Thin films of oriented tetragonal FePt particles separated by amorphous alumina have been
fabricated by electron beam evaporation. The ordering of the FePt particles without
coarsening can be tailored by annealing conditions. The value of coercivity of the annealed
film reached as high as 4.4 kOe. The perpendicular magnetic coercivity of the annealed film
was slightly larger than in-plane coercivity. Some of the tetragonal FePt particles were found
to have {111} twins and stacking faults. From our high-resolution electron microscopy …