Outline
- Diamagnetism
W
- Paramagnetism W
- Ferromagnetism W
- Curie temperature W
- Curie-Weiss law W
- Exchange
- Mean field theory
- Antiferromagnetism W
- Ferrimagnetism W
- Magnetite
W
- Spinel crystal structure W
- Magnetic domains W
- Anisotropy energy
- Hard axis, easy axis
- Bloch walls W
- Remnant magnetization
- Coersive field
- Hard magnets and soft magnets
- Superparamagnetism W
- Spin glass W
- Magnons W
- Giant magnetoresistance W
- Magnetoresistive Random Access Memory W
- Magnetic force microscope
W
Reading
Kittel chapters 11, 12
For the exam you should be able to
- explain why all materials have a diamagnetic response and why the current that flows does not dissipate energy
- explain the form of the paramagnetic susceptibility as a function of temperature for regular paramagnetism and for Pauli paramagnetism
- describe the magnetization of a paramagnetic material as a function of field and temperature (this dependence is given by a Brillouin function)
- explain how the exchange energy is calculated
- plot the magnetization of a ferromagnet, an antiferromagnet, and a ferrimagnet as a function of temperture and magnetic field
- plot the susceptibility of a ferromagnet, an antiferromagnet, and a ferrimagnet as a function of temperature
- give at least one example of a diamagnetic material, a paramagnetic material, a ferromagnetic material, a ferrimagnetic material, an antiferromagnetic material, a hard magnetic material and a soft magnetic material
- define: diamagnetism, paramagnetism, Brillouin function, ferromagnetism, ferrimagnetism, antiferromagnetism, Curie law, Curie-Weiss law, Curie temperature, Neel temperature, Hund's rules, magnetic domains, anisotropy energy, hard magnets, soft magnets, Bloch wall, permeability, remnant field, coercive field, and mean field theory
