Thermal Stability of Perpendicular and Longitudinal Recorded Information

Abstract

Abstract---The decay times of information recorded on perpendicular and longitudinal recording media were measured with a commercial MR head. We confirmed that the recording information of both types of media decayed with time. Longitudinal recording media showed a large time decay at higher linear densities. caused by an increased demagnetizing field. On the other hand, perpendicular media showed a large time decay at low densities. We produced a triple-layered perpendicular medium (CoCr19PtTaNb /paramagnetic buffer layer/soft magnetic underlayer) to inhibit thermal fluctuations at low densities so as not to decrease the SNR.