Highly ordered FePd and FePt nanostructures

In the present study we show two variations of the bottom-up approach. First our correlated structural and magnetic properties studies on epitaxial FePd films grown on (001) MgO will show that this particular system does exhibit perpendicular magnetic anisotropy and it is also nano-structured due to 3-dimensional growth mode on the chosen substrate. We also note here that the highly-ordered nanostructures embedded in the chemically disordered alloy film are magnetically coupled. We found that capping the films with a thin MgO layer significantly lowers interparticle coupling. For the FePt system we have used ion-implantation of Fe ions on epitaxial Pt films followed by rapid thermal treatments. We have achieved controlled nano-patterning, large perpendicular magnetic anisotropy and decoupled highly ordered nano-structures. We present our correlated structural (XRD, AFM, TEM) and magnetic (MFM, Kerr magnetometry) characterizations on the two systems studied. Our observations are useful to further understand magnetic anisotropy properties at the nano-scale for new media applications.