J. Phys. IV France
Volume 08, Numéro PR2, June 1998
Soft Magnetic Materials 13
Page(s) Pr2-413 - Pr2-416
Soft Magnetic Materials 13

J. Phys. IV France 08 (1998) Pr2-413-Pr2-416

DOI: 10.1051/jp4:1998296

Influence of the molding pressure on the magnetic properties of soft ferrite composite materials

A. Chevalier1, F. Le Floc'h2, A.M. Konn Martin1 and M. Le Floc'h1

1  LEST, UMR 6616 du CNRS, 6 avenue Le Gorgeu, BP. 809, 29285 Brest cedex, France
2  UMR 652, Chimie-Électrochimie Moléculaire-Chimie Analytique, 6 avenue Le Gorgeu, BP. 809, 29285 Brest cedex, France

Experimental studies on the complex susceptibility of soft magnetic composite materials (Ni and Ni-Zn spinels and YIG) in their region of spin resonance (SR) show that the SR frequency is a decreasing function of the magnetic concentration (demagnetising effects) which however tends to the natural spin resonance (NSR) frequency of the bulk material much before the unit concentration is reached. We take benefit of this remarkable property to show how powders could advantageously replace sintered materials to measure with no ambiguity the NSR frequencies. Since composite materials are achieved by molding processes under pressures, particular care of the technological stresses has been taken.

© EDP Sciences 1998