuckmann3, Tobias Schemme3, Joachim Wollschläger3, Arunava Gupta4, Gerhard Götz1, Daniel Meier1, and Günter Reiss1 — 1Bielefeld University, Germany — 2Lund University, Sweden — 3Osnabrück University, Germany — 4University of Alabama, Tuscaloosa Alabama, USA
When Pt is used to detect spin currents in an attached magnetic film via the inverse spin Hall effect, parasitic charge based effects can be induced due to spin polarization in Pt generated by static proximity. For example, in spin caloritronics the anomalous Nernst effect (ANE) can contribute to the longitudinal spin Seebeck effect (LSSE) signal when an out-of-plane temperature gradient is applied. In case of Pt/YIG Lu et al. [1] observed a spin polarization in Pt via XMCD, while Geprägs et al. [2] found no evidence for static proximity in Pt/YIG.
Recently, we have observed the LSSE in NiFe2O4 (NFO) thin films [3]. Now, we used x-ray resonant magnetic reflectivity (XRMR) to exclude the ANE. XRMR is interface sensitive and therefore, mainly independent of the Pt thickness, which makes it preferable over XMCD. For Pt/Fe we clearly detect an XRMR signal of some %, while for Pt/NFO we can exclude any effect within our detection limit of < 0.05 %.
[1] Y. M. Lu et al., Phys. Rev. Lett. 110, 147207 (2013)
[2] S. Geprägs et al., Appl. Phys. Lett. 101, 262407 (2012)
[3] D. Meier et al., Phys. Rev. B. 87, 054421 (2013)