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Irradiation-induced enhancement of Fe and Al magnetic polarizations in Fe60Al40 films

  • The rise of Fe magnetic moment, changes in Al electronic structure and a variation of Al magnetic polarization in thin films of transition metal aluminide Fe60Al40 have been probed through the order-disorder phase transition by soft X-ray absorption spectroscopy and X-ray resonant magnetic reflectivity in the extreme ultraviolet regime. In a course of the transition induced by 20 keV Ne+ irradiation with low fluences (1014 ions·cm-2), X-ray magnetic circular dichroism spectra taken at the Fe L2,3 absorption edges at room and low temperatures revealed a pronounced increase of Fe 3d states spin-polarization. X-ray resonant magnetic reflectivity applied to the Al L2,3 and Fe M2,3 edges allowed to detect the magnetic polarization of Al atoms in the films. The changes in Al electronic structure have been seen by alteration of Al K edge X-ray absorption near edge structure. A difference in anisotropy fields for films before and after irradiation has been observed by element-specific hysteresis loops recorded at low temperatures in absorption and reflection geometries at the Fe L2,3 and M2,3 edges, respectively. An attempt to reduce the top oxide layer by an inductively coupled hydrogen plasma has shown a possibility to recover the chemically ordered phase.

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Author:Alevtina Smekhova, Thomas Szyjka, Enrico La Torre, Katharina Ollefs, Benedikt EggertORCiD, Birte Coester, Fabrice WilhelmORCiD, Rantej Bali, Jürgen Lindner, A. Rogalev, Daniel Maria Többens, Eugen Weschke, Chen Luo, Kai Chen, Florin Radu, Carolin Schmitz-AntoniakORCiD, Heiko Wende
URN:urn:nbn:de:kobv:526-opus4-18381
DOI (Version of Record):https://doi.org/10.1088/1367-2630/ad1497
ISSN:1367-2630
Parent Title (English):New Journal of Physics
Publisher:Institute of Physics Publishing (IOP)
Document Type:Article
Language:English
Year of Publication:2024
Publishing Institution:Technische Hochschule Wildau
Release Date:2024/02/21
Tag:XANES; XMCD; chemical disorder; ion-irradiation; plasma treatment
Volume:26
Article Number:023036
Source:A Smekhova et al 2024 New J. Phys. 26 023036
Faculties an central facilities:Fachbereich Ingenieur- und Naturwissenschaften
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 621 Angewandte Physik
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International
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