Hyperfine fields and magnetic anisotropy in Fe1000−x Gd x thin films and Fe80−x GdxB20(0≤x≤24) thin films and ribbons

The Mossbauer measurements performed on Fe100−xGd x thin films and on Fe80−xGd x B20 both as thin films and ribbons show a dependence of the spins orientation and 〈Hhyp〉 versus temperature, Gd content and preparation conditions. Increasing the Gd content, the initial low anisotropy disappears and 〈Hhyp〉 decreases. A sharp increase of the anisotopy with temperature in ribbons with low Gd concentration is evidenced.