Influence of different substrates on potential magnetic degradation during slider-disk impact

Slider-disk impact causes flash temperature rise on the disk surface, which may lead to magnetic erasure. The substrates with different thermal conductivity and Young's modulus show different influences on the flash temperature rise and magnetic erasure. The simulation results show that substrates with low thermal conductivity and high Young's modulus will cause higher flash temperature rise and larger thermal stress. It is suggested to use the substrate or intermediate layer with high thermal conductivity in magnetic media in order to reduce the probability of magnetic erasure by slider-disk impact.