Disk drive using the thermal signal from an MR-head as a radial position sensor

Author

Smith, Gordon J. ; Ottesen, Hal H.

Author_Institution

IBM Corp., Rochester, MN, USA

Volume

36

Issue

5

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

2232

Lastpage

2234

Abstract

The thermal response of a magnetoresistive (MR) head can be used to detect disk defects in a disk drive. An extension of this result is to use the thermal response for the detection of topographical track boundaries for the purpose of track following and seeking during magnetic recording in a disk drive. A special disk, called a Pre-Embossed Rigid Thermal (PERT) disk uses embossed patterns in the grooves between mesa-like tracks. The groove-embossed patterns produce modulation in the MR element-to-disk spacing and therefore a detectable modulation in the thermal response from an MR head

Keywords

disc drives; hard discs; magnetic heads; magnetoresistive devices; modulation; position control; servomechanisms; MR-head; detectable modulation; disk defects; disk drive; magnetic recording; mesa-like tracks; pre-embossed rigid thermal disk; radial position sensor; thermal signal; topographical track boundaries; track seeking; track-following; Disk drives; Electric resistance; Frequency; Magnetic heads; Magnetic recording; Magnetic sensors; Servomechanisms; Signal processing; Thermal sensors; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.908372

Filename

908372