Thin films of oriented tetragonal FePt particles, separated by amorphous alumina, were prepared by means of electron-beam evaporation. Ordering of the particles, without coarsening, could be arranged by using suitable annealing conditions. The value of the coercivity of the annealed films reached values which were as high as 4400Oe. The perpendicular coercivity of the annealed films was slightly larger than the in-plane coercivity. Some of the tetragonal particles were found to contain {111} twins and stacking faults. High-resolution electron microscopic observations showed that the central regions of the ordered particles tended to have their c-axis perpendicular to the film plane.

Fabrication and Nanostructure of Oriented FePt Particles. B.Bian, D.E.Laughlin, K.Sato, Y.Hirotsu: Journal of Applied Physics, 2000, 87[9], 6962-4