Static magnetic proximity effect in Pt/Ni1-xFex bilayers investigated by x-ray resonant magnetic reflectivity
Autor(en): | Klewe, C. Kuschel, T. Schmalhorst, J. -M. Bertram, F. Kuschel, O. Wollschlaeger, J. Strempfer, J. Meinert, M. Reiss, G. |
Stichwörter: | ABSORPTION; CIRCULAR-DICHROISM; CO/PT MULTILAYERS; FILMS; IRON; LAYERS; Materials Science; Materials Science, Multidisciplinary; MOMENTS; NI/PT MULTILAYERS; Physics; Physics, Applied; Physics, Condensed Matter; SCATTERING; SUPERLATTICES | Erscheinungsdatum: | 2016 | Herausgeber: | AMER PHYSICAL SOC | Journal: | PHYSICAL REVIEW B | Volumen: | 93 | Ausgabe: | 21 | Zusammenfassung: | 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 delta and absorption beta across the Pt L-3-absorption edge. |
ISSN: | 24699950 | DOI: | 10.1103/PhysRevB.93.214440 |
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geprüft am 13.05.2024