Wahlpflichtvorlesung Grundlagen magnetischer Materialien (Magnetismus I), Basic introduction to magnetic materials (Magnetism I)

OPAL-Kurs

Olav Hellwig (E-Mail: olav.hellwig@…), Fabian Samad (E-Mail: fabian.samad@…) und Peter Heinig (E-Mail: peter.heinig@…)

Content of the Magnetism I module (Basic introduction to magnetic materials):

The focus of this elective module is the magnetism of (ferro) magnetic materials, its origin and the phenomena resulting from it. The lectures will cover the following topics:

• introduction to and history of magnetic materials

• electro-magnetism with a focus on magneto-statics and magnetic materials

• quantum mechanical foundations of magnetic materials

• from magnetic moments in atoms and ions to the magnetism in solid state physics

• spontaneous magnetization of magnetic materials (ferromagnetism)

• mico-magnetic energies of ferromagnetic materials: demagnetization, exchange and anisotropy

• magnetic field reversal and domain formation

Organizational:

In the SS 2025 we offer the Magnetism I lecture (“Basic introduction to magnetic materials”) as well as the corresponding Magnetism I exercise class in a hybrid (in person/online mixed) format.

We will provide weekly lecture recordings, each about 90 minutes in average length. Access to these recordings will occur via our Magnetism I webpage. You should listen to the weekly lecture recordings at your own convenience until the next weekly live feedback session at our designated “Magnetism I” lecture time slot, currently scheduled for Thursdays at 13:45 in room 2/W020 (C25.020). During these in presence feedback sessions we will do a short quiz about the main topics of the previous recorded lecture and you will have the opportunity to ask questions about the lecture content. We can then go to the corresponding slides of the lecture and discuss your questions in detail and hopefully resolve any issues.

The dates and times for the exam will be organized via the OPAL course. If you encounter any problems with the exam registration or want to change the exam date, please contact Peter Heinig ( peter.heinig@…).

Important Notice:

Often it is not possible to avoid time slot conflicts completely for every possible timetable constellation, in particular since this class is offered to Physics, AFM and SeKo students in parallel.

For the case you are interested to attend this lecture/exercise class and obtain credit for it, but you have a conflict in your lecture schedule with the current time slot and thus are not able to attend the first session on 10.4. at 13:45, then please contact Peter Heinig prior to the session via Email ( peter.heinig@…) and let him know. Often it is possible to adjust the time slot of the lecture/exercise class in the first couple of lecture weeks (when we know who is interested in attending the lecture) to avoid an overlap with other lectures. So please let me know if this is the case for you and we will try to adjust the lecture/exercise class time slot correspondingly.

Lecture of 10.04.2025 (Organization+motivation, history of magnetism)

Lecture of 17.04.2025 (Magnetism in a nutshell)

Lecture of 08.05.2025 (Magnetostatics)

Lecture of 08.05.2025 (Magnetostatics with materials)

Lecture of 22.05.2025 (Elements of quantum mechanics)

Lecture of 22.05.2025 (Spin-orbit coupling, Lande factor etc)

Lecture of 12.06.2025 (Localized and delocalized electrons)

Lecture of 12.06.2025 (Multi electron systems)

Lecture of 26.06.2025 (Band magnetism, Stoner criterion)

Lecture of 26.06.2025 (Excursion on Orbitals, Crystal fields)

Lecture of 26.06.2025 (Remaining parts on crystal fields)

Lecture of 10.07.2025 (Magnetic energies)

Lecture of 10.07.2025 (Magnetic energy competition and length scales)

Lecture of 10.07.2025 (Magnetic field reversal)