1992 年 16 巻 2 号 p. 261-264
The effects of N addition into Fe-Hf-O sputtered films on magnetic properties and structure were investigated. The addition of N to Fe93∼88Hf2∼3O5∼9 thin films was found ta decrease the coercivities (Hc) both at as-deposited state and after annealing at 773 K∼873 K because of decreasing grain size of α-Fe (bee phase). In particular, Fe85.1Hf2.1O5.5N7.3 films composed of phase with fine grain of about 150Å, γ'Fe4N and Hafnium Oxide Nitride, exhibited low coercivity of 64 A/m and high saturation magnetization (Bs) of about 1.7 T even after annealing at 873 K. Thus, this thin film with high Bs. low Hc and high thermal stability is expected to be used as magnetic head materials.