NOISE AND DELTA-M-PERPENDICULAR-TO ANALYSIS OF A CR-RICH CO-CR PERPENDICULAR MEDIUM FOR AN MR HEAD

The medium noise in a Cr-rich Co-Cr alloy perpendicular medium was inv estigated by using an MR head designed for longitudinal recording. Med ium with a Cr content of 28 at.% showed a high crystalline orientation and a low write-demagnetization effect. The signal-to-noise ratio (S/ N) of the medium was higher than that of conventional Co-Cr perpendicu lar media for inductive heads. The advantages of the medium derive fro m the large inter-particle perpendicular magnetic interaction (Delta M perpendicular to) of media, which increased linearly with the Cr cont ent, reaching a maximum value at 28 at.%. This strong interaction in t he medium results in a high S/N for a recording system using a single- layer perpendicular medium and an MR head.