Co–Zn ferrite films prepared by facing targets sputtering system for longitudinal recording layer

Abstract

Co–Zn ferrite films were deposited on glass ceramic disks of 1.89″ in diameter by the facing targets sputtering, and their read/write characteristics were evaluated using a merged type of MR head. Specimen disk with (1 1 1) orientation, Disk(1 1 1), possessed larger perpendicular magnetization component than disk with (311) orientation, Disk(3 1 1). The linear recording density D 50 increased with decrease of film thickness for both of these disks and the highest D 50 was 136 kfrpi for Disk(1 1 1) and 86 kfrpi for Disk(3 1 1), respectively. The reason why higher recording density was attained for Disk(1 1 1) seemed to be attributed to small 4 πM r δ and the significance of perpendicular magnetization component. The transition noise of Disk(1 1 1) was almost constant with the increase in recording density, while that for Disk(3 1 1) increased.