School of Physics

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)