| CODE | 72245 |
|---|---|
| ACADEMIC YEAR | 2019/2020 |
| CREDITS | 5 credits during the 3nd year of 8765 Material Science (L-30) GENOVA |
| SCIENTIFIC DISCIPLINARY SECTOR | FIS/03 |
| LANGUAGE | Italian |
| TEACHING LOCATION | GENOVA (Material Science) |
| SEMESTER | 1° Semester |
| MODULES | This unit is a module of: |
| TEACHING MATERIALS | AULAWEB |
The course is divided into two modules.
The module I aims to provide students with an introduction to the magnetic properties of materials and their thermal properties.
The course aims to: describe a wide range of techniques and experimental data relating to thermal, electrical and magnetic properties, to provide basic interpretation models for their understanding and to define the characteristic parameters of materials.
Classroom front lectures with traditional dribbling and Power Point presentations made available on Aulaweb.
Laboratory Exercises:
Use of the Matter Fsica Didactic Laboratory (PF4 DIFI) for Auger Spectroscopy.
Demonstration by using XPS source at DIFI search laboratories (PF2, L 200).
Students participate in laboratory activities in small groups and a group must submit a written report aleno 7 days prior to the examination. In this report they must be presented: the purpose of the experience, a brief description of the experimental apparatus used, the data acquisition and their critical analysis.
THEORETICAL PART
Phenomenological classification of materials with respect to magnetic properties.
Definition of magnetic moment.
Pairing agent on a magnetic moment.
Summary of B, H and M vectors
Observations on carrier potential.
Hamiltonian of an atom in an external magnetic field (independent electrons).
Diamagnetism. Quantum treatment
Larmor Precession.
Paramagnetism. Classical treatment and quantum treatment.
Magnetic moment of an atom and an ion: Hund rules.
Magnetic moment of ions 3d and 4f.
Effect of the crystalline field on the order of level fillings.
Introduction to Ferromagnetism.
Introduction to the exchange integer: two electrons wave function. Single and triplet states.
Magnetic Sorting Types:
Antiferromagnetic, ferrimagnetic, helix sorting
Aces of easy and difficult magnetization. Energy of magnetocrystalline anisotropy.
Estimating the size of domain edges.
Nothing to magnetostriction.
Hysteresis cycle: coercive field, residual magnetization, saturation magnetization.
Gentle and hard ferromagnetics and examples of their applications.
Pauli Paramagnetism.
Introduction to thermal properties.
Heat Temperature Dependency Dependence Summary.
Specific heat abnormalities.
Definition of linear and volumetric expansion coefficient.
Gruneisen's constant
Definition of thermal conductivity.
First and Second Fourier Law.
Microscopic Description of Thermal Conductivity.
Relaxation time and average free porters walking.
Relaxation time. Scattering mechanisms.
Dependence of electronic thermal conductivity from temperature. Role of defects and impurities-
Phononic contribution to thermal conductivity. Grain edge scattering and punctual defects. Processes umklapp.
LABORATORY EXERCISES
Auger Spectroscopy
X ray Photoemission Spectroscopy
S. Blundell: Magnetism in condensed matter Oxford Master Seires in Condensed Matter Physics.
R. Berman, Thermal conductivity in solids Clarendon Press (1976)
Slides and material posted on Aulaweb.
DANIELE MARRE' (President)
LUCA VATTUONE (President)
EMILIO BELLINGERI
ELENA PUTTI
Classroom front lectures with traditional dribbling and Power Point presentations made available on Aulaweb.
Laboratory Exercises:
Use of the Matter Fsica Didactic Laboratory (PF4 DIFI) for Auger Spectroscopy.
Demonstration by using XPS source at DIFI search laboratories (PF2, L 200).
Students participate in laboratory activities in small groups and a group must submit a written report aleno 7 days prior to the examination. In this report they must be presented: the purpose of the experience, a brief description of the experimental apparatus used, the data acquisition and their critical analysis.
The exam consists of an oral exam.
As a rule, a question is asked about agomentals of the I module and one on the arguments of the second, ranging from the whole program. Eventually, any criticisms emerged from the examination of laboratory relationships are discussed. The evaluation of laboratory reports by class (A, B, C, D: in descending order of which) is communicated to the student at the beginning of the oral examination.
The final vote is determined by the weighted average of the two parties and the overall trial of laboratory reports, with an indicative weight of one third each.
Examination is carried out jointly with module II.
The questions asked during the examination are intended to determine the degree of understanding of the subject chosen by the committee.
They evaluate the completeness of preparation, clarity, ability to frame the subject, the overall basic knowledge of the physics of materials and the ability to correlate property and structure of materials.
Examining laboratory reports provides the basis for an assessment of the ability to apply the acquired knowledge for the interpretation of experimental data and the ability to effectively present the results obtained.
| Date | Time | Location | Type | Notes |
|---|---|---|---|---|
| 15/06/2020 | 09:30 | GENOVA | Orale | |
| 23/07/2020 | 09:30 | GENOVA | Orale | |
| 18/09/2020 | 09:30 | GENOVA | Orale |