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Effect of hydrogen adsorption on the extraordinary Hall phenomenon (EHE) inferromagnetic CoPd films is studied as a function of composition, thickness,substrate and hydrogen concentration in atmosphere. Adsorption of hydrogen addsa positive term in the extraordinary Hall effect coefficient and modifies theperpendicular magnetic anisotropy with the respective changes in coercivity andremanence of hysteresis loops. Hydrogen sensitive compositions are within theCo concentration range 20% < x < 50% with the strongest response near the EHEpolarity reversal point x_0 ~ 38%. Depending on the film composition and fieldof operation the EHE response of CoPd to low concentration hydrogen can reachhundreds percent, which makes the method and the material attractive forhydrogen sensing.

Detection of hydrogen by the extraordinary Hall effect in CoPd alloys