Magnetic anisotropy in evaporated amorphous films of the ternary system Gdx(Fe1minus;yCoy)1minus;x

摘要

Magnetic anisotropy has been determined for evaporated amorphous films of Gdx(Fe1minus;yCoy)1minus;xwith 0.08x0.35 and 0.06y0.62. The anisotropy data were fitted with a dipolar equation of the formKu=Jthinsp;CijMiMjin whichCijis a dipolar coupling constant for theihyphen;jpair andMiandMjare sublattice magnetizations. The model satisfactorily described the experimental data for all films that were amorphous. The anisotropy could be attributed to pair ordering in which rare earthndash;transition metal pairs (Gdhyphen;Co) and Gdhyphen;Fe) contribute to inhyphen;plane anisotropy and rare earthndash;rare earth (Gdhyphen;Gd) and transition metalndash;transition metal (Fehyphen;Fe, Cohyphen;Co, and Fehyphen;Co) pairs contribute to perpendicular anisotropy. The Fehyphen;Co pairs were the strongest contributor to perpendicular anisotropy withCFehyphen;Co=2.809,CFehyphen;Fe=0.992, andCCohyphen;Co=0.660.