目录

Foreword

Preface

List of Contributors

1 Recent Developments in High-Temperature Permanent Magnet Materials

1.1 Introduction1

1.1.1 Requirement for High|Temperature Permanent Magnet Materials1

1.1.2 Review of Conventional Permanent Magnet Materials1

1.2 Candidate Alloy System for High|Temperature Permanent Magnet Materials4

1.3 New Sm2Co17|Based High|Temperature Permanent Magnet Materials7

1.3.1 Effects of Compositions on High|Temperature Intrinsic Coercivity of Sm2

|TM17 Permanent Magnets7

1.3.2 Magnetic Properties of New Sm2Co17|Based High|Temperature Permanent

Magnet Materials13

1.3.3 Dynamic Characterizations of New High|Temperature Permanent Magnets16

1.3.4 Long|Term Thermal Stability of New High|Temperature Permanent Magnets19

1.3.5 Microstructure and Crystal Structure21

1.3.6 Coercivity in Sm2|TM17|Type Permanent Magnets23

1.4 New Approach to Calculate Temperature Coefficients of Magnetic Properties35

1.5 SmCo7|Type Permanent Magnets38

1.6 Temperature Compensated Rare Earth Permanent Magnets and Modeling of

Temperature Coefficient of Magnetization39

1.7 Other High|Temperature Permanent Magnet Materials and Furture Perspective46

References47

2 New Rare|Earth Transition|Metal Intermetallic Compounds and Metastable Phases

for Permanent Magnetic Materials50

2.1 Introduction50

2.1.1 Overview of Structures 51

2.2 Experimental Processing54

2.2.1 Melting 54

2.2.2 Mechanical Alloying/Milling55

2.2.3 Rapid Quenching 55

2.2.4 HDDR55

2.2.5 Solid|State Reaction56

2.2.6 Solid|Gas Reaction56

2.2.7 Sputtering56

2.3 New Intermetallic Compounds57

2.3.1 R(Fe,T,X)12(X=B,C)57

2.3.2 R2Fe14BNδ59

2.3.3 R6Fe13-xM1+x61

2.3.4 R3T29Si4B1061

2.4 Metastable Phases64

2.4.1 RFe564

2.4.2 RT7 (T=Fe,Co,Ti,etc.)65

2.4.3 RT7Nδ68

2.4.4 R|Fe|C72

2.4.5 Nd2Fe14BNδ74

2.4.6 RFe1275

2.5 Discussion 76

2.6 Conclusions 79

References 803 Magnetic Properties and Interstitial Atom Effects in the R(Fe,M)12

4 Nanocrystalline Soft Magnetic Materials and Their Applications124

5 Spin|Density Waves and Charge|Density Waves in Cr Alloys159

6 New Magnetic Recording Media211

7 Magneto|Optical Properties of Nanostructured Media241

8 Magnetoresistive Recording Heads271

9 Magnetic Random Access Memories for Computer Data Storage292

10 Magnetoresistive Thin Film Materials and Their Device Applications307

11 Nano|Structural Magnetoelastic Materials for Sensor Applications339

12 Soft Magnetic Films and Wires for Magnetic Field Sensors380

13 Microwave Permeability of Magnetic Films414