PHYSICS OF MAGNETISM AND MAGNETIC MATERIALS

By CHARLES GONZALEZ

CONTENTS CHAPTER 1 INTRODUCTION CHAPTER 2 THE ORIGIN OF ATOMIC MOMENTS 2 1 SPIN AND ORBITAL STATES OF ELECTRONS 2 2 THE VECTOR MODEL OF ATOMS CHAPTER 3 PARAMAGNETISM OF FREE IONS 3 1 THE BRILLOUIN FUNCTION 3 2 THE CURIE LAW REFERENCES CHAPTER 4 THE MAGNETICALLY ORDERED STATE 4 1 THE HEISENBERG EXCHANGE INTERACTION AND THE WEISS FIELD 4 2 FERROMAGNETISM 4 3 ANTIFERROMAGNETISM 4 4 FERRIMAGNETISM CHAPTER 5 CRYSTAL FIELDS 5 1 INTRODUCTION 5 2 QUANTUM-MECHANICAL TREATMENT 5 3 EXPERIMENTAL DETERMINATION OF CRYSTAL-FIELD PARAMETERS 5 4 THE POINT-CHARGE APPROXIMATION AND ITS LIMITATIONS 5 5 CRYSTAL-FIELD-INDUCED ANISOTROPY 5 6 A SIMPLIFIED VIEW OF 4F-ELECTRON ANISOTROPY CHAPTER 6 DIAMAGNETISM REFERENCE CHAPTER 7 ITINERANT-ELECTRON MAGNETISM 7 1 INTRODUCTION 7 2 SUSCEPTIBILITY ENHANCEMENT 7 3 STRONG AND WEAK FERROMAGNETISM 7 4 INTERSUBLATTICE COUPLING IN ALLOYS OF RARE EARTHS AND 3D METALS CHAPTER 8 SOME BASIC CONCEPTS AND UNITS CHAPTER 9 MEASUREMENT TECHNIQUES 9 1 THE SUSCEPTIBILITY BALANCE 9 2 THE FARADAY METHOD 9 3 THE VIBRATING-SAMPLE MAGNETOMETER 9 4 THE SQUID MAGNETOMETER CHAPTER 10 CALORIC EFFECTS IN MAGNETIC MATERIALS 10 1 THE SPECIFIC-HEAT ANOMALY 10 2 THE MAGNETOCALORIC EFFECT CHAPTER 11 MAGNETIC ANISOTROPY CHAPTER 12 PERMANENT MAGNETS 12 1 INTRODUCTION 12 2 SUITABILITY CRITERIA 12 3 DOMAINS AND DOMAIN WALLS 12 4 COERCIVITY MECHANISMS 12 5 MAGNETIC ANISOTROPY AND EXCHANGE COUPLING IN PERMANENT-MAGNET MATERIALS BASED ON RARE-EARTH COMPOUNDS 12 6 MANUFACTURING TECHNOLOGIES OF RARE-EARTH-BASED MAGNETS 12 7 HARD FERRITES 12 8 ALNICO MAGNETS CHAPTER 13 HIGH-DENSITY RECORDING MATERIALS 13 1 INTRODUCTION 13 2 MAGNETO-OPTICAL RECORDING MATERIALS 13 3 MATERIALS FOR HIGH-DENSITY MAGNETIC RECORDING CHAPTER 14 SOFT-MAGNETIC MATERIALS 14 1 INTRODUCTION 14 2 SURVEY OF MATERIALS 14 3 THE RANDOM-ANISOTROPY MODEL 14 4 DEPENDENCE OF SOFT-MAGNETIC PROPERTIES ON GRAIN SIZE 14 5 HEAD MATERIALS AND THEIR APPLICATIONS 14 5 1 HIGH-DENSITY MAGNETIC-INDUCTION HEADS 14 5 2 MAGNETORESISTIVE HEADS CHAPTER 15 INVAR ALLOYS