Title :
Overwrite in thin film disk recording systems
Author :
Lin, Gang Herbert ; Zhao, Yang ; Bertram, H. Neal
Author_Institution :
Center for Magnetic Recording Res., California Univ., San Diego, La Jolla, CA, USA
fDate :
11/1/1993 12:00:00 AM
Abstract :
Overwrite in thin film rigid disk recording is studied experimentally using disks with a wide range of magnetic moment and coercivity. Standard f2/f1 overwrite is investigated in detail at various recording currents and different flying heights. A theoretical model is developed using simple analytical approximations that relate demagnetization-field-induced position shift (hard transition shift) to the measured overwrite. The demagnetization fields due to the leading edge transitions are calculated analytically including a good approximation to the gapped head image. The results compare well with experimental measurements. A new overwrite measurement technique using the second harmonic component of a 0.5f1, signal is also described
Keywords :
demagnetisation; hard discs; magnetic fields; magnetic film stores; magnetic recording; magnetostatics; modelling; modulation; demagnetization fields; demagnetization-field-induced position shift; digital magnetic recording; flying heights; gapped head image; hard transition shift; leading edge transitions; magnetostatic field; modulation shift; overwrite measurement technique; rigid disk; second harmonic component; theoretical model; thin film disk recording systems; Coercive force; Demagnetization; Disk recording; Magnetic analysis; Magnetic field measurement; Magnetic films; Magnetic moments; Magnetic recording; Position measurement; Transistors;
Journal_Title :
Magnetics, IEEE Transactions on