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TT: Fachverband Tiefe Temperaturen

TT 63: Spincaloric Transport (joint session MA, TT, organized by MA)

TT 63.2: Vortrag

Donnerstag, 23. März 2017, 09:45–10:00, HSZ 403

Quantitative disentanglement of spin Seebeck, intrinsic anomalous Nernst, and proximity-induced anomalous Nernst effect in NM/FM bilayers — •Panagiota Bougiatioti¹, Christoph Klewe^1,2, Daniel Meier¹, Orestis Manos¹, Olga Kuschel³, Joachim Wollschläger³, Laurence Bouchenoire^4,5, Simon D. Brown^4,5, Jan-Michael Schmalhorst¹, Günter Reiss¹, and Timo Kuschel^1,6 — ¹CSMD, Physics Department, Bielefeld University, Germany — ²ALS, Berkeley, California, USA — ³Fachbereich Physik, Universität Osnabrück, Germany — ⁴XMaS, ESRF, Grenoble, France — ⁵University of Liverpool, UK — ⁶University of Groningen, The Netherlands

In this project, we investigate thermal transport phenomena by separating the anomalous Nernst effect (ANE) contribution (intrinsic and proximity-induced) from the spin Seebeck effect (SSE) voltage on sputter-deposited Pt/NiFe₂O_4−x samples. On one hand, we observe a distinct increase of the SSE with the increase of the bandgap energy and the decrease of conductivity, whereas the ANE decreases. On the other hand, a proximity-induced ANE could only be identified in the metallic Pt/Ni₃₃Fe₆₇ bilayer. This was verified by the investigation of static magnetic proximity effects via x-ray resonant magnetic reflectivity [1-3]. Further, we determined a maximum moment of 0.48 µ_B per spin-polarized Pt atom in the Pt/Ni₃₃Fe₆₇ bilayer.
[1] T. Kuschel et al., Phys. Rev. Lett. 115, 097401 (2015)
[2] T. Kuschel et al., IEEE Trans. Magn. 52, 4500104 (2016)
[3] C. Klewe et al., Phys. Rev. B 93, 214440 (2016)