Flash temperature induced magnetic degradation in high density magnetic recording

Slider disk impact, especially the impact with particles in between, genera tes flash temperatures at the contact area and creates thermal stress in th e magnetic layer of disk media. By modeling the effective magnetic fields o f the thermal stress and the thermal agitation, the flash temperature induc ed magnetic degradation is studied via micro-magnetic simulation. It is not iced that the recorded bit pattern can be fully erased near the area of the maximum thermal stress if the flash temperature approaches 673 K (grain si ze: 12 nm). The bit patterns with higher bit density corresponds to higher likelihood of data erasure if other conditions are the same. (C) 2000 Ameri can Institute of Physics. [S0021- 8979(00)84408-4].