DocumentCode :
996086
Title :
Magnetic flux propagation in 3%Si-Fe single crystals
Author :
Bertotti, G. ; Fiorillo, F.
Author_Institution :
Galileo Ferraris Nat. Electrotech. Inst., Turin, Italy
Volume :
25
Issue :
5
fYear :
1989
fDate :
9/1/1989 12:00:00 AM
Firstpage :
3970
Lastpage :
3972
Abstract :
The magnetization process has been investigated by means of a space-time analysis of the Barkhausen signal associated with domain-wall motion. The microscopic phenomenology of flux propagation has been elucidated from local measurements and suitable time averaging, performed as a function of actual permeability μ of the sample. Magnetization reversals, whose nucleation corresponds to a given cross-section, are propagated along the sample in a diffusive fashion, and their final size appears to be controlled essentially by the demagnetizing field. In particular, the average reversal amplitude is found to decay with distance from the nucleation site, according to a μ1/2 law. A general stochastic equation for the Barkhausen effect, describing the behavior in space and time of the magnetic flux derivative associated with domain-wall motion, is presented. An analytical expression for the average Barkhausen avalanche is derived from which the dependence on time, distance from nucleation cross-section, and permeability can be predicted accurately
Keywords :
Barkhausen effect; ferromagnetic properties of substances; iron alloys; magnetic domain walls; magnetic flux; magnetic permeability; magnetisation reversal; silicon alloys; stochastic processes; Barkhausen signal; Fe-Si single crystals; avalanche; domain-wall motion; general stochastic equation; magnetic flux propagation; magnetisation reversals; nucleation; permeability; time averaging; Crystals; Magnetic analysis; Magnetic field measurement; Magnetic flux; Magnetization processes; Microscopy; Motion analysis; Permeability; Signal analysis; Signal processing;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/20.42492
Filename :
42492
Link To Document :
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