Title :
Shield-related side reading in MR heads
Author :
Shi, Xizeng ; Ju, Kochan
Author_Institution :
Headway Technologies, Milpitas, CA, USA
fDate :
9/1/1997 12:00:00 AM
Abstract :
Shield-related side reading of recorded data tracks by shielded MR heads is investigated. This phenomenon is caused by the magnetic coupling between the shields and MR elements. Changes in the magnetic states in the shields can either make the side reading appear or disappear. The linear density of the recorded pattern has a strong effect on the degree of the phenomenon. In reading the synchronization patterns in the servo field of a hard disk drive, this kind of MR head can produce a read-back signal with severe distortion, causing the drive to malfunction. Improved shield structure can significantly reduce this side reading
Keywords :
hard discs; magnetic heads; magnetic shielding; magnetoresistive devices; synchronisation; distortion; hard disk drive; linear density; magnetic coupling; magnetic states; read-back signal; recorded data tracks; servo field; shield-related side reading; shielded MR heads; synchronization patterns; Couplings; Disk drives; Distortion; Drives; Hard disks; Magnetic heads; Magnetic shielding; Servomechanisms; Testing; Transducers; Writing;
Journal_Title :
Magnetics, IEEE Transactions on
