Magnetism

Lecturers: David Crew / Robert Woodward

• Introduction
  

  • Why study magnetism?

  • Magnetic Materials

  • Magnetic Fields -- B and H

  • Magnetisation M

• Diamagnetism and Paramagnetism

  • Linear magnetic materials

  • Hund's Rules

  • Curie Law (low field behaviour)

  • Saturation Effects (high field behaviour)

  • Quenching of the Orbital magnetic moment

  • Paramagnetism of conduction electrons

• Ordered Magnetic Materials

  • Ferromagnetism

  • Weiss molecular field and theory of spontaneous magnetisation

  • Curie-Weiss Law

  • Exchange field

  • Collective Electron Model

• Production and Measurement of Magnetic Fields

• Technical Magnetism

  • Domains

  • Domain Structures

  • Magnetisation processes

  • Energy in Magnetic Systems

• Magnetic Domains

  • Boundaries

  • Nucleation and Growth

  • Domain Wall Pinning

  • Activation

  • Stoner-Wohlfarth single domain theory

• Magnetic Materials and Applications

• Review

• For the 3 Point unit (Magnetism 425) there will be 2 Assignments (30%) and a two hour Exam (70%)

• For the 6 Point unit (Magnetism and Magnetic Materials 410) there will be 3 Assignments (45%), one laboratory (15%) and a two hour Exam (40%)

Lecture Notes and Assignments

Lecture notes are available in pdf format. They consist of copies of the overheads used in lectures and some additional comments on the material.

NOTE: For some reason the links don't work so well in Safari. Either use a different web browser to download them, or insert 'www.physics.uwa.edu.au' in front of the link Safari tries (and fails) to use.

Introduction (pdf: 348K)

Fields and Magnets (pdf: 2.4 MB) (Generation of magnetic fields and the measurement of fields and magnetisation)

Technical Magnetism (pdf: 3.6 MB) (Hysteresis loops, domains and free energy in magnetic systems)

Technical Magnetism 2 (pdf: 4.7 MB) (Magnetic domains and imaging, magnetisation mechanisms, time dependence and superparamagnetism)

Atomic Magnetism (pdf: 256K)(Diamagnetism and Paramagnetism)

Ferromagnetism (pdf: 264K)(Ordered magnetic materials)

Notes (pdf: 92K) on Collective electron theory and isentropic demagnetisation

Magnetic Materials (pdf: 1.0 MB) (notes on permanent magnets soft magnets and composites)

Detailed Notes (pdf: 1.1 MB) on many aspects of magnetism (prepared by Prof. Bob Street).

Assignments

Assignment 1a (pdf: 84K) (magnetic circuits)

Assignment 1b (pdf: 36K) (solenoids)

Assignment 1c (pdf:180K) (domains and particles)

Assignment 2a (pdf: 28K) (paramagnetism, diamagnetism)

Assignment 2b (pdf: 88K) (Ferromagnetism, Weiss Theory)

Assignment 2c (pdf: 176K) (Stoner Collective Electron Theory)