Monolayer of physically separated FePt islands with a tetragonal L1/sub 0/ structure produced by thermally created mass transport

A monolayer of physically separated FePt islands has been produced by thermally created mass transport of ultrathin FePt film, whereby formation of a magnetic layer composed of a two-dimensional arrangement of physically separated magnetic grains for decrease of magnetic coupling between the grains can be realized. The monolayer with [001] orientation was produced on [100] oriented MgO film. The produced monolayer had a small and uniform grain size and tetragonal L1/sub 0/ structure. Formation of granular film composed of a three-dimensional arrangement of L1/sub 0/-FePt ordered grains with [001] orientation in MgO film has been achieved by stacking the monolayer of FePt islands with MgO separation layers for high-density perpendicular media.