Supermagnets, Hard Magnetic Materials

ISBN-13: 9780792310921 / Angielski / Twarda / 1991 / 844 str.

G. J. Long; F. Grandjean; Gary J. Long

Opis

The book you are now holding represents the final step in a long process for the editors and organizers of the Advanced Study Institute on hard magnetic materials. The editors interest in hard magnetic materials began in 1985 with an attempt to better understand the moments associated with the different iron sites in Nd Fe B. These 14 moments can be obtained from neutron diffraction studies, but we qUickly realized that iron-57 Mossbauer spectroscopy should lead to a better determination of these moments. However, it was also realized that the complex Mossbauer spectra obtained for these hard magnetic materials could not be easily understood without a broad knowledge of their various structural, electronic, and magnetic properties. Hence it seemed useful to the editors to bring together scientists and engineers to discuss, in a tutorial setting, the various properties of these and future hard magnetic materials. We believe the inclusion of engineers as well as scientists in these discussions was essential because the design of new magnetic materials depends very much upon the mode in which they are used in practical devices.

Spis treści

1. Historical Background and Introduction to Hard Magnetic Materials.- 2. An Outline of the Prehistory of Magnetism.- 3. Fundamental Concepts and Units in Magnetism.- 4. Novel Permanent Magnet Materials.- 5. Structural Characteristics and Rapid Solidification of Nd2Fe14B-Type Permanent Magnet Materials.- 6. An Introduction to Crystal Field Effects in Magnetism.- 7. Crystal-Field and Exchange Interactions in Hard Magnetic Materials.- 8. Electronic Structure Calculations for Rare Earth-Transition Metal Compounds.- 9. Phase Diagrams for Permanent Magnet Materials.- 10. Intrinsic Properties and Coercivity of Sm-Fe-TM Phases.- 11. Spin-Reorientation Transitions in Intermetallic Compounds.- 12. Some Nuclear Magnetic Resonance Results on Nd-Fe-B Phases.- 13. Domain Wall NMR in Anisotropic Ferromagnets. Application to the System RE-(CoFe)-B.- 14. The Mössbauer Effect and its Application to Hard Permanent Magnetic Materials.- 15. Thermal, Magnetic, Magnetoelastic, and Transport Characterization of Hard Magnetic Alloys.- 16. Fundamentals of Magnetic Anisotropy in Rare Earth-Iron Intermetallic Compounds.- 17. Crystal Fields in Y2-xErxFe14B from Magnetic Torque Measurements.- 18. Determination of the Anisotropy Field by the Singular Point Detection Method.- 19. Micromagnetic Background of Hard Magnetic Materials.- 20. Neutron Spectroscopy and Magnetic Excitations in Supermagnets.- 21. Structure and Properties of Ternary Fe-Rich Rare Earth Carbides.- 22. Metastable Phases and their Role in Permanent Magnet Manufacturing.- 23. Preparation and Properties of Mechanically Alloyed Nd-Fe-B Magnets.- 24. Review of Permanent Magnet Applications and the Potential for High Energy Magnets.- 25. Magnet Design and Analysis Techniques.- 26. Permanent Magnet Machines.- 27. Design and Performance of Synchronous Motors with Nd-Fe-B Magnets.- 28. Alternative Topologies of Brushless DC Machines for Power Applications.- 29. Electrical Machine Design with Combined Field-Coil and Magnet Excitation.- 30. Simulation of Permanent Magnet Motor Drives.- Appendix List of ASI Participants.- Author Index.