To understand the physical processes ruling the thermal and electric transport and the magnetic properties in advanced materials. To identify the key properties to be used for the choice of materials in specific applications. To learn experimental methods to characterise relevant magnetic and transport properties.
To understand the physical processes ruling the magnetic properties in materials: role of the electronic structure, of the crystal field and of the exchange integral in determining the magnetic state at different temperatures
To be able to identify the key parameters that determine the magnetic response of a material and to use this information to select the material for specific applications in particular with respect to soft and hard ferromagnets.
To be able to measure the magnetization hysteresis curve of a ferromagnet.
To understand the influence on the transport properties of multiband electronic structures and low dimensionality.
To understand physical operation mechanisms of common electronic devices.
To be able to identify the correlation between material properties and device performances.
To understand principles and peculiarities of spin polarized transport in materials and devices
To be able to write a concise but fully understandable reports about the experimental activity with clear presentation of the experimental data with their errors.
Oral lessons with presentation of the theoretical topics.
Demonstration with active role of the students in laboratory for the practical activities.
Theory (56 hours):
Phenomenological classification of materials with respect to magnetic properties, Definition of magnetic moment, Torque acting on a magnetic moment, Summary on vectors B, H, and M, Notes on the vector potential, Hamiltonian of an atom in an external magnetic field, Diamagnetism. Quantum treatment, Larmor precession, Paramagnetism. Classical treatment and notes on quantum treatment, Magnetic moment of an atom and an ion: Hund's rules, Magnetic moment of 3d and 4f ions, Effect of the crystal field on the order of level fillings, Introduction to ferromagnetism, Introduction to the exchange integral: wave function of two electrons. Singlet and triplet states, Types of magnetic ordering: antiferromagnetic, ferrimagnetic, helical ordering, Easy and hard magnetization axes, Magnetocrystalline anisotropy energy, Estimate of domain wall size, Note on magnetostriction, Hysteresis loop: coercive field, residual magnetization, saturation magnetization, Soft and hard ferromagnets and examples of their applications, Pauli paramagnetism.
Electrical, thermal, and thermoelectric transport properties in metals and semiconductors (resumé) - Effects of band structure on transport properties -Electrical, thermal, and thermoelectric transport in multiple bands materials –Transport properties in p-n junctions and metal-insulator-semiconductor junctions.
Phononic contribution to electrical and thermal conductivity - Scattering from grain boundaries and point defects - Umklapp processes - Temperature dependence of transport properties - Bloch Gruneisen law -Transport properties in advanced materials: two-dimensional materials and superconductors
Spin polarised transport, polarization and depolarization mechanisms, examples of spintronic devices
Lab (12 hours): Three experimental activities selected among the following
S. Blundell: Magnetism in Condensed Matter Oxford University Press
K.Brennan: The Physics of Semiconductors - With Applications to Optoelectronic Devices
Slides used for the lessons.
Second semester See: https://servizionline.unige.it/unige/stampa_manifesto/MF/2025/11967.html
The exams will consists of:
The degree of achievement of the learning outcomes will be determined considering:
