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Magnetometry and neutron scattering have been used to study the magneticproperties of pressure graded Co/Pd multilayers. The grading of the multilayerstructure was done by varying the deposition pressure during sputtering of thesamples. Magnetic depth profiling by polarized neutron reflectometry directlyshows that for pressure-graded samples, the magnetization changes significantlyfrom one pressure region to the next, while control samples sputtered atuniform pressure exhibit essentially uniform magnetic depth profiles.Complementary magnetometry results suggest that the observed graded magneticprofiles are due in part to a decrease in saturation magnetization for regionsdeposited at progressively higher pressure. Increased deposition pressure isshown to increase coercivity, and for graded samples, the absence of discretesteps in the hysteresis loops implies exchange coupling among regions depositedat different pressures.

Direct Observation of Magnetic Gradient in Co/Pd Pressure-Graded Media