Ballistic material transport in HAMR head-disk interface

Smear is a key issue hindering the reliability of HAMR drives. Under ultra-low spacing, the random thermal motions by particles can lead to a smear generation on the head. To study this phenomenon, we began by reducing the complexity of the Head-disk interface (HDI) by considering it as a three-body problem. Then, using a Lennard-Jones potential, we calculated the interaction energy for a particle that eventually forms smear. Finally, using Kramer’s rate theory, we calculated the rate of transport of particles from the disk to the head.