High Performance Soft Magnetic Materials (eBook)

Preface 6
Contents 8
Contributors 10
Chapter 1: Amorphous and Nanocrystalline Glass-Coated Wires: Optimization of Soft Magnetic Properties 13
1.1 Introduction 13
1.2 Engineering of Magnetic Properties and GMI Effect of Amorphous Microwires 16
1.2.1 Domain Wall Dynamics Is Affected by the Internal Stresses 27
1.3 Effect of Partial Crystallization and Nanocrystallization on Magnetic Properties and GMI 32
1.4 Conclusions 39
Referencess 41
Chapter 2: Tailoring of Soft Magnetic Properties and High Frequency Giant Magnetoimpedance in Amorphous Ribbons 44
2.1 Introduction 44
2.2 Giant Magnetoimpedance Effect 45
2.3 Amorphous Ribbons Production 47
2.3.1 Melt Spinning 47
2.3.2 Structural Characterization 48
2.4 Experimental Techniques 49
2.4.1 Magnetic Characterization: Hysteresis Loops and Magnetostriction 49
2.4.2 Measurement of GMI Effect 50
2.4.3 Thermal Treatments: Stress Annealing and Current Annealing 51
2.5 Results and Discussion 52
2.5.1 Induced Anisotropy Influence on GMI Components in Stress-Annealed Co-Based Amorphous Ribbons 52
2.5.2 Influence of Current Annealing on GMI Effect in Co-Rich Amorphous Ribbons 57
2.6 Conclusions 60
References 61
Chapter 3: Melt Extracted Microwires 64
3.1 Introduction to Melt Extraction Technique 64
3.2 Casting Method: Production and Processing 65
3.2.1 Process Parameter and Optimization 66
3.2.2 Puddle Deformation Behavior 71
3.2.3 Wires Formation Mechanism 73
3.3 Mechanical Properties 75
3.3.1 Tensile Property and Fracture Reliability 75
3.3.2 Strain Rate Dependence 77
3.3.3 Cold-Drawn Property 82
3.4 Magnetic Behavior 86
3.4.1 Giant Magnetoimpedance 86
3.4.2 Magnetocaloric Property 92
3.5 Conclusions 96
References 97
Chapter 4: Giant Magneto-Impedance Effect in Amorphous Ferromagnetic Microwire with a Weak Helical Anisotropy 101
4.1 Introduction 101
4.2 The Nature of the Magnetic Anisotropy in Amorphous Ferromagnetic Microwires 102
4.2.1 The Density of the Magneto-Elastic Energy 102
4.2.2 The Estimation of Residual Quenching Stress 103
4.3 Stationary Magnetization Distribution in Co-rich Microwire and Its Evolution in the External Magnetic Field 106
4.3.1 Amorphous Wire with a Circular Type of Magnetic Anisotropy 106
4.3.2 Amorphous Wire with a Weak Helical Anisotropy. Effect of Magnetic Field of DC Current 107
4.4 Giant Magneto-Impedance in Amorphous Co-rich Microwire 111
4.4.1 Amorphous Wire with a Circular Type of Magnetic Anisotropy 111
4.4.2 Amorphous Wire with a Weak Helical Anisotropy 111
4.5 Optimization of the GMI Characteristics of Co-rich Amorphous Microwire 114
4.5.1 The Main Parameters that Determine the Slope of the Off-Diagonal GMI Component as a Function of Applied Magnetic Field 114
4.5.2 The Role of Structural Defects and Bamboo Domain Walls 115
4.6 Conclusion 117
References 117
Chapter 5: Tunable Magnetic Anisotropy and Magnetization Reversal in Microwires 120
5.1 Introduction 120
5.2 Experimental Details 121
5.3 Mechanical Torsion Stress Effect 125
5.4 Temperature Effect 129
5.5 High-Frequency Electric Current Effect 133
5.6 Conclusion 136
References 137
Chapter 6: Tunable Electric Polarization of Magnetic Microwires for Sensing Applications 139
6.1 Introduction 139
6.2 Electrical Dipole Moment of a Magnetic Wire 141
6.2.1 Antenna Approximation and Impedance Boundary Conditions 142
6.2.2 Current Distribution in a Magnetic Wire (Antenna Equation with Impedance Boundary Condition) 143
6.2.3 Tunable Polarizability of a Magnetic Wire 147
6.3 Wireless Sensor Based on Tunable Wire Polarizability 150
6.4 Tunable from Composites with Cut-Magnetic Wires 152
6.5 Conclusion 156
References 156
Chapter 7: Soft Ferromagnetic Microwires with Excellent Inductive Heating Properties for Clinical Hyperthermia Applications 159
7.1 Introduction 159
7.1.1 Overview 159
7.1.2 Magnetic Hyperthermia 160
7.1.3 Soft Ferromagnetic Glass-Coated Microwires 161
7.2 Experimental 163
7.2.1 Fabrication and Characterization 163
7.2.2 Magnetic Hyperthermia 165
7.3 Results and Discussion 167
7.3.1 Structural Analysis 167
7.3.2 Surface Morphology 168
7.3.3 Magnetic Properties 168
7.3.4 Inductive Heating Properties 169
7.4 Concluding Remarks and Future Scope 172
References 174
Chapter 8: Magnetically Bistable Microwires: Properties and Applications for Magnetic Field, Temperature, and Stress Sensing 176
8.1 Introduction 176
8.2 Theoretical Background of the Switching Field 178
8.2.1 Switching Field of Closure Domain Wall 178
8.2.2 Experimental Method 180
8.2.3 Contributions to the Switching Mechanism 181
8.3 Magnetic Field Sensing Applications 186
8.4 Temperature Dependence of the Switching Field for Industrial Applications 189
8.4.1 Effect of Compositions on Temperature Dependence of the Switching Field 189
8.4.2 Amorphous and Nanocrystalline FeNiMoB Microwires 190
8.4.3 Amorphous and Nanocrystalline FeCoMoB Microwires 192
8.4.4 Amorphous and Nanocrystalline FeSiBNb Microwires 195
8.4.5 Amorphous FeSiBCr Microwires 196
8.4.6 Amorphous FeSiBP Microwires 197
8.4.7 Amorphous FeNiCrB Microwires 198
8.4.8 Amorphous and Nanocrystalline FeMoBCu Microwires 202
8.5 Temperature Dependence of the Switching Field for Biomedical Application 203
8.5.1 Amorphous FeWB Microwires 204
8.5.2 Amorphous and Nanocrystalline FeMoBCu Microwires with High Content of Molybdenum 206
8.5.3 Applications 207
8.6 Stress Dependence of the Switching Field 207
8.6.1 Theory 207
8.6.2 Applications 210
8.7 Conclusions 212
References 213
Index 220