Magnetic aftereffect in spring magnets and the Preisach model of hysteresis

Author

LoBue, M. ; Basso, V. ; Bertotti, G. ; Müller, K.H.

Author_Institution

Ist. Elettrotecnico Nazionale Galileo Ferraris, Torino, Italy

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

3862

Lastpage

3864

Abstract

Magnetic viscosity measurements on NdFeB spring-magnets are interpreted by means of a thermodynamic generalization of the Preisach hysteresis model. The model correctly predicts the observed decay of magnetization and clarifies the connection between anomalous, non-monotone after-effect and applied field history. Comparison between theory and experiments permits one to estimate the after-effect activation volume, d³≈(12 nm)³, and the attempt frequency 1/τ_v ~10¹⁰ s^-1

Keywords

boron alloys; ferromagnetic materials; iron alloys; magnetic aftereffect; magnetic hysteresis; neodymium alloys; permanent magnets; thermodynamics; NdFeB; NdFeB spring-magnets; Preisach hysteresis model; after-effect activation volume; anomalous nonmonotonous after-effect; applied field history; attempt frequency; magnetic aftereffect; magnetic viscosity measurements; magnetization decay; thermal relaxation; thermodynamic generalization; Frequency estimation; History; Magnetic field measurement; Magnetic hysteresis; Magnetization; Magnets; Predictive models; Springs; Thermodynamics; Viscosity;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.619596

Filename

619596