Eddy-current-free switching of permalloy thin films

Author

Watson, J. Kenneth ; Bourne, Henry C., Jr.

Author_Institution

University of Florida, Gainesville, Fla

Volume

3

Issue

3

fYear

1967

fDate

9/1/1967 12:00:00 AM

Firstpage

301

Lastpage

305

Abstract

Results are presented from an experimental investigation of large-angle flux reversal of magnetic films. The reported measurements were made with an unconventional instrument whose design features are briefly outlined. Switching characteristics for a selected film are shown; coefficients are compared with results of others in region II at 2° transverse bias. The 6 Oe .ns is a magnitude faster than others although the switching field rise time is an order of magnitude slower. On a 2 dimensional field plot, loci which define thresholds of incoherent rotation are found to have two prominent features : a disperse switching astroid for $H_{s}l\\sim H_{k}$ , and an extension described by $H_{s}H_{\\perp }/H_{k} = \\Delta$ for $H_{s} > H_{k}$ . The width of region II, the lower threshold for region II, and the independently-measured dispersion field are all approximately 0.1 Oe for the subject film. Thus $\\Delta \\approx 2H_{k} \\sin \\alpha _{90}$ .

Keywords

Magnetic film switching; Permalloy films; Conductive films; Extraterrestrial measurements; Instruments; Loss measurement; Magnetic films; Particle measurements; Rotation measurement; Switches; Torque measurement; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1967.1066072

Filename

1066072