Abstract
The effect of an annealing treatment of the Tb 0.3Dy 0.7Fe 2 nanocrystalline films formed by flash evaporation process on magnetic and magnetostrictive characteristics was investigated. An annealing treatment of a nanocrystalline film at 630 K for 10 h in a vacuum of 7×10 −4 Pa increased the crystal grains of below 5 nm to around 50 nm. Annealing treatment for up to 2 h increased the magnetostrictions from 300 to 1500 ppm. However, additional annealing induced marked oxidation of the film suppressing the increase in magnetization and decrease in magnetostriction. In a similar annealing treatment of a film with grain sizes 10–20 nm, marked increase in the grain size was not observed. Less oxidation effect by the annealing was found for the film with larger grains. Complex changes in magnetostriction with extended annealing treatment can be ascribed to the competitive processes including release of initial strains induced during film preparation, growth of crystal grains and oxidation by vacuum annealing treatment.
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