Demagnetization due to inverse magnetostriction effects in longitudinal thin film media

Author

Tae Gun Jeong ; Bogy, D.B.

Author_Institution

Dept. of Mech. Eng., Konkuk Univ., Seoul, South Korea

Volume

31

Issue

2

fYear

1995

fDate

3/1/1995 12:00:00 AM

Firstpage

1007

Lastpage

1012

Abstract

Unpredictable mechanical stresses that occur during the operation of hard disk drives can degrade the recorded signal. On the basis of a micromagnetic analysis and the calculated stress field during head-disk impact, inverse magnetostriction effects in longitudinal recording thin film media are considered and demagnetization due to head-disk impact is simulated numerically. Thin film media are modeled as planar hexagonal arrays of hexagonally shaped grains. The computation uses the conjugate gradient algorithm to minimize the variation of the total energy. In particular, the effect of the stress on the relaxation process is investigated. Also the change in the remanent magnetization due to repetitive head-disk impacts is calculated. We obtained results indicating that the effect of the impact stress during dynamic loading is not so significant as to cause data loss during operation for the longitudinal thin film media.<>

Keywords

conjugate gradient methods; demagnetisation; hard discs; magnetic thin film devices; magnetostriction; remanence; conjugate gradient algorithm; demagnetization; dynamic loading; hard disk drives; head-disk impact; hexagonally shaped grains; inverse magnetostriction effects; longitudinal thin film media; mechanical stresses; micromagnetic analysis; planar hexagonal arrays; recorded signal degradation; relaxation process; remanent magnetization; Computational modeling; Degradation; Demagnetization; Disk recording; Hard disks; Magnetic analysis; Magnetostriction; Micromagnetics; Stress; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.364776

Filename

364776