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The continuous need towards improving the capacity of magnetic storagedevices requires materials with strong perpendicular magnetic anisotropy. FePd,CoPd and their Co(Fe)Pt counterparts very attractive candidate for suchpurposes. The magnetic properties of these films are largely dependent on theorientation and local distribution of the L10 FePd phase fraction which aremainly controlled by diffusion processes and involve diffusion paths of a fewangstroms. Highly ordered as well as disordered epitaxial isotope-periodic57FePd/natFePd (001) thin films were prepared by molecular-beam epitaxy onMgO(001) substrate. Short range diffusion of different phases in FePd thin filminduced by room temperature 130 keV He+ irradiation was investigated atfluences up to 30\times1015 ions/cm2. Conversion electron M\"ossbauerspectroscopy and synchrotron M\"ossbauer reflectivity experiments showed thatthe inter-atomic diffusion across 57FePd/natFePd interface occur mainly via theiron rich regions. The ratio of the diffusion length in the L10, fcc and ironrich structure are 1:1.4:5.6 respectively. Assuming that the diffusioncoefficient in the fcc phase is between the diffusion coefficient of the L10phase in the crystallographic c direction and perpendicular to it, thediffusion coefficient in the c-direction of the L10 phase is found more than1.9 times lower than in the a-b plane.

Self-Diffusion of Iron in L10 FePd films Upon He-irradiation (alternative title: An alternative for diffusion studies in isotopic FePd multilayers)