2002 Volume 26 Issue 4 Pages 325-328
To attain high-density magnetic recording, the parameter a of an isolated transition, which defines the sharpness of the recorded magnetization pattern in the transition region, has to be made small as possible. Here, the values of parameter a are estimated by fitting an arctangent or a hyperbolic tangent function to the recorded magnetization patterns calculated by a finite element R/W simulation solving the Poisson equation for the two-dimensional model of a thin-film head and various media, and compared with those obtained by the analytical formula derived by using the Willams-Comstock and Hokkyou (W-C-H) model. As a result, the calculated recorded magnetization patterns are found to be fitted quite well by a hyperbolic tangent function using the parameter a estimated by using the W-C-H model, and the calculated half-amplitude pulse width PW50’s are found to coincide well with those estimated from an analytical formula obtained by using the reciprocal theorem assuming the Karlqvist head field and an arctangent magnetization pattern.
