Irreversibility of Magnetization Processes and in Real Ferromagnetic Materials: The Role of Defects

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Front Cover Photo: Courtesy ofPierre Molho, Laboratoire Louis Neel du CNRS, Grenoble, France. A computer hard disk drive, a device combining many state-of-the-art magnetic technologies (courtesy of Seagate Corporation). The unit is set against a magnetic domain pattern in a gamet film, imaged through the mageneto-optical Faraday effect; the domain width is about 7 um (courtesy Pierre Molho, Laboratoire Louis Neel du CNRS, Grenoble, France).

MAGNETISM 1- FUNDAMENTALS

edited by

Etienne w TREMOLET de LACHEISSERIE Damien GIGNOUX Michel SCHLENKER

Distributors for Nortb, Central and Soutb America: Kluwer Academic Publishers 1O1 Philip Drive Assinippi Park Norwell, Massachusetts 02061 USA Telephone (781) 871-6600 Fax (781) 681-9045 E-Mail: [email protected] Distributors for ali otber countries: Kluwer Academic Publishers Group Post Oftice Box 322 3300 AH Dordrecht, THE NETHERLANDS Telephone 31 786 576 000 Fax 31 786 576 254 E-Mail: [email protected] ' ' Electronic Services < http://www.wkap.nl> Library of Congress Cataloging-in-Publication Data Magnetism 1 edited by Etienne du Tremolet de Lacheisserie, Damien Gignoux, Michel Schlenker. p.cm Includes bibliographical references and index. Contents: 1. Fundamentals - II. Materials and applications. ISBN l-40207-222-8 (v. 1) - ISBN l-40207-223-6 (v. 2)- ISBN 1-40207-224-4 (set)

1. Magnetism. 2. Magnetic materials. 1. Du Tremolet de Lacheisserie, Etienne . Il. Gignoux, D. III. Schlenker, M. (Michel), 1940QC753.2.M32 2002 538-dc21 2002029070 Copyright © 2002 by Kluwer Academic Publishers Ali rights reserved. No part ofthis work may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, microfilming, recording, or otherwise, without the written permission from the Publisher, with the exception of any material supplied specifically for the purpose ofbeing entered and executed on a computer system, for exclusive use by the purchaser of the work. Pennission for books published in Europe: [email protected] Pennission for books published in the United States of America: [email protected]

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AUTHORS

Michel CYROT - Professor at the Joseph Fourier University of Grenoble, France Michel ntcoRPS - Senior Researcher, INSERM (French Institute of Health and Medical Research), Bioclinical Magnetic Nuclear Resonance Unit, Grenoble Bernard DIENY - Researcher and group leader at the CEA (French Atomic Energy Center), Grenoble Etienne du TREMOLET de LACHEISSERIE - Senior Researcher, CNRS, Laboratoire Louis Neel, Grenoble Olivier GEOFFROY- Assistant Professor at the Joseph Fourier University of Grenoble Damien GIGNOUX- Professor at the Joseph Fourier University of Grenoble lan HEDLEY - Researcher at the University of Geneva, Switzerland Claudine LACROIX - Senior Researcher, CNRS, Laboratoire Louis Neel, Grenoble Jean LAFOREST - Research Engineer, CNRS, Laboratoire Louis Neel, Grenoble Philippe LETHUILLIER - Engineer at the Joseph Fourier University of Grenoble Pierre MOLHO - Researcher, CN