Effect of Hydrogen Gas on the FMR Absorption Amplitude of Pd/Co Layered Films

Thomas A. Schefer; Mikhail Kostylev

doi:10.1109/TMAG.2018.2843790

Effect of Hydrogen Gas on the FMR Absorption Amplitude of Pd/Co Layered Films

Thomas A. Schefer, Mikhail Kostylev

School of Physics, Mathematics and Computing

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

In this paper, we carry out a detailed investigation of a recently discovered effect of the increase in the ferromagnetic resonance (FMR) amplitude for cobalt-palladium layered films in the presence of hydrogen gas (H₂). We find that this effect is not correlated with the FMR peak shift in the presence of H₂ found previously. This follows from observation of a vanishing shift but a change in the amplitude of 69.5% for a sample having a 70 nm thick cobalt layer studied in this paper. The change in amplitude is found to be mainly due to the narrowing of the FMR linewidth, which has its origin in a change in the damping parameter $α $. The increase in the amplitude allows us to measure H₂ concentration in nitrogen as a carrier gas in a very broad range--from 0.05% to 70% with sensitivity higher than in our previous papers.

Original language	English
Article number	4001305
Journal	IEEE Transactions on Magnetics
Volume	54
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2018.2843790
Publication status	Published - Nov 2018

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title = "Effect of Hydrogen Gas on the FMR Absorption Amplitude of Pd/Co Layered Films",

abstract = "In this paper, we carry out a detailed investigation of a recently discovered effect of the increase in the ferromagnetic resonance (FMR) amplitude for cobalt-palladium layered films in the presence of hydrogen gas (H₂). We find that this effect is not correlated with the FMR peak shift in the presence of H₂ found previously. This follows from observation of a vanishing shift but a change in the amplitude of 69.5% for a sample having a 70 nm thick cobalt layer studied in this paper. The change in amplitude is found to be mainly due to the narrowing of the FMR linewidth, which has its origin in a change in the damping parameter $α $. The increase in the amplitude allows us to measure H₂ concentration in nitrogen as a carrier gas in a very broad range--from 0.05% to 70% with sensitivity higher than in our previous papers.",

keywords = "Ferromagnetic resonance (FMR), hydrogen gas sensing, palladium, perpendicular magnetic anisotropy (PMA)",

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AU - Schefer, Thomas A.

AU - Kostylev, Mikhail

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N2 - In this paper, we carry out a detailed investigation of a recently discovered effect of the increase in the ferromagnetic resonance (FMR) amplitude for cobalt-palladium layered films in the presence of hydrogen gas (H₂). We find that this effect is not correlated with the FMR peak shift in the presence of H₂ found previously. This follows from observation of a vanishing shift but a change in the amplitude of 69.5% for a sample having a 70 nm thick cobalt layer studied in this paper. The change in amplitude is found to be mainly due to the narrowing of the FMR linewidth, which has its origin in a change in the damping parameter $α $. The increase in the amplitude allows us to measure H₂ concentration in nitrogen as a carrier gas in a very broad range--from 0.05% to 70% with sensitivity higher than in our previous papers.

AB - In this paper, we carry out a detailed investigation of a recently discovered effect of the increase in the ferromagnetic resonance (FMR) amplitude for cobalt-palladium layered films in the presence of hydrogen gas (H₂). We find that this effect is not correlated with the FMR peak shift in the presence of H₂ found previously. This follows from observation of a vanishing shift but a change in the amplitude of 69.5% for a sample having a 70 nm thick cobalt layer studied in this paper. The change in amplitude is found to be mainly due to the narrowing of the FMR linewidth, which has its origin in a change in the damping parameter $α $. The increase in the amplitude allows us to measure H₂ concentration in nitrogen as a carrier gas in a very broad range--from 0.05% to 70% with sensitivity higher than in our previous papers.

KW - Ferromagnetic resonance (FMR)

KW - hydrogen gas sensing

KW - palladium

KW - perpendicular magnetic anisotropy (PMA)

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JO - Institute of Electrical and Electronics Engineers Transactions on Magnetics

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Effect of Hydrogen Gas on the FMR Absorption Amplitude of Pd/Co Layered Films

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