Detection of hydrogen by the extraordinary Hall effect in CoPd alloys

Abstract

Effect of hydrogen adsorption on the extraordinary Hall phenomenon (EHE) in ferromagnetic CoPd films is studied as a function of composition, thickness, substrate and hydrogen concentration in atmosphere. Adsorption of hydrogen adds a positive term in the extraordinary Hall effect coefficient and modifies the perpendicular magnetic anisotropy with the respective changes in coercivity and remanence of hysteresis loops. Hydrogen sensitive compositions are within the Co concentration range 20% < x < 50% with the strongest response near the EHE polarity reversal point x_0 ~ 38%. Depending on the film composition and field of operation the EHE response of CoPd to low concentration hydrogen can reach hundreds percent, which makes the method and the material attractive for hydrogen sensing.

arXiv comment11 figures

References in corpus (4)

• Anomalous Hall Effect in Ferromagnetic Semiconductors in the Hopping Transport Regime
• Correlation between the Extraordinary Hall Effect and Resistivity
• Hall effect spintronics for gas detection
• Reversal of the extraordinary Hall effect polarity in thin Co/Pd multilayers

Cited by in corpus (7)

• Interpretation of experimental evidence of the topological Hall effect
• Kinetics of the lattice response to hydrogen absorption in thin Pd and CoPd films
• Resistivity testing of palladium dilution limits in CoPd alloys for hydrogen storage
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• Hydrogen (deuterium) dynamics and thermal stability in ion-irradiated platinum-hydride thin films synthesized at low temperature
• Percolation-Driven Magnetotransport due to Structural and Microstructural Evolution in Ultrathin Si/Fe Bilayers
• Hydrogen-Induced Sign Reversal in Magnetic Hysteresis Evolution of CoPd Alloys and Co/Pd Multilayers