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Condensed Matter > Materials Science

arXiv:1508.00379 (cond-mat)
[Submitted on 3 Aug 2015]

Title:Static magnetic proximity effect in Pt/Ni$_{1-x}$Fe$_x$ bilayers investigated by x-ray resonant magnetic reflectivity

Authors:Christoph Klewe, Timo Kuschel, Jan-Michael Schmalhorst, Florian Bertram, Olga Kuschel, Joachim Wollschläger, Jörg Strempfer, Markus Meinert, Günter Reiss
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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/Fe, Pt/Ni$_{33}$Fe$_{67}$, Pt/Ni$_{81}$Fe$_{19}$ (permalloy), and Pt/Ni bilayers. We demonstrate that a detailed analysis of the reflected x-ray intensity gives insight in the spatial distribution of the spin polarization of a non-magnetic 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. 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 magnetooptic parameters and allow identifying the optical dispersion $\delta$ and absorption $\beta$ across the Pt L3-absorption edge.
Subjects: Materials Science (cond-mat.mtrl-sci)
Cite as: arXiv:1508.00379 [cond-mat.mtrl-sci]
  (or arXiv:1508.00379v1 [cond-mat.mtrl-sci] for this version)
  https://doi.org/10.48550/arXiv.1508.00379
Journal reference: Phys. Rev. B 93, 214440 (2016)
Related DOI: https://doi.org/10.1103/PhysRevB.93.214440

Submission history

From: Christoph Klewe [view email]
[v1] Mon, 3 Aug 2015 11:34:32 UTC (395 KB)
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