All readings are sections from the course textbook - O’Handley, R. C. Modern Magnetic Materials, Principles and Applications. New York: John Wiley and Sons, 1999. ISBN: 9780471155669.
| LEC # | TOPICS | READINGS |
|---|---|---|
| 1 |
Introduction Course Ground Rules and Overview Approach: Microscopic to Macroscopic, Impact of Magnetism on Technology (Power, Recording, Magneto-mechanical, Transportation, Security, Sensors, Actuators), Basic Scientific Questions in Magnetism |
1.2, 1.3.2, 1.4, 1.4.3, 1.5, 1.6.1 |
| Classical Magnetism | ||
| 2 |
Magnetostatics Origin of Magnetic Fields in and about Magnetized Materials Maxwell’s Equations Give Boundary Conditions on B and H |
2.1-2.4 |
| 3 |
Magnetostatics (cont.) Demagnetization Factors Quantitative Magnetostatics and Fields Due to Periodic Domains |
2.6 |
| 4 |
Where Do Magnetic Moments Come From? Classical Free Electron Theory of Magnetism Orbital Gyromagnetic Ratio Diamagnetism, Paramagnetism |
3.1-3.3, 3.4-3.5 (light), 3.5.2 |
| Quantum Mechanics and Magnetism in Oxides and Metals | ||
| 5 |
Spin, Anomalous Zeeman Effect, and Ferromagnetism Spin Quantum Numbers: l, s, j Gyromagnetic Ratios for Orbital and Spin Moments Quantum Theory of Paramagnetism Extend Quantum Paramagnet via Graphical and Analytic Solution for Brillouin Function for Ferromagnetism |
3.5.3, 3.6 (skip 3.6.1, 3.6.2), 3.7.1, 3.7.2 |
| 6 |
Exchange in Insulators Quantum Origin of Magnetism Intra-atomic, Hund’s Rules Superexchange, in Oxides, Internal Pressure of Magnetism |
4.1 (concepts), Fig. 4.3, 4.1.6, 4.2, 4.3, 4.4 |
| 7 |
Bonding and Magnetism Molecular Orbitals in Metals Slater Pauling Curves, Curie Temperature Band Theories of Magnetism |
5.1, 5.2, 5.3 (partial), 5.4-5.6 |
| Magnetic Energies | ||
| 8 |
Magnetic Anisotropy Magnetic Anistropy Data, Energy to Magnetize, Phenomenology Ingredients of Magnetic Anisotropy Anisotropy in Metals and Insulators, Temperature Dependence |
6.1, 6.2, 6.3 (concepts), 6.4(concepts), 6.5 (refer to 2.5) |
| 9 |
Torque Measurement of Magnetic Anisotropy Observations of Magnetostriction, Macroscopic Phenomenology, Data for Metals and Oxides |
7.1, 7.2 (some quant.), 7.3, 7.4 (concepts) |
| 10 |
Magnetoelastic Anisotropy Influence of Stress on Magnetization Temperature Dependence Measurement Techniques |
7.5-7.6 (concept), 7.7 Appendix 7A (summary of Zeeman, anisotropy) |
| 11 |
Magnetic Domain Walls and Domains Exchange Energy, Width and Energy Density of Domain Walls Bloch vs. Néel Walls |
8.1, 8.2, 8.3.2, 8.4, 8.5, 8.5.1 |
| 12 |
Magnetic Domains Magnetic Domains, Closure Domains, Domains in Thin Films and Fine Particles Single Domain Particles, Superparamagnetism |
8.6, 8.7 |
| 13 |
Lab Experience M-H Hysteresis Loops using Vibrating Sample Magnetometer (VSM) Magnetization versus Field and Temperature using VSM Torque Curves for Magnetic Anisotropy using Torque Magnetometer |
|
| 14 | Analysis and Discussion of Lab Results | |
| 15 |
Magnetization Processes Macroscopic Quasistatic Approach: Applied Field, Anisotropy, Magneostriction, and Dipole Energies Euler Equations and Boundary Conditions to Calculate Reversible Rotation Emphasize How Anisotropy, Magnetostriction, Resistivity affect Soft Magnetic Behavior Microwave Magnetism Ferromagnetic Resoanance |
9.1, 9.2, 9.3.1 -9.3.3, 9.4 (qualitative), 9.5 |
| 16 | Written Mid-term Exam | |
| Magnetic Materials and Applications | ||
| 17 |
Soft Ferromagnetic Materials Behavior Soft Ferromagnetic Materials Behavior, Si-Fe, Fe-Ni, Fe-Co Alloys and Soft Ferrites Amorphous and Nanocrystalline Alloys DC Rotation Permeability, Irreversible Rotation AC Behavior, Skin Depth, Applications Hysteresis Loss and Eddy Current Loss |
10.1-10.6 |
| 18 |
Amorphous Magnetism Amorphous Magnetism, Competing Interactions Exchange Fluctuations, Random Anisotropy, Resistivity Models of Amorphous Magnetism, Alloy Effects vs. Disorder |
11.1, 11.2, 11.4.1, 11.4.3, 11.5 |
| 19 |
Nanocrystalline Magnetic Materials Exchange Fluctuations, Random Anisotropy Effects on Properties with Length Scale |
12.1-12.3 |
| 20 |
Hard Magnetic Materials _M-H, B-H, (B-H)_max, Fine Particles, Nucleation, Pinning Materials: Alnico, Ba Ferrite, Co-RE, Fe-RE-B |
13.1, 13.2 (concept), 13.4, 13.5 |
| 21 |
Transport in Magnetic Materials Electrical Conductivity of Metals and Alloys in Light of Electronic Structure Hall Effect and Magnetoresistance (MR), MR Heads, Mechanisms of Spin Scattering, Giant MR, Spin Tunneling |
15.1-15.6, 15.7 (concept) |
| 22 |
Surface and Thin Film Magnetism Surface Electronic Structure and Magnetism, Surface Moments, Metastable Phases, Misfit Strain, Epitaxial Growth, Surface Magnetic Anisotropy and Magnetostriction, Domains, Devices |
16.1-16.4 |
| 23 |
Magnetic Recording Physics of Recording Basic Concepts of Recording Media and Heads, Karlkvist Fields, Noise |
17.1-17.4 |
| 24 |
Magnetic Recording Materials Particulate: y Fe2O3 CrO2, Co-Ferric Oxide, Barium Ferrite Thin Film Media: Longitudinal, Perpendicular Thin Film Heads, MR Heads, Spin Valves, Magnetic Random Access Memories |
17.5-17.6 |
| 25-26 | Oral Presentations by Students (20-30 minutes) | |
