Course

PHYS-491: Magnetism in materials

Lectures in this course (89)

Explores the Jahn Teller effect and its implications in crystal field theory.

Discusses the dipole-dipole interaction in materials and its impact on exchange interactions at typical distances of 2-3 Å.

Covers typical interactions in materials, including dipole-dipole interaction and direct exchange between magnetic ions.

Explains singlet and triplet states, exchange energy, and interactions in metallic hydrogen.

Explains the rules for interactions in materials, including semi-covalent exchange and insulators.

Discusses the double exchange interaction in materials, leading to both anti-ferromagnetic and ferromagnetic phases.

Covers the Dzyaloshinskii-Moriya interaction and its impact on material properties.

Delves into the definition of order in various states of matter, showcasing surprising material behaviors.

Explores ferromagnetism, domains, domain walls, remnant magnetization, coercive field, and the Barkhausen effect.

Explores the mean-field approach with the Weiss model for magnetic ordering in ferromagnetism and the transition to Curie law.

Explores critical exponents in ferromagnets, different models like Heisenberg, XY, and Ising, and their significance in various systems.

Covers the transition from order to disorder and the significance of scalar fields in breaking the electroweak symmetry.

Explains magnetic ordering, disordering, magnon dispersion, and excitations in materials.

Explores antiferromagnetism, order parameters, anisotropy energy, and quantum phase transitions.

Explores ferrimagnetism, unequal sublattices with a resultant ferromagnetic moment, and the complexity of magnetic ordering in cobalt systems.

Explores incommensurate magnetic order and its various patterns like helical, spiral, conical, and soliton lattices.

Explores magnetic ordering and the transition to spin-glass states in materials.

Discusses the free electron model, Pauli paramagnetism, band polarization, and orbital components.