3.45 Magnetic Materials, Spring 2004

Instructor:
Dr. Robert O'Handley

Course Description

This course will cover the following topics:

• Magnetostatics
• Origin of magnetism in materials
• Magnetic domains and domain walls
• Magnetic anisotropy
• Reversible and irreversible magnetization processes
• Hard and soft magnetic materials
• Magnetic recording

Special topics include magnetism of thin films, surfaces and fine particles; transport in ferromagnets, magnetoresistive sensors, and amorphous magnetic materials.

Materials Science and Engineering 224

Magnetism and Magnetic Materials

Prof. Yuri Suzuki

This course covers the fundamentals of magnetism and magnetic materials in the first two thirds pf the class. Topics include classical versus quantum mechanical pictures, diamagnetism, paramagnetism, crystal field environments, dipolar and exchange interactions, ferrromagnetism, antiferromagnetism, magnetic domains, magnetic anisotropy and magnetostriction. Magnetic materials covered include transition metals, their alloys and pxides, rare earths and their oxides, organic and molecular magnets, etc. Throughout the course, experimental techniques in magnetic characterization will be discussed. The second part of the course will focus on particular magnetic materials and devices that are of technological interest ( e.g., magnetoresistive and magneto-optical materials and devices). Additional topics include biomagnetism and spin glasses.

The purpose of this course is to introduce students to fundamental concepts in magnetism and to apply them to our understanding of magentic materials and devices in the world around us. The coursework assumes knowledge of basic electromagnetism, familiarity with some quantum mechanics and a course either in electronic properties of materials (Mat Sci 111) or an introductory solid state physics course. Through the lectures and readings from the text as well as the literature, students will develop an understanding of basic concepts in magnetism and how to apply them to advanced materials and devices. Materials used in devices for information storage, power and medical applications will be addressed.

This course will meet two times a week for ninety minutes. Students will be required to attend class and submit weekly homework assignments to enforce the fundamental concepts in magnetism. An exam on these fundamental concepts will be given during the semester. In lieu of a final exam, the student will submit a final paper, on a topic of his/her choice related to magnetism, along with a final presentation to the entire class.

TEXTBOOKS and REFERENCES

1. Spaldin, “Magnetic Materials,” REQUIRED TEXT
2. O’Handley, “Modern Magnetic Materials”
3. Cullity, “Introduction to Magnetic Materials” for a classical magnetism reference
4. Chikazumi,”Physics of Magnetism” for a reference with
5. Bozorth, “Ferromagnetism” for a compendium of materials information in addition to fundamental magnetism section
6. Blundell, “Magnetism in Condensed Matter” for a more physics perspective with a good background in quantum mechanics and electromagnetism

Introduction to Magnetism and Magnetic Materials

Second Edition

David C. Jiles

Wolfson Centre for Magnetics Technology, Cardiff University

List Price: $66.95
Cat. #: NT1121
ISBN: 9780412798603
ISBN 10: 0412798603
Publication Date: 6/16/1998
Number of Pages: 568

Introduces each section with a question that is subsequently answered through the text of the section

Reinforces learning with more than 60 sample problems and complete solutions

Lists extensive references to principal publications in magnetism at the end of each chapter

Covers topics such as magnetic fields, magnetic measurements, magnetic materials, magnetic properties, hard and soft magnetic materials, and magnetic recording

Offers an unparalleled assessment of magnetic properties and applications

Few subjects in science are more difficult to understand than magnetism, according to Encyclopedia Britannica. However, there is a strong demand today for scientists and engineers with skills in magnetism because of the growing number of technological applications utilizing this phenomenon. This textbook responds to the need for a comprehensive introduction of the basic concepts of the science.

Introduction to Magnetism and Magnetic Materials has been thoroughly revised since the first edition to include recent developments in the field. The early chapters comprise a discussion of the fundamentals of magnetism. These chapters include more than 60 sample problems with complete solutions to reinforce learning. The later chapters review the most significant recent developments in four important areas of magnetism: hard and soft magnetic materials, magnetic recording, and magnetic evaluation of materials. These later chapters also provide a survey of the most important areas of magnetic materials for practical applications. Extensive references to the principal publications in magnetism are listed at the end of each chapter, which offer the reader rapid access to more specialized literature.

Students in various scientific areas will benefit from this book, including those in physics, materials science, metallurgy, and electrical engineering.

