Switching field time dependence of thin film media

Author

Mallary, Michael L. ; Torabi, Adam F. ; Beauregard, Roger

Author_Institution

Quantum Corp. Technol. & Eng., Shrewsbury, MA, USA

Volume

36

Issue

5

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

2477

Lastpage

2479

Abstract

The dependence of remanent coercivity of thin film media on pulse duration has been measured for time intervals from 1.4 ns to 270 hr. The apparatus combines the field from a microconductor with that of a DC magnet to switch the media. The data from 53 μs to 270 hr fits well to Sharrock´s Law with an exponent of 0.716. The data for times less than 8 ns indicate weak gyro-magnetic enhancement of the switching field. Micromagnetic simulation shows that this can be explained by either magnetostatic or exchange coupling between the grains

Keywords

coercive force; exchange interactions (electron); hard discs; magnetic thin film devices; remanence; 1.4 ns to 270 hr; DC magnet; Sharrock´s Law; exchange coupling; gyro-magnetic enhancement; hard disk drives; high coercivity media; magnetostatic coupling; microconductor; micromagnetic simulation; pulse duration; remanent coercivity; switching field; switching field time dependence; thin film media; Coercive force; Couplings; Magnetic field measurement; Magnetic switching; Magnetostatics; Micromagnetics; Pulse measurements; Switches; Time measurement; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.908479

Filename

908479