Experimental and theoretical studies of nonlinear transition shift in metal evaporated tape

The results of experimental and theoretical studies of nonlinear transition shift (NLTS) in advanced metal evaporated (ME) tape are noted. Using the harmonic elimination technique the NLTS as a function of linear recording density was measured. Using a calibrated self-consistent recording model the patterns corresponding to the harmonic elimination technique were simulated allowing NLTS to be calculated. Dipulses were also calculated, and carefully fitted, allowing Partial Erasure (PE) to be determined. The variation in NLTS as a function of easy-axis angle in ME tape was also simulated. In agreement with a previous conjecture by J. Mallinson [1989], the NLTS is found to go through zero, For the head and medium considered, the zero occurs at an easy-axis angle of slightly greater than 35 degrees from the longitudinal direction.