Unit NANOMAGNETISM AND SPINTRONICS
- Course
- Physics
- Study-unit Code
- GP005936
- Location
- PERUGIA
- Curriculum
- Fisica della materia
- Teacher
- Gianluca Gubbiotti
- Teachers
-
- Gianluca Gubbiotti
- Hours
- 47 ore - Gianluca Gubbiotti
- CFU
- 6
- Course Regulation
- Coorte 2023
- Offered
- 2023/24
- Learning activities
- Affine/integrativa
- Area
- Attività formative affini o integrative
- Academic discipline
- FIS/03
- Type of study-unit
- Opzionale (Optional)
- Type of learning activities
- Attività formativa monodisciplinare
- Language of instruction
- Italian
- Contents
- Physics of magnetism and magnetic materials with low dimensionality. Fundamentals of spintronics and magnonics. Application to ICT devices.
- Reference texts
- Ibach-Luth, SOlid State Physics (Springer);
J. Stohr-H.C. Siegman, Magnetism (Springer);
D. Stancel - A. Prabhakar, Spin Waves (Springer)
S. M, Rezende Fundamentals Of Magnonics (Springer) - Educational objectives
- Understanding of the physics of magnetic materials, with particular reference to systems with nano dimensions. Knowledge of the main experimental investigation techniques and ability to carry out micromagnetic simulations. Application to ICT devices
- Prerequisites
- In order to fully understand the topics of this course it is necessary to be familiar with the basic topics of electromagnetism, physics of matter and quantum mechanics that are routinely taught in the mandatory courses of the three-year degree in physics.
- Teaching methods
- Lectures, also assisted by the projection of films and the execution of virtual experiments through simulations with micromagnetism software. Visit to nanomagnetism laboratories and realization of simple experiences related to the course content.
- Learning verification modality
- Oral exam at the end of the course, lasting about one hour. In the first part the student will be invited to expose a topic at will on which he or she has carried out an in-depth study, also drawing on the specialized literature of the sector. In the second part, the teacher will ask questions aimed at verifying the student's preparation on the program carried out.
- Extended program
- 1) Introduction to the course. Definition of relevant length and time scales. Overview of applications and theoretical approaches. Systems of units of measure. Recalls on atomic magnetism and spin-orbit interaction. Magnetism Orbital and spin magnetism. L-S and J-J coupling. Hund rules.
2) Magnetostatics, dipole magnetic moment, Einstein-de Haas effect, Larmor precession, magnetization intensity, magnetostatic potential, demagnetization field, boundary conditions for the induction field and the magnetic field.
3) Ferromagnetic materials, classical Weiss theory, molecular field and magnetic domains.
Exchange interaction and its quantum origin. Ferromagnetism. Heisenberg Hamiltonian. Dependence of magnetization on temperature. Exchange interaction between free electrons. Band model of ferromagnetism. Stoner criterion. Spin waves in the exchange regime.
4) Magnetic interactions. Magnetic anisotropy. Magnetic domains and micromagnetism. Static Micromagnetic Simulations.
5) Spin Waves - Classical Approach. Susceptibility and Ferromagnetic Resonance. General equation for the ferromagnetic resonance frequency (Suhl approach). Self-oscillations in anisotropic ferromagnets. Magnetostatic spin waves and in the exchange regime. Spin waves in thin and multilayer films.
6) Hints of nonlinear dynamics of magnetization, nonlinear ferromagnetic resonance, nonlinear propagation of spin waves
7) Quantized spin waves in confined systems. Lateral resonances, boundary conditions, spin waves in longitudinally and transversely magnetized systems, quantization of propagation waves, transformation of propagation waves.
8) Magnonic crystals. Manipulation and control of spin wave propagation. Waveguides. Excitation by inductive techniques. Nano-optics with spin waves. Magnonica
9) Static and dynamic techniques for the characterization of nanostructured magnetic materials. Vibrating sample magnetometry, alternating field gradient, magneto-optical Kerr effect, atomic and magnetic force microscopy, paramagnetic electron resonance, ferromagnetic resonance, Brillouin light spectroscopy and microscopy. Time-resolved magneto-optic effect microscopy. - Obiettivi Agenda 2030 per lo sviluppo sostenibile
- Low energy consumption ICT devices for innovative electronics to overcome current CMOS technology.