|SCIENTIFIC DISCIPLINARY SECTOR||CHIM/02|
The course Physical Chemistry of Magnetic Materials is a characterizing course of inorganic-physical chemistry curriculum focused on the theoretical and experimental aspects of the physical chemistry of the magnetic materials.
The teaching will provide the student with the basic elements of the physical chemistry of magnetic materials. Through the correlation of morpho-structural features, chemical-physical properties, and synthetic techniques the student will be trained in the design of both massive and nanostructured magnetic materials for specific applications.
In the framework of the materials science and technology degree program, the skills acquired in the course are to be considered particularly suitable for the Materials Scientist: Research Specialist profile. On the other hand, the topic related to the technological applications of permanent magnets provides skills that are also suitable for the profile Materials Scientist: Specialist in Technology
Background in Mathematics, General Physics and general Chemistry is recommended
Lectures. Laboratory activity. Classroom attendance is strongly recommended, and it is considered essential to perform experimental activity.
Introduction-units of measurement in magnetism. SI and c.g.s system. Origin of magnetic moment: Orbital magnetic moment and Spin magnetic moment in quantum mechanics. Fundamental states and Hund's Rules. Coupling (Russell-Saunders, jj). Diamagnetism: Origin of diamagnetism; Classification of diamagnetic substances; Pascal's Law of Additivity. Paramagnetism: Treatment according to Langevin's Theory; Treatment according to quantum mechanics (Boltzmann equation and Brillouin function); Curie's law, Curie-Weiss law. Magnetism in transition metal complexes, Valence bond theory, Crystalline field theory. Paramagnetism of conduction electrons. Ordered magnetic systems: Weiss theory, Heisenberg model, Band model. RKKY theory Ferromagnetism: Stoner-Wohlfart model, Phenomenological aspects. Magnetic anisotropy. Magnetic domains. The hysteresis loop. Saturation induction. Remanence . Coercive field. Antiferromagnetism: Molecular Field Theory, Metamagnetic transitions: first- and second-order transitions. Spin-flop transitions. Spin-flip transitions. Ferrimagnetism: Dependence of M on T and H. the compensation temperature. Molecular field theory in ferrimagnetic systems. Permanent magnets. Superparamagnetism: Langevin theory applied to superparamagnetic particles. Blocking temperature. Definition of critical radius of superparamagnetic particle. Molecular magnetism: Exchange interactions in organic spin systems. Blaney-Bowers theory. Study of some technological aspects of magnetism. Hard magnets, soft magnets, magnetic steels. Two practical laboratory exercises related to the study of magnetic properties of materials will be offered. The detailed course program will be discuissed with students during the course.
S. Blundell, Magnetism in condensed matter. Oxford: Oxford Univesity Press, 2001.
J.M.D. Coey, Magnetism and Magnetic Materials, Cambridge University Press, New York, 2010.
D. Peddis, P. E. Jönsson, S. Laureti, and G. Varvaro, Magnetic interactions: A tool to modify the magnetic properties of materials based on nanoparticles, vol. 6. 2014.
G. Muscas, N. Yaacoub, and D. Peddis, Novel Magnetic Nanostrucures Unique properties and applications. Amsterdam, Netherlands: Elsevier, 2019.
Office hours: All days by appointment
DAVIDE PEDDIS (President)
The schedule of classes is published @ https://chimica.unige.it/didattica/orari_SC
All class schedules are posted on the EasyAcademy portal.
The examination lasts about 1 hour and is conducted in the presence of two professors from the subject area.
The oral examination is conducted by two faculty members and it will take at least 45 minutes. The oral exam aims to test the knowledge of the course subject, and the problem-solving ability of the students.