Measurement of the switching speed limit in high coercivity magnetic media

Author

Doyle, W.D. ; He, L. ; Flanders, P.J.

Author_Institution

Dept. of Phys., Alabama Univ., Tuscaloosa, AL, USA

Volume

29

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

3634

Lastpage

3636

Abstract

A microstripline pulse field system that allows the switching speed of high coercivity magnetic media to be measured with pulse widths t⩾0.64 ns is discussed. The results for γFe₂O₃ are in good agreement with the previous work of Thornley and Williams (1974). A DC bias field H_B was added to the pulse field to allow the high coercivity samples to be switched from saturation to zero remanence and the results analyzed in terms of the switching constant S_w. At H_B=400 Oe, S_w(Co-γFe₂O₃)=158 ns-Oe; at H_B=700 Oe, S_W (barium ferrite)=135 ns-Oe; at H_B=720 Oe, S_W (metal particle)=84 ns-Oe. The value of S_W increased with decreasing bias field, particularly for barium ferrite, indicating that in zero bias barium ferrite tapes it would be a factor of three slower than metal particle tapes

Keywords

barium compounds; cobalt; coercive force; ferrites; iron; magnetic properties of fine particles; magnetic recording; magnetic switching; magnetic tapes; remanence; BaFe₁₂O₁₉; Co-Fe₂O₃; DC bias field; Fe particles; high coercivity magnetic media; magnetic recording; metal particle tapes; microstripline pulse field system; remanence; switching constant; switching speed limit; Barium; Coercive force; Ferrites; Magnetic field measurement; Magnetic switching; Microstrip; Pulse measurements; Saturation magnetization; Space vector pulse width modulation; Velocity measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.281253

Filename

281253