Table of contents for Modern ferrite technology / Alex Goldman.


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Chapter 1: Basics of Magnetism-Source of Magnetic Effect.............................. 1
Introduction....................................................................................................... 1
Magnetic Fields................................................................................................. 1
The Concept of Magnetic Poles ....................................................................                        2
Electromagnetism..............................................................................................                           5
Atomic Magnetism        ............................................................................................            5
Paramagnetism and   Diamagnetism             ..................................................        .............       9
Ferromagnestism              ............................................................................................... 10
Antiferromagnetism                 .......................................................        ............................... 11
Ferrimagnetism             ...............................................................................................             13
Paramagnetism above the Curie Point............................................                      ............. 14
Summary...............................................................................................................                 14
Chapter 2: The Magnestization in Domains and Bulk Materials .....................17
Introduction.....................................................................................................                      17
The Nature of Domains..........................................................................                         ......... 17
Proof of the Existence of Domains..............................................................                                  ..    21
The Dynamic Behavior of Domains...................................................................                                   . 23
Bulk Material Magnetization         .................................................     ....................... 24
MKSA Units ................................................................................................... 28
Hysteresis Loops.................................................................................................                      28
Permeability .................................................................................................... 30
Magnetocrystalline Anisotropy Constants ................................................                     .. 31
Magnetostriction          ............................................................................................. 32
Important Properties for Hard Magnetic Materials ........................................... 33
Summary ..........................................................................................................                     34
Chapter 3: AC Properties of Ferrites............................                                  ....................................35
Introduction.....................................................................................................                      35
AC Hysteresis Loops.......................................................                     ..............................      35
Eddy Current Losses .......................................................................................                       35
Permeability ........................................................................................................ 38
Disaccomamodation ...............................................................................                       .......... 42
Core Loss ........................................................................................................ 43
Microwave Properties ........................................................                   ........................... 44
Microwave Precessional Modes .................................................................           ...     47
Logic and Switching Properties of Ferrites ...................................................                    .... 48
Properties of Recording Media ...................................          ................................ 49
Summary .............................................................................................................. 49
Chapter 4: Crystal Structure of Ferrites ......................................................           ......       51
Introduction.....................................................................................................               51
Classes of Crystal Structures in Ferrites.......................................................... 51
Hexagonal Ferrites .......................................................................................... 63
Magnetic Rare Earth Garnets .................................................       ....................... 65
Chapter 5: Chemical Aspects of Ferrites ............................................................                            71
Intrinsic and Extrinsic Properties of Ferrites..................................................                     ... 71
Magnetic Properties Under Consideration                            ................................................          .. 71
Mixed   Ferrites for Property Optimization........................................................             . 72
Temperature Dependence of Initial Permeability.............................................. 89
Time Dependence-Initial Permeability (Disaccomodation)............................ 92
Chemistry Dependence-Low Field Losses (Loss Factor) ...........................                 .... 93
Chemistry  Considerations for Hard                 Ferrites...................................................... 104
Saturation Induction-Microwave Ferrites and Garnets ................................... 104
Ferrites for Memory and    Recording Applications............................................... 106
Chapter 6: Microstructural Aspects of Ferrites...............................                                    ..........  ..... 111
Introduction   ................................................................................... .........  ..........  1 11
Summary.............................................................................................................          146
Chapter 7: Ferrite Processing ................................................................................ 151
Introduction................................................................................................... 151
Powder Preparation-Raw Materials Selection ................................................ 151
Nonconventional Processing .............................................................................                      163
Nanocrystalline Ferrites ...................................................................................... 166
Powder Preparation of Microwave Ferrites....................................................... 174
Hard Ferrite Powder Preparation......................................................................... 175
Chapter 8: Applications and Functions of Ferrites ...........................................217
Introduction...................................................................................................              217
History of Ferrite Applications ......................................................................... 217
General Categories of Ferrite Applications....................................................... 218
Ferrites at D.C. Applications............................................................................... 219
Power Applications......................................................................................... 219
Entertainment Applications.....................................................................                    .... 221
High Frequency Power Supplies ....................................................................... 223
Microwave Applications ..................................................................................... 224
Magnetic Recording Applications...................................................................                          . 224
Miscellaneous Applications ................................................................................ 226
Summary .............................................................................................................        226
Chapter 9: Ferrites for Permanent Magnetic Applications .............................227
Introduction......................................................................................................           227
