Static magnetic proximity effect in Pt/Ni1−xFex bilayers investigated by x-ray resonant magnetic reflectivity

Klewe C, Kuschel T, Schmalhorst J-M, Bertram F, Kuschel O, Wollschläger J, Strempfer J, Meinert M, Reiss G (2016)
Physical Review B 93(21): 214440.

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Abstract
We present x-ray resonant magnetic reflectivity (XRMR) as a very sensitive tool to detect proximity induced interface spin polarization in Pt/FM heterostructures. Different XRMR experiments are carried out and the results are evaluated for their dependence on the magneto-optical depth profile, the photon energy, the optical parameters, and the ferromagnetic material.We demonstrate that a detailed analysis of the reflected x-ray intensity gives insight into the spatial distribution of the spin polarization of a nonmagnetic metal across the interface to a ferromagnetic layer. The evaluation of the experimental results with simulations based on optical data from ab initio calculations provides the induced magnetic moment per Pt atom in the spin-polarized volume adjacent to the ferromagnet. For a series with different ferromagnetic materials consisting of Pt/Fe, Pt/Ni33Fe67, Pt/Ni81Fe19 (permalloy), and Pt/Ni bilayers we find the largest spin polarization in Pt/Fe and a much smaller magnetic proximity effect in Pt/Ni. Additional XRMR experiments with varying photon energy are in good agreement with the theoretical predictions for the energy dependence of the magneto-optical parameters and allow identifying the optical dispersion δ and absorption β across the Pt L3-absorption edge.
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Klewe C, Kuschel T, Schmalhorst J-M, et al. Static magnetic proximity effect in Pt/Ni1−xFex bilayers investigated by x-ray resonant magnetic reflectivity. Physical Review B. 2016;93(21): 214440.
Klewe, C., Kuschel, T., Schmalhorst, J. - M., Bertram, F., Kuschel, O., Wollschläger, J., Strempfer, J., et al. (2016). Static magnetic proximity effect in Pt/Ni1−xFex bilayers investigated by x-ray resonant magnetic reflectivity. Physical Review B, 93(21): 214440.
Klewe, C., Kuschel, T., Schmalhorst, J. - M., Bertram, F., Kuschel, O., Wollschläger, J., Strempfer, J., Meinert, M., and Reiss, G. (2016). Static magnetic proximity effect in Pt/Ni1−xFex bilayers investigated by x-ray resonant magnetic reflectivity. Physical Review B 93:214440.
Klewe, C., et al., 2016. Static magnetic proximity effect in Pt/Ni1−xFex bilayers investigated by x-ray resonant magnetic reflectivity. Physical Review B, 93(21): 214440.
C. Klewe, et al., “Static magnetic proximity effect in Pt/Ni1−xFex bilayers investigated by x-ray resonant magnetic reflectivity”, Physical Review B, vol. 93, 2016, : 214440.
Klewe, C., Kuschel, T., Schmalhorst, J.-M., Bertram, F., Kuschel, O., Wollschläger, J., Strempfer, J., Meinert, M., Reiss, G.: Static magnetic proximity effect in Pt/Ni1−xFex bilayers investigated by x-ray resonant magnetic reflectivity. Physical Review B. 93, : 214440 (2016).
Klewe, Christoph, Kuschel, Timo, Schmalhorst, Jan-Michael, Bertram, Florian, Kuschel, Olga, Wollschläger, Joachim, Strempfer, Jörg, Meinert, Markus, and Reiss, Günter. “Static magnetic proximity effect in Pt/Ni1−xFex bilayers investigated by x-ray resonant magnetic reflectivity”. Physical Review B 93.21 (2016): 214440.
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