Title :
An optical method to study the domain wall dynamic instability in amorphous ribbons
Author :
Beatrice, C. ; Mazzetti, P. ; Vinai, F.
Author_Institution :
Istituto Elettrotecnico Nazionale Galileo Ferraris, Torino, Italy
fDate :
9/1/1990 12:00:00 AM
Abstract :
An original method for the determination of the surface energy γ0 of a Bloch wall in a ferromagnetic specimen characterized by an antiparallel domain structure is described. It is based on the fact that, when the wall is oscillating with an increasing amplitude under the action of an external field, a critical amplitude is reached above which the wall becomes unstable and wall multiplication takes place. For a given frequency, the critical amplitude depends on the value of γ0. The mathematical procedure for determining the relation between the critical oscillation amplitude and γ0 is described and tested on a set of experimental results obtained on a specimen of Metglas 2605 SC. The wall oscillation amplitude is measured by means of an optical setup
Keywords :
ferromagnetic properties of substances; magnetic domain walls; magnetic properties of amorphous substances; Bloch wall; Metglas 2605 SC; amorphous ribbons; antiparallel domain structure; critical oscillation amplitude; domain wall dynamic instability; ferromagnetic; optical method; surface energy; wall multiplication; Amorphous magnetic materials; Amorphous materials; Demagnetization; Displacement measurement; Frequency; Magnetic domain walls; Magnetic field measurement; Optical surface waves; Permeability measurement; Velocity measurement;
Journal_Title :
Magnetics, IEEE Transactions on
