Abstract
The magnetooptical (MO) properties of hydrogenated Fe∕Pd and Co∕Pd bilayers were studied as a function of the H2 pressure. For samples with a Pd overlayer thickness 5.3nm and Fe film thickness in the range of 4.0–11.0nm, the fractional change in MO response under hydrogen loading, ΔθK∕θK0, increases approximately 12%, independent of the Fe film thickness. For H2 pressures less than PH2=25Torr, the enhancement obeys Sievert’s law (ΔθK∕θK0∝PH21∕2). Thicker Pd overlayers increase the MO enhancement, with remarkably large enhancement of 50% for a Fe(4.1nm)∕Pd(10.0nm) sample. Because ΔθK∕θK0 is independent of the Fe thickness, this effect results from a change in the optical properties of the Pd overlayer. This was confirmed by vibrating sample magnetometry. In contrast, no effect is observed in the Co∕Pd bilayers, presumably due to a small amount Co interdiffusion that prevents the Pd from absorbing H2.
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