OVERVIEW

The course is characteristic for the inorganic - physical chemistry address

AIMS AND CONTENT

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

TEACHERS AND EXAM BOARD

Exam Board

FABIO MICHELE CANEPA (President)

DAVIDE PEDDIS

LESSONS

Class schedule

The timetable for this course is available here: Portale EasyAcademy

EXAMS

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