D. Wachenschwanz et M. Alex, The effect of the switching rate dependence of coercivity on recording performance, J APPL PHYS, 85(8), 1999, pp. 5312-5314
A technique was developed to determine the dynamic remanent coercivity, H-c
,H-r, of the writing process using a spin stand to measure the fundamental
signal harmonic as a function of write current. The technique also provides
a measurement of the remanent-moment-thickness product, M(r)t, as well as
coercive squareness, S*. These measurements were compared with measurements
done with a Kerr-effect magnetometer for various media having different al
loy compositions and/or processing conditions. It was found that recording
parametrics such as PW50 and media jitter correlated well with the dynamic
coercivity at actual recording field switching rates. Measurements of adjac
ent track interference or "squeeze" were also found to have excellent corre
lation with the dynamic media coercivity. (C) 1999 American Institute of Ph
ysics. [S0021-8979(99)31008-2].