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L10 (CuAu(I)-type) ordered FePd as well as FePt and CoPt, due to their highmagnetic anisotropy, are candidate materials for future ultra-high densitymagnetic recording. Atomic diffusion governs the structural relaxation andassociated changes in the physical and magnetic properties in these alloys.Such processes involve diffusion paths of a few angstroms. In developing modernstorage devices it is indispensable to understand these processes. Neutronreflectometry (NR) and Synchrotron M\"ossbauer Reflectometry (SMR) are suitablenon destructive methods to study self-diffusion in a chemically homogenousisotope multilayer with diffusion lengths of the order of a few angstroms. Fromthe diffusion parameters obtained from NR and SMR evaluation we determinedactivation energies (Q) and preexponent factors (D0) for the distinctenvironment in the FePd samples. We obtained the highest activation energy(1.82\pm0.38 eV)and lowest preexponential factor((5.76\pm0.35)*10-14 m2/s) forthe ordered L10 as oppose to the iron rich regions were the activation energy(1.48\pm0.26 \pmV) found to be lowest and the preexponential factor the highest((1.01\pm0.61)*10-13 m2/s).

Self-Diffusion of Iron in L10 FePd film - as revealed by reflectometric methods