The dependence of hard transition shift on medium velocity

The experimental measurements of hard transition shift (HTS), obtained for a set of different velocities of the magnetic medium, indicate that HTS inc reases at higher medium velocity. The experimental data can be explained by the expansion dynamics of the writing zone. Numerical simulation of the wr iting zone dynamics indicates a time delay in the writing of the hard trans ition compared with the easy one. The dependence of HTS on medium velocity explains the degradation of overwrite at high recording data rates. (C) 199 9 American Institute of Physics. [S0021-8979(99)70808-X].