Dual coercive force hysteresis in MnAlGe films

Author

Eschenfelder, A.H. ; Onton, A. ; Lorenz, M.

Author_Institution

IBM Research Laboratory, San Jose, California

Volume

10

Issue

3

fYear

1974

fDate

9/1/1974 12:00:00 AM

Firstpage

935

Lastpage

938

Abstract

The room temperature coercive force of some MnAlGe films can be substantially altered in a reversible way. The coercive force is reduced by heating to $\\sim120\\deg$ C and then recooling to room temperature. The low coercive force hysteresis loop can be indefinitely cycled as long as the applied field does not exceed a threshold, Hx. The large coercive force can be restored by applying a field greater than Hx. This paper contains the results of experimental observations and calculations of this phenomenon. The experimental observations include magnetic hysteresis measurements and visual observation of the details of the magnetic domain reversal process, using the Faraday effect. A model is proposed to explain this phenomenon. Both the calculations and the experimental observations support the proposed explanation.

Keywords

Coercive forces; Magnetic thermal effects; Manganese aluminum germanium films; Anisotropic magnetoresistance; Coercive force; Faraday effect; Magnetic domains; Magnetic films; Magnetic hysteresis; Magnetic materials; Saturation magnetization; Temperature dependence; Temperature distribution;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1974.1058418

Filename

1058418