[Back]

V. Basso, G. Bertotti, J.C. Tellez Blanco, R. Grössinger, D. Eckert, K.-H. Müller:
"Temperature dependence of hysteresis and relaxation effects in hard magnetic materials";
Journal of Magnetism and Magnetic Materials, 242 - 245 (2002), 1317 - 1320.

Temperature dependence of hysteresis and relaxation effects in hard magnetic materials

V. Basso [Corresponding Author Contact Information] , [E-mail The Corresponding Author] , a, G. Bertottia, J. C. Téllez Blancob, R. Grössingerb, D. Eckertc and K. -H. Müllerc

a IEN Galileo Ferraris, Strada delle Cacce 91, Torino, Italy
b TU Wien, Wiedner Hauptstrasse 8-10, Vienna, Austria
c IFW Dresden, Helmholtzstrasse 20, Dresden, Germany

Available online 11 December 2001.

Abstract

Hysteresis properties and viscosity effects have been studied at several temperatures (in the range from 140 to 500 K) on hard Sm(Co,Cu)5 alloys. The application of a recently proposed theoretical approach permits one to identify the fluctuation field Hf , connected to a typical activation volume, and the Preisach distribution, connected to microstructure. We found that: (i) at a single temperature, the model is able to reproduce the complex magnetization dynamics measured under pulsed field history excitation in a detailed fashion; (ii) the Preisach distribution for different temperatures can be rescaled onto a temperature-independent single curve through a temperature-dependent scale factor HA(T) equivalent to the anisotropy field.

Author Keywords: Hysteresis; Magnetic viscosity

http://www.elsevier.com/locate/jmmm