Table of Contents
PART 1: ELECTROMAGNETISM - MAGNETIC PHENOMENA ON THEMACROSCOPIC SCALE

MAGNETIC FIELDS
The Magnetic Field
Magnetic Induction
Magnetic Field Calculations
References
Further Reading
Exercises

MAGNETIZATION AND MAGNETIC MOMENT
Magnetic Moment
Magnetic Poles and Amperian Bound Currents
Magnetization
Magnetic Circuits and Demagnetizing Field
Penetration of Alternating Magnetic Fields into Materials
References
Further Reading
Exercises

MAGNETIC MEASUREMENTS
Induction Methods
Force Methods
Methods Depending on Changes in Material Properties
SQUIDS
References
Further Reading
Exercises

MAGNETIC MATERIALS
Classification of Magnetic Materials
Magnetic Properties of Ferromagnets
Different Types of Ferromagnetic Materials for Applications
Paramagnetism and Diamagnetism
References
Further Reading
Exercises

MAGNETIC PROPERTIES
Hysteresis and Related Properties
The Barkhausen Effect and Related Phenomena
Magnetostriction
Magnetoresistance
References
Further Reading
Exercises

PART 2: MAGNETISM IN MATERIALS - MAGNETIC PHENOMENA ON THE MICROSCOPIC SCALE

MAGNETIC DOMAINS
Development of Domain Theory
Energy Considerations and Domain Patterns
References
Further Reading
Exercises

DOMAIN WALLS
Properties of Domain Boundaries
Domain-wall Motion
References
Further Reading
Exercises

DOMAIN PROCESSES
Reversible and Irreversible Domain Processes
Determination of Magnetization Curves from Pinning Models
Theory of Ferromagnetic Hysteresis
Dynamics of Domain Magnetization Processes
References
Further Reading
Exercises

MAGNETIC ORDER AND CRITICAL PHENOMENA
Theories of Paramagnetism and Diamagnetism
Theories of Ordered Magnetism
Magnetic Structure
References
Further Reading
Exercises

ELECTRONIC MAGNETIC MOMENTS
Classical Model of Magnetic Moments of Electrons
Quantum Mechanical Model of Magnetic Moments of Electrons
Magnetic Properties of Free Atoms
References
Further Reading
Exercises

QUANTUM THEORY OF MAGNETISM
Electron-electron Interactions
The Localized Electron Theory
The Itinerant Electron Theory
References
Further Reading
Exercises


PART 3: MAGNETICWS - TECHNOLOGICAL APPLICATIONS

SOFT MAGNETIC MATERIALS
Properties and Applications
Materials for AC Applications
Materials for DC Applications
Materials for Magnetic Shielding
References
Further Reading

HARD MAGNETIC MATERIALS
Properties and Applications
Permanent Magnet Materials
References
Further Reading

MAGNETIC RECORDING
Magnetic Recording Media
Recording Heads and the Recording Process
Modeling the Magnetic Recording Process
References
Further Reading

MAGNETIC EVALUATION OF MATERIALS
Methods for Evalulation of Intrinsic Properties
Methods for Detection of Flaws and Other Inhomogeneities
Magnetic Imaging Methods
Conclusions
References
Further Reading

SOLUTIONS
APPENDICES
AUTHOR INDEX
SUBJECT INDEX

Physics of Ferromagnetism

Physics of Ferromagnetism

Second Edition

Soshin Chikazumi

Translation editor: C. D. Graham

Price: £165.00 (Hardback)
ISBN-10: 0-19-851776-9
ISBN-13: 978-0-19-851776-4
Publication date: 27 February 1997
Clarendon Press
668 pages, halftones, numerous line figures, tables, 240x168 mm
Series: International Series of Monographs on Physics number 94

Description

· Includes recent developments and techniques in magnetics · Describes magnetic phenomena intuitively and comprehensively

Readership: Graduate students and researchers in magnetism including departments of physics, materials science and materials engineering.

Contents

1. Magnetostatic phenomena 2. Magnetic measurements 3. Atomic magnetic moments 4. Macroscopic experimental techniques 5. Magnetic disorder 6. Ferromagnetism 7. Antiferromagnetism and ferrimagnetism 8. Magnetism of metals and alloys 9. Magnetism of ferromagnetic oxides 10. Magnetism of compounds 11. Magnetism of amorphous materials 12. Magnetocrystalline anisotrophy 13. Induced magnetic anisotropy 14. Magnetostriction 15. Observation of domain structures 16. Spin distribution and domain walls 17. Magnetic domain structure 18. Technical magnetization 19. Spin phase transition 20. Dynamic magnetization 21. Various phenomena association with magnetization 22. Engineering applications of magnetic materials

Authors, editors, and contributors

Soshin Chikazumi, Professor Emeritus, University of Tokyo Translation editor: C. D. Graham, Professor Emeritus, University of Pennsylvania

Modern Magnetic Materials: Principles and Applications

Modern Magnetic Materials: Principles and Applications

Robert C. O'Handley

ISBN: 978-0-471-15566-9

Hardcover

768 pages

November 1999

Table Of Contents

Introduction and Overview.

Magnetostatics.

Classical and Quantum Phenomenology of Magnetism.

Quantum Mechanics, Magnetism, and Exchange in Atoms and Oxides.

Quantum Mechanics, Magnetism, and Bonding in Metals.

Magnetic Anisotropy.

Magnetoelastic Effects.

Magnetic Domain Walls and Domains.

Magnetization Process.

Soft Magnetic Materials.

Amorphous Materials: Magnetism and Disorder.

Magnetism in Small Structures: Exchange Coupling and Nanocrystals.

Hard Magnetic Materials.

Magnetic Annealing and Directional Order.

Electronic Transport in Magnetic Materials.

Surface and Thin-Film Magnetism.

Magnetic Recording.

Appendices.

Index.