Title :
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
fDate :
9/1/1997 12:00:00 AM
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/τv ~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;
Journal_Title :
Magnetics, IEEE Transactions on
