Dynamic coercivity measurements in thin film recording media using a contact write/read tester

Thermally activated magnetization reversal processes become manifest in the dependence of the remanent coercivity on the time during which a magnetic field is applied opposite to the initial magnetization direction. They have important consequences for the long term stability and short time writeabi lity of future high density recording media. In this paper, we report on a new experiment using a contact write/read tester to study the time dependen ce of the remanent coercivity over more than 10 orders of magnitude (from 6 ns to >60 s). Remanence coercivity and signal decay measurements of a CoPt Cr recording medium with 5.5 nm thickness are presented. (C) 1999 American Institute of Physics. [S0021-8979(99)62908-5].