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arXiv:1411.0113 (cond-mat)
[Submitted on 1 Nov 2014 (v1), last revised 28 Aug 2015 (this version, v2)]

Title:Static magnetic proximity effect in Pt/NiFe2O4 and Pt/Fe bilayers investigated by x-ray resonant magnetic reflectivity

Authors:Timo Kuschel, Christoph Klewe, Jan-Michael Schmalhorst, Florian Bertram, Olga Schuckmann, Tobias Schemme, Joachim Wollschläger, Sonia Francoual, Jörg Strempfer, Arunava Gupta, Markus Meinert, Gerhard Götz, Daniel Meier, Günter Reiss
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Abstract:The spin polarization of Pt in Pt/NiFe2O4 and Pt/Fe bilayers is studied by interface-sensitive x-ray resonant magnetic reflectivity to investigate static magnetic proximity effects. The asymmetry ratio of the reflectivity was measured at the Pt L3 absorption edge using circular polarized x-rays for opposite directions of the magnetization at room temperature. The results of the 2% asymmetry ratio for Pt/Fe bilayers are independent of the Pt thickness between 1.8 and 20 nm. By comparison with ab initio calculations, the maximum magnetic moment per spin polarized Pt atom at the interface is determined to be $(0.6\pm0.1)\,\mu_{B}$ for Pt/Fe. For Pt/NiFe2O4 the asymmetry ratio drops below the sensitivity limit of $0.02\,\mu_{B}$ per Pt atom. Therefore, we conclude, that the longitudinal spin Seebeck effect recently observed in Pt/NiFe2O4 is not influenced by a proximity induced anomalous Nernst effect.
Comments: 5 pages, 5 figures
Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Cite as: arXiv:1411.0113 [cond-mat.mes-hall]
  (or arXiv:1411.0113v2 [cond-mat.mes-hall] for this version)
  https://doi.org/10.48550/arXiv.1411.0113
Journal reference: Phys. Rev. Lett. 115, 097401 (2015)
Related DOI: https://doi.org/10.1103/PhysRevLett.115.097401

Submission history

From: Timo Kuschel [view email]
[v1] Sat, 1 Nov 2014 13:02:54 UTC (2,659 KB)
[v2] Fri, 28 Aug 2015 14:04:07 UTC (2,659 KB)
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