Temperature induced shift of the demagnetization curve of anisotropic ferrite magnets

Issue		Eur. Phys. J. Appl. Phys. Volume 4, Number 3, December 1998


Page(s)		251 - 255
DOI		10.1051/epjap:1998268

DOI: 10.1051/epjap:1998268

Eur. Phys. J. AP 4, 251-255

Temperature induced shift of the demagnetization curve
of anisotropic ferrite magnets

F. Kools¹ and E. Brando²

¹ Philips Components, BU Magnetic Products, BE 2, P.O. Box 218, 5600 MD Eindhoven, The Netherlands
² Philips Composants Évreux, 41 rue Pierre Brossolette, BP 1642, 27016 Évreux, France

Received: 14 April 1998 / Revised: 7 August 1998 / Accepted: 28 August 1998

Abstract
Higher specifications and more narrow tolerances for electrical motor appliances give sense to a renewed interest in the temperature dependence of the demagnetization curve of anisotropic ferrite magnets. Based on physical backgrounds, a first approximation modelling is given for the temperature dependence of a working point, using the room temperature curve and some material and system characteristics. A procedure is derived to give the induced shift of the whole curve at any temperature (-100 to $300~^\circ$ C). An important characteristic for the application is the field Hki, where irreversible flux losses start. Hence, the critical temperature decrease, at which Hki is reached in the system, is derived.

PACS
75.50.-y Studies of specific magnetic materials - 75.50.Gg Ferrimagnetics - 75.50.Vv High
coercivity materials

Author for correspondance: eric.brando@eur.comp.philips.com

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