Abstract
Amorphous Tb-Fe films were prepared on thin carbon film and glass substrates by RF sputtering method. The films were irradiated with pulsed Ar laser beam, the energy range of which was that commonly adopted for thermo-magnetic recording. Thermal effects were studied mainly by transmission electron microscopy. The thermally influenced area depended largely on the film thickness over the range from 200 to 2000 Å. he structure of the irradiated areas changed from amorphous to crystalline, while magnetization of the corresponding areas turned from perpendicular to in-plane orientation. In a 500 Å Tb30Fe70 film on a carbon film substrate a circular area of 2.5 μm in diameter was crystallized by one 4 mW pulse of 1 μs. The damage was more evident in thinner films.
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