History of Permanent Magnets............................................................                            ......... 227
General Properties of Permanent Magnets ........................................................ 228
Types of Hard Ferrites Materials....................................................................... 232
Criteria for Choosing a Permanent Magnet Material......................................... 232
Stabilization of Permanent Magnets.................................................................... 237
Cost Considerations in Permanent Magnet Materials........................................ 237
Cost of Finished Magnets................................................................................... 238
Optimum Shapes of Ferrite and Metal Magnets............................................... 238
Recoil Lines-Operating Load Lines............           ................................................ 238
Commercial Oriented and Non-Oriented Hard Ferrites.................................. 238
Summary.............................................................................................................         242
Chapter 10: Ferrite Inductors and Transformers for Low Power Applications243
Introduction...................................................................................................               243
Inductance ...........................................................................................................       244
Effective Matnetic Parameters .......................................................................... 245
Measurements of Effective Permeability .......................................................... 247
Magnetic Considerations: Low-Level Applications............................................ 248
Flux Density Limitations in Ferrite Inductor Design                        ........................................ 260
Surface-Mount Design for Pot Cores................................................................ 262
Low Level Transformers................................................................................... 262
Ferrites for Low-Level Digital Applications .................................................. 266
ISDN Components and Materials......................................................................... 268
Low Profile Ferritecores for Telecommunications.............................................. 269
Multi-Layer Chip Inductors and LC Filters....................................................... 270
Chapter 11: Ferrites for EMI Suppression........................................................273
Introduction...................................................................................................               273
The Need for EMI Suppression Devices ........................................................... 273
Materials for EMI Suppression          ......................................................................... 275
Frequency Characteristics of EMI Materials..................................................... 278
The Mechanism of EMI Suppression ................................................................ 279
Components for EMI Suppression .................................................................... 281
Differential Mode Filters.................................................................................... 286
Chapter 12: Ferrites For Entertainment Applications-Radio and TV...........291
Introduction...................................................................................................              291
Ferrite TV Picture Tube Deflection Yokes........................................................ 291
Materials for Deflection Yokes ......................................................................... 293
Flyback Transformers ......................................................................................... 297
General Purpose Cores for Radio and Television.............................................. 299
Ferrite Antennas for Radios ................................................................................ 300
Summary .............................................................................................................        306
Chapter 13: Ferrite Transformers and Inductors at High Power.....................307
Introduction.......................................................................................................          307
The Early Power Applications of Ferrites......................................................... 307
Power Transformers ...................................................................................... 308
Frequency-Voltage Considerations .............................................................. 308
Frequency-Loss Considerations........................................................................ 309
The Hysteresis Loop for Power Materials......................................................... 310
Inverters and  Converters ..................................................................................... 312
Choosing the Right Component for a Power Transformer ................................ 313
Choosing the Best Ferrite Material     .................................................................. 314
Permeability Considerations .....................................                .................................        318
Output Power Considerations.............................................................................. 319
Power Ferrites VS Competing Magnetic Materials........................................... 320
Power Ferrite Core Structures ............................................................................. 320
Planar Technology               .............................................................................................. 330
High Frequency Applications.............................................................................. 324
Determining the Size of the Core.....................................................................                  . 324
Aids in Power Ferrite Core Design                    ................................................................... 324
Competitive Power Materials for High Frequency............................................ 346
Ferroresonant Transformers ................................................................................ 347
Power Inductors .................................................................................................. 348
Chapter 14: Ferrites for Magnetic Recording...................................................353
Introduction...................................................................................................                   353
Other Digital Magnetic Recording Systems...................................................... 358
Magnetic Recording Media................................................................................. 361
Magnetic Recording Heads ............................................................................... 362
Magnetoresistive Heads                .................................................................................... 362
Chapter 15: Ferrites for Microwave Applications...........................................                                                           375
Introduction...................................................................................................                   375
The Need for Ferrite Microwave Components...............................                     .................. 375
Ferrite Microwave Components...................................................................... 376
Commercially Available Microwave Materials................................................. 384
Summary ............................................................................................................              384
Chapter 16: Miscellaneous Ferrite Applications.............................................387
Introduction...................................................................................................                   387
Summary .............................................................................................................             393
Chapter 17: Physical, Mechanical and Thermal Aspects of Ferrites...............395
Introduction...................................................................................................                   396
Summary .............................................................................................................401
Chapter 18: Magnetic Measurements on Ferrite Materials and Components.403
Introduction......................................................................................................... 403
Measurements of Magnetic Field Strength........................................................            403



Library of Congress subject headings for this publication: Ferrites (Magnetic materials)