Finite Element Analysis on Critical Conditions for Heat-Induced Demagnetization in Head/Disk Sliding Continuous Contact

A finite element analysis of head/disk sliding continuous contact was performed to investigate the fields of temperature rise and thermal stress due to friction heat, and to develop the critical conditions for heat-induced demagnetization of the disk. Sliding contact was continued for a sufficient time to attain a relatively constant maximum temperature magnitude. The characteristic temperature increasing with whole sliding time was presented under various operating conditions. The demagnetization map for hard disk was developed by combining the simulated results together with available demagnetization temperature, a critical temperature magnitude at which occurrence of demagnetization is observed.