We report on the reversible change of the magneto-optical Kerr effect (MOKE) in Pd covered magnetic thin films by controlling H2 absorption. After H2 exposure, the extinction angle of MOKE was shifted and correspondingly the Kerr intensity was significantly increased. When properly choosing the analyzer angle, we obtained large enhancement of 40%, 35% and 50-70% for Pd/Fe, Pd/Co and Pd/Ni bilayers, respectively. The time-dependence of this H2 absorption effect on MOKE was investigated. The reversibility of MOKE enhancement was demonstrated in Pd/Ni bilayer by multiple cycles (at least 4 times) of H2 absorption and desorption. These observations reveal the universal responses when combining the hydrogenated Pd layer with a magnetic thin film, and can be applied in various magnetic materials.
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