Effect of a Ti Interlayer in Evaporated Co–Cr/Fe–Ni Double-Layer Film

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The effect of a Ti interlayer in an evaporated Co–Cr/Fe–Ni double-layer film on structural and magnetic properties and recording and playback characteristics has been investigated. The inplane coercivity of the Fe–Ni underlayer decreases, and the saturation magnetization and the perpendicular coercivity of the Co–Cr layer increase as a result of the presence of a Ti interlayer. The recording output voltage is found to increase as a result of the presence of a Ti interlayer from 10 to 40 nm thick. In films with an Fe–Ni underlayer having a small coercivity of about 80 A/m, the effect of the Ti interlayer as a spacing between the pole tip of a single-pole head and the Fe–Ni underlayer is observed: a higher output voltage and recording sensitivity, and a better overwrite S/N are obtained for films with a thinner Ti interlayer in the thickness range from 10 to 40 nm.