Ultrafast laser diagnostics and modeling for high-speed recording heads

Author

Shi, Zhu-Pei ; Hiebert, Wayne K. ; Freeman, Mark R.

Author_Institution

Div. of Res. & Dev., Read-Rite Corp., Fremont, CA, USA

Volume

35

Issue

2

fYear

1999

fDate

3/1/1999 12:00:00 AM

Firstpage

632

Lastpage

636

Abstract

A comparison of experiment and modeling in high-speed recording heads is given from study of the dependence of flux rise times on yoke lengths. A brief overview is given of optical methods for characterizing the response of devices and materials for high data rate recording. Several abilities of the technique and, in particular, measurements of current and flux rise times on high-speed writers are presented. A micromagnetic model that takes into account gyromagnetic effects and eddy currents gives calculations that agree well with experimental data. Flux rise times are found to decrease with shorter yoke lengths for both unlaminated and laminated heads for a current rise time of 0.8 ns

Keywords

eddy currents; gyromagnetic effect; high-speed optical techniques; magnetic heads; measurement by laser beam; current rise time; data recording; eddy current; flux rise time; gyromagnetic effect; high-speed recording head; lamination; micromagnetic model; optical measurement; ultrafast laser diagnostics; yoke length; Current measurement; High speed optical techniques; Laser modes; Magnetic heads; Micromagnetics; Optical devices; Optical materials; Optical recording; Particle measurements; Ultrafast optics;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.750619

Filename

750619