Magnetic Properties of Amorphous (Tb_<1-x>Gd_x)_<30>Fe_<70> Thin Films

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Amorphous (Tb_<1-x>Gd_x)_<30>Fe_<70> thin films were prepared at various substrate temperatures (T_<sub>) and with various thicknesses, and their magnetic properties were investigated. The films prepared at T_<sub>=77 K show only in-plane anisotropy, and those prepared at T_<sub>=473 K only perpendicular anisotropy. The films prepared at T_<sub>=300 K are found to simultaneously have two components of anisotropy, the in-plane and the perpendicular. Since the absolute value of K_u decreases linearly with the fraction of Gd substitution for Tb, the single-ion anisotropy of Tb is considered to be closely connected with the anisotropy of these films. Thickness dependence of perpendicular anisotropy and that of angular dispersion of the easy axis of the local anisotropy of amorphous Tb_<15>Gd_<15>Fe_<70> films suggest the formation of small microcrystals in the films to produce the perpendicular anisotropy.
社団法人応用物理学会の論文
1991-08-15