Quantitative Disentanglement of the Spin Seebeck, Proximity-Induced, and Ferromagnetic-Induced Anomalous Nernst Effect in Normal-Metal-Ferromagnet Bilayers

Autor(en): Bougiatioti, Panagiota
Klewe, Christoph
Meier, Daniel
Manos, Orestis
Kuschel, Olga 
Wollschlaeger, Joachim 
Bouchenoire, Laurence
Brown, Simon D.
Schmalhorst, Jan-Michael
Reiss, Guenter
Kuschel, Timo 
Stichwörter: Physics; Physics, Multidisciplinary; XMAS BEAMLINE
Erscheinungsdatum: 2017
Herausgeber: AMER PHYSICAL SOC
Journal: PHYSICAL REVIEW LETTERS
Volumen: 119
Ausgabe: 22
Zusammenfassung: 
We identify and investigate thermal spin transport phenomena in sputter-deposited Pt/NiFe2Ox (4 >= x >= 0) bilayers. We separate the voltage generated by the spin Seebeck effect from the anomalous Nernst effect (ANE) contributions and even disentangle the ANE in the ferromagnet (FM) from the ANE produced by the Pt that is spin polarized due to its proximity to the FM. Further, we probe the dependence of these effects on the electrical conductivity and the band gap energy of the FM film varying from nearly insulating NiFe2O4 to metallic Ni33Fe67. A proximity-induced ANE could only be identified in the metallic Pt/Ni33Fe67 bilayer in contrast to Pt/NiFe2Ox (x > 0) samples. This is verified by the investigation of static magnetic proximity effects via x-ray resonant magnetic reflectivity.
ISSN: 00319007
DOI: 10.1103/PhysRevLett.119.227205

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