MAGNETIC PROPERTIES OF MATTER AND LABORATORY
Academic year and teacher
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- Versione italiana
- Academic year
- 2022/2023
- Teacher
- DIEGO BISERO
- Credits
- 6
- Didactic period
- Primo Semestre
- SSD
- FIS/03
Training objectives
- To provide basic knowledge of magnetism and magnetic materials. Introduction to the main laboratory techniques for the characterization of magnetic materials (thin films and nanostructures).
Stimulate a critical vision and a creative ability to discuss, at a the state of the art level, the research in a specific field chosen among the subjects covered during the course. Prerequisites
- Basic knowledge of Quantum Mechanics and Quantum Theory of Solids
Course programme
- Review of basics magnetostatics. Magnetization and magnetic materials. Atomic origins of magnetism
Diamagnetism. Superconductors. Paramagnetism. Langevin equation of paramagnetism. Curie's law. Quantum theory of paramagnetism. Pauli paramagnetism. (12 h)
Ferromagnetism. Ferromagnetic order. Demagnetizing field. Exchange integral. Mean field theory. Curie's temperature. Bloch law. Antiferromagnetism. Antiferromagnetic order. Neutron diffraction. Ferrimagnetism. Cubic and hexagonal ferrites. (12 h)
Ferromagnetic domains. Domain's walls. Dipolar and exchange energy. Magnetocrystalline and magnetostrictive energy. Histeresys cycles. Light matter interactions in ferromagnetic materials: principles of magneto-optics and applications. (12 h)
Magnetism in the reduced dimensionality: magnetic properties of nano-structures. Magnetoresistance. Giant magnetoresistance (GMR). Colossal magnetoresistance. Exchange bias. Magnetic data storage. Magneto-optic recording. (12 h)
Laboratory practical activities: sputter deposition of magnetic thin films. Magnetic hysteresis loops recording using magneto-optical techniques. Determination of magnetic anisotropy and study of the magnetic switching process through the analysis of the hysteresis loops. Magnetic Force Microscopy (MFM) measurements on nanostructures. (12 h) Didactic methods
- Theoretical/practical lessons.
Learning assessment procedures
- The aim of the examination is to test at which level the learning objectives stated above have been acquired. During the final test (ORAL) the teacher will check the knowledge of the topics included in the program and also the student's ability to develop new ideas, based on the description of the state of the art in one of the research areas covered during the course. In particular, the student will be offered as an optional possibility to take part of the examination in the form of a presentation of a topic of his choice, of particular importance and relevance. The topic will be such that its understanding and description will imply a good knowledge of the basic program described above. The student will discuss and summarize the contents of recent articles taken from international journals, in the presence of the other students.
Reference texts
- Nicola A. Spaldin, "MAGNETIC MATERIALS
Fundamentals and Applications", Cambridge University Press, 2011. ISBN 978-0-521-88669-7.
B.D. Cullity, C.D. Graham, "Introduction to magnetic materials", Wiley, 2009. ISBN 978-0-471-47741-9
Alberto P. Guimaraes, "Principles of Nanomagnetism", Springer, 2009. ISBN 978-3-642-01481-9.
