Physics of Magnetism and Magnetic Materials

Magnetic Materials
 
Author:
K. H. J. Buschow & F. R. de Boer
Release at: 2003
Pages: 191
Edition:
First Edition
File Size: 6 MB
File Type: pdf
Language: English


Content of Physics of Magnetism and Magnetic Materials



Chapter 1. Introduction 1

Chapter 2. The Origin of Atomic Moments 3
2.1. Spin and Orbital States of Electrons 3
2.2. The Vector Model of Atoms 5

Chapter 3. Paramagnetism of Free Ions 11
3.1. The Brillouin Function 11
3.2. The Curie Law 13
References 17

Chapter 4. The Magnetically Ordered State 19
4.1. The Heisenberg Exchange Interaction and the Weiss Field 19
4.2. Ferromagnetism 22
4.3. Antiferromagnetism 26
4.4. Ferrimagnetism 34
References 41

Chapter 5. Crystal Fields 43
5.1. Introduction 43
5.2. Quantum-Mechanical Treatment 44
5.3. Experimental Determination of Crystal-Field Parameters 50
5.4. The Point-Charge Approximation and Its Limitations 52
5.5. Crystal-Field-Induced Anisotropy 54
5.6. A Simplified View of 4f-Electron Anisotropy 56
References 57

Chapter 6. Diamagnetism 59
Reference 61

Chapter 7. Itinerant-Electron Magnetism 63
7.1. Introduction 63
7.2. Susceptibility Enhancement 65
7.3. Strong and Weak Ferromagnetism 66
7.4. Intersublattice Coupling in Alloys of Rare Earths and 3d Metals 70
References 73

Chapter 8. Some Basic Concepts and Units 75
References 83

Chapter 9. Measurement Techniques 85
9.1. The Susceptibility Balance 85
9.2. The Faraday Method 86
9.3. The Vibrating-Sample Magnetometer 87
9.4. The SQUID Magnetometer 89
References 89

Chapter 10. Caloric Effects in Magnetic Materials 91
10.1. The Specific-Heat Anomaly 91
10.2. The Magnetocaloric Effect 93
References 95

Chapter 11. Magnetic Anisotropy 97
References 102

Chapter 12. Permanent Magnets 105
12.1. Introduction 105
12.2. Suitability Criteria 106
12.3. Domains and Domain Walls 109
12.4. Coercivity Mechanisms 112
12.5. Magnetic Anisotropy and Exchange Coupling in Permanent-Magnet Materials Based on Rare-Earth Compounds 115
12.6. Manufacturing Technologies of Rare-Earth-Based Magnets 119
12.7. Hard Ferrites 122
12.8. Alnico Magnets 124
References 128

Chapter 13. High-Density Recording Materials 131
13.1. Introduction 131
13.2. Magneto-Optical Recording Materials 133
13.3. Materials for High-Density Magnetic Recording 139
References 145

Chapter 14. Soft-Magnetic Materials 147
14.1. Introduction 147
14.2. Survey of Materials 148
14.3. The Random-Anisotropy Model 156
14.4. Dependence of Soft-Magnetic Properties on Grain Size 158
14.5. Head Materials and Their Applications 159
14.5.1 High-Density Magnetic-Induction Heads 159
14.5.2 Magnetoresistive Heads 161
References 163

Chapter 15. Invar Alloys 165
References 170

Chapter 16. Magnetostrictive Materials 171
References 175

Author Index 177

Subject Index 179

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