Faraday effect of oxidized permalloy nanofilms upon hydrogenation

[Display omitted] •Magneto-optical Pt-covered oxidized permalloy nanofilms are proposed for hydrogen detection.•Hydrogenation of NiFeOx/Pt caused a significant change of both optical and magneto-optical spectra, and this change was nonreversible in room air.•The magneto-optical response due to the r...

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Bibliographic Details
Published in:Applied surface science 2023-03, Vol.613, p.155937, Article 155937
Main Authors: Kulikova, Daria P., Afanasyev, Konstantin N., Baryshev, Alexander V.
Format: Article
Language:English
Subjects:
Hydrogen sensor
Magnetic oxide
Magneto-optics
Permalloy
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Summary:[Display omitted] •Magneto-optical Pt-covered oxidized permalloy nanofilms are proposed for hydrogen detection.•Hydrogenation of NiFeOx/Pt caused a significant change of both optical and magneto-optical spectra, and this change was nonreversible in room air.•The magneto-optical response due to the reduction reaction has been proved to accumulate in a multi-pass regime, thus demonstrating nonreciprocal “gasogyrochromism” of oxidized permalloy nanofilms. Spectra of oxidized permalloy nanofilms were studied when subjecting them to hydrogenation. In contrast to the usual change in transmittance (optical constants) inherent to gasochromic metal oxides, we demonstrate changes in optical gyrotropy of oxidized permalloy/platinum bilayers. Hydrogenation of the bilayers caused changes in both the spectral shape and magnitude of the wavelength dependence of the Faraday rotation. The observed transformations were proved to have the nonreciprocal nature, thus demonstrating “gasogyrochromism” of the magnetic oxides under study.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2022.155937