OVERVIEW

The course is characteristic for the inorganic - physical chemistry address

LEARNING OUTCOMES

The course has the objective to present to the student the effect of a magnetic field on different systems.  The effect of a magnetic field on a gas, a liquid or a solid (organic or inorganic) will be studied.  The main thecnological materials and compounds with applicative properties will be carefully analysed: permanent magnets, soft magnets, magnetic steels.

Teaching methods

Oral lessons and laboratory experiments

all the lessons will be introduced by slides (AULAWEB download) achievable before the beginning.

SYLLABUS/CONTENT

Magnetic properties

Introduction –Units in magnetism. SI and C.G.S. systems.

Origin of the magnetic moment:  Orbital and spin magnetic moment from quantum mechanics.meccanica quantistica.  Hund rules and Russell-Saunders coupling. Diamagnetism: Origin ol diamagnetism; diamagnetic substances; Pascal law.  Paramagnetism: Langevin theory; quantum mechanics treatment and Brillouin function;  Curie and Curie-Weiss laws.

Magnetism in transition metal complexes. Paramagnetism of conduction electrons; Landau diamagnetism .

Ordered magnetic systems:  Weiss Theory, Heisenberg model, Band model; Superexchange Theory; RKKY Theory. 

Magnetic anisotropy; magnetic domains, the hysteresis cycle; Remanence and coercive field.

Ferromagnetism: Stoner-Wohlfart model, dependence form magnetic field and temperature.

Antiferromagnetism: Molecular field Theory; metamagnetic transitions (first and second order); spin-flip and spin-flop transitions

Ferrimagnetism: Molecular Field Theory; dependence from temperature and magnetic field; compensation temperature; Rare Earth - transition metals compounds

Superparamagnetism: Langevin Theory applied to superparamgnetic nanoparticles; Blocking Temperature  

Molecular Magnetism: Interazioni di scambio in sistemi di spin organici. Blaney-Bowers Theory; exchange interactions in organic spin systerms.

Hard and soft magnets; magnetic steels

Laboratory:

Magnetic flux measure of different permanent magnets

a.c. magnetic susceptibility measurements on magnetic nanoparticles dispersed in liquid

SQUID magnetometry of a commercial permanent magnet

RECOMMENDED READING/BIBLIOGRAPHY

O'Handley Modern magnetic materials

J.M.D.Coey Rare earth-iron permanent magnets

Exam Board

FABIO MICHELE CANEPA (President)

CRISTINA ARTINI

DAVIDE PEDDIS (President Substitute)

MASSIMO OTTONELLI (Substitute)

Teaching methods

Oral lessons and laboratory experiments

all the lessons will be introduced by slides (AULAWEB download) achievable before the beginning.

LESSONS START

From October 19  2020

Exam description

oral exam. 

Assessment methods

The preparation of the student will be evaluated by his ability to solve experimental and theoretical simple problems.

Exam schedule