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For further volumes: http://www.springer.com/series/8884

Dan Wei

Micromagnetics and Recording Materials

123

Dan Wei Department of Materials Science and Engineering Tsinghua University Beijing Shuangqing 100084 Beijing China

ISSN 2191-530X ISBN 978-3-642-28576-9 DOI 10.1007/978-3-642-28577-6

ISSN 2191-5318 (electronic) ISBN 978-3-642-28577-6 (eBook)

Springer Heidelberg New York Dordrecht London Library of Congress Control Number: 2012938234 Ó The Author(s) 2012 This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. Exempted from this legal reservation are brief excerpts in connection with reviews or scholarly analysis or material supplied specifically for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Duplication of this publication or parts thereof is permitted only under the provisions of the Copyright Law of the Publisher’s location, in its current version, and permission for use must always be obtained from Springer. Permissions for use may be obtained through RightsLink at the Copyright Clearance Center. Violations are liable to prosecution under the respective Copyright Law. The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. The publisher makes no warranty, express or implied, with respect to the material contained herein. Printed on acid-free paper Springer is part of Springer Science+Business Media (www.springer.com)

Preface

The phrase ‘‘micromagnetics’’ was brought up by William Fuller Brown Jr. in 1958, now it has become mainstream theory for computational applied magnetism. Brown wrote the first book named as Micromagnetics in 1963, he summarized the ‘‘magnetization curve theory’’ and ‘‘domain theory’’ before the 1960s, which are still the main parts of today’s micromagnetics. In micromagnetics, the magnetic materials are discretized into micromagnetic cells, the equation of motion for magnetic moments in cells is the Landau-Lifshitz equation, and the magnetostatic interactions among all cells are calculated following the spirit of Maxwell’s equations. In the 1980s, two main computational micromagnetic methods were developed: finite difference method (FDM) and