Dynamic hysteresis in magnetostrictive amorphous microwires

Author

Sandacci, Sergei I. ; Grigorenko, Alexander N. ; Panina, Larissa V. ; Mapps, Desmond J.

Author_Institution

Dept. of Commun. & Electron. Eng., Univ. of Plymouth, UK

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

2409

Lastpage

2411

Abstract

Dynamic hysteresis in bistable amorphous wires is studied at frequencies up to 200 kHz. As frequency is increased, the magnetization loop exhibits progressive widening, maintaining its bistable property. The switching process is analyzed within the Neel-Brown theory of the magnetization reversal due to activation over an energy barrier. The frequency dependence of the switching field is evaluated by considering a "waiting time" for closure domain wall to escape the pinned state, which gives a very good agreement with the experiment. The time of the magnetization reversal decreases with frequency down to few microseconds at 200 kHz, owing to the switching field increase.

Keywords

Barkhausen effect; amorphous magnetic materials; magnetic domain walls; magnetic hysteresis; magnetic switching; magnetisation reversal; magnetostriction; 200 kHz; Neel-Brown model; activation over energy barrier; bistable amorphous wires; closure domain wall; dynamic hysteresis; frequency dependence; large Barkhausen jumps; magnetization loop; magnetization reversal; magnetostrictive amorphous microwires; pinned state; switching process; waiting time; Amorphous magnetic materials; Amorphous materials; Frequency; Hysteresis; Magnetic analysis; Magnetic properties; Magnetic switching; Magnetization reversal; Magnetostriction; Wires;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.803609

Filename

1042204