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The effects of hydrogen (H2) and deuterium (D2) absorption were studied intwo Co/Pd multilayers with perpendicular magnetic anisotropy (PMA) usingpolarized neutron reflectivity (PNR). PNR was measured in an external magneticfield H applied in the plane of the sample with the magnetization M confined inthe plane for {\mu}_o H= 6.0 T and partially out of plane at 0.65 T. Nominalthicknesses of the Co and Pd layers were 2.5 {\AA} and 21 {\AA}, respectively.Because of these small values, the actual layer chemical composition,thickness, and interface roughness parameters were determined from the nuclearscattering length density profile ({\rho}_n) and its derivative obtained fromboth x-ray reflectivity and PNR, and uncertainties were determined using MonteCarlo analysis. The PNR {\rho}_n showed that although D2 absorption occurredthroughout the samples, absorption in the multilayer stack was modest (0.02 Dper Pd atom) and thus did not expand. Direct magnetometry showed that H2absorption decreased the total M at saturation and increased the component of Min the plane of the sample when not at saturation. The PNR magnetic scatteringlength density ({\rho}_m) revealed that the Pd layers in the multilayer stackwere magnetized and that their magnetization was preferentially modified uponD2 absorption. In one sample, a modulation of M with twice the multilayerperiod was observed at {\mu}_o H= 0.65 T, which increased upon D2 absorption.These results indicate that H2 or D2 absorption decreases both the PMA andtotal magnetization of the samples. The lack of measurable expansion duringabsorption indicates that these changes are primarily governed by modificationof the electronic structure of the material.

Effects of hydrogen/deuterium absorption on the magnetic properties of Co/Pd multilayers