THIN FILM MAGNETIC PLAYBACK HEAD

摘要

PURPOSE:To improve a magnetic shielding effect and playback sensitivity and to make the magneto striction of thin magnetic shielding films of a magneto-resistance effect element to nearly zero by constituting said thin films of a ternary amorphous alloy which consists essentially of cobalt and contains hafnium and niobium. CONSTITUTION:The above-described 1st thin magnetic shielding film 3 and the 2nd thin magnetic shielding film 7 consist of a thin film of a ternary amorphous alloy consisting of Co-Hf-Nb and is obtd. by regulating the respective contents in the alloy to 91.1atom% Co, 2.2atom% Hf and 6.7atom% Nb and heat-treating the alloy in a rotating magnetic field. The treating conditions thereof are 300- 400 deg.C temp., 10-20rpm rotating speed and >=100Oe intensity of the magnetic field and >=3hr treating time. The anisotropic magnetic field is decreased to about 4Oe by such treatment.