Static Magnetic Proximity Effect in Pt/NiFe2O4 and Pt/Fe Bilayers Investigated by X-Ray Resonant Magnetic Reflectivity

Kuschel T, Klewe C, Schmalhorst J-M, Bertram F, Kuschel O, Schemme T, Wollschläger J, Francoual S, Strempfer J, Gupta A, Meinert M, et al. (2015)
Physical Review Letters 115(9): 097401.

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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 is 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±0.1)  μB for Pt/Fe. For Pt/NiFe2O4 the asymmetry ratio drops below the sensitivity limit of 0.02  μB 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.
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Kuschel T, Klewe C, Schmalhorst J-M, et al. Static Magnetic Proximity Effect in Pt/NiFe2O4 and Pt/Fe Bilayers Investigated by X-Ray Resonant Magnetic Reflectivity. Physical Review Letters. 2015;115(9): 097401.
Kuschel, T., Klewe, C., Schmalhorst, J. - M., Bertram, F., Kuschel, O., Schemme, T., Wollschläger, J., et al. (2015). Static Magnetic Proximity Effect in Pt/NiFe2O4 and Pt/Fe Bilayers Investigated by X-Ray Resonant Magnetic Reflectivity. Physical Review Letters, 115(9): 097401.
Kuschel, T., Klewe, C., Schmalhorst, J. - M., Bertram, F., Kuschel, O., Schemme, T., Wollschläger, J., Francoual, S., Strempfer, J., Gupta, A., et al. (2015). Static Magnetic Proximity Effect in Pt/NiFe2O4 and Pt/Fe Bilayers Investigated by X-Ray Resonant Magnetic Reflectivity. Physical Review Letters 115:097401.
Kuschel, T., et al., 2015. Static Magnetic Proximity Effect in Pt/NiFe2O4 and Pt/Fe Bilayers Investigated by X-Ray Resonant Magnetic Reflectivity. Physical Review Letters, 115(9): 097401.
T. Kuschel, et al., “Static Magnetic Proximity Effect in Pt/NiFe2O4 and Pt/Fe Bilayers Investigated by X-Ray Resonant Magnetic Reflectivity”, Physical Review Letters, vol. 115, 2015, : 097401.
Kuschel, T., Klewe, C., Schmalhorst, J.-M., Bertram, F., Kuschel, O., Schemme, T., Wollschläger, J., Francoual, S., Strempfer, J., Gupta, A., Meinert, M., Götz, G., Meier, D., Reiss, G.: Static Magnetic Proximity Effect in Pt/NiFe2O4 and Pt/Fe Bilayers Investigated by X-Ray Resonant Magnetic Reflectivity. Physical Review Letters. 115, : 097401 (2015).
Kuschel, Timo, Klewe, Christoph, Schmalhorst, Jan-Michael, Bertram, Florian, Kuschel, Olga, Schemme, Tobias, Wollschläger, Joachim, Francoual, Sonia, Strempfer, Jörg, Gupta, Arunava, Meinert, Markus, Götz, Gerhard, Meier, Daniel, and Reiss, Günter. “Static Magnetic Proximity Effect in Pt/NiFe2O4 and Pt/Fe Bilayers Investigated by X-Ray Resonant Magnetic Reflectivity”. Physical Review Letters 115.9 (2015): 097401.
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Longitudinal spin Seebeck effect contribution in transverse spin Seebeck effect experiments in Pt/YIG and Pt/NFO.
Meier D, Reinhardt D, van Straaten M, Klewe C, Althammer M, Schreier M, Goennenwein ST, Gupta A, Schmid M, Back CH, Schmalhorst JM, Kuschel T, Reiss G., Nat Commun 6(), 2015
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