Nonlinear Transition Shift in the Combination of Single-layered Perpendicular Recording Medium and Ring Head

Abstract

Nonlinear transition shifts (NLTS) in the combination of single-layered perpendicular recording media and ring head writing are investigated by read/write experiments employing the fifth harmonic elimination method. The NLTS of single-layered perpendicular recording medium can be kept at the low level at high linear recording density. The NLTS smaller than 10 % is observed at 300 kFCI for a 25 nm thick CoCrPt perpendicular recording medium. Decreasing the medium thickness improves the NLTS.