Bachelor und Master Arbeiten:
Doktorand/innen und Postdoc Stellen:
BA/MA Thesis offer: Fractal Quantum Cavitronics
(contact B. Zingsem, M. Farle)
Electronic devices' demand has been increasing exponentially over the past 50 years, with computer technology developing alongside to meet these requirements. Naturally, an exponential increase in power demand for computer technologies is also Observed. Over the next ten years, it is expected to increase by a factor of six and continue to grow . In electronic devices, however, this energy is mainly converted into heat. An alternative approach to conventional electronics is using fundamental spin oscillations – called magnons – as carriers of information. Exciting a magnon requires about 300.000 times less energy than an electric current. Additionally, magnons are bosonic particles and enable joule-heat-free transport of information. Hence the power demand and efficiency of computation technologies can be vastly improved by using magnons instead of electric currents.
This thesis project will focus on measuring magnonic oscillations using newly developed fractal cavities.
Theoretical understanding and experimental skills will be built during the thesis. The student will acquire fundamental knowledge of magnetism, solid-state physics, magnetic resonance, microwave technology, vector-network-analyzer, lithography, cryogenics, and resonant cavities.
Required knowledge: The physics of a pendulum
BA/MA Thesis offer: Detection of Inertia effects (nutation) in spin dynamics
(contact Dr. A. Semisalova)
Inertia effects lead to a wobbling of the axis of the earth -in other words nutation . Similar Inertia effects have been predicted and recently observed in spin dynamics [1,2] . In this thesis you have the chance to contribute to the experimental investigations to observe this effect by microwave spectroscopy /THz spectroscopy in magnetic nanoscale structures.
 Neeraj, K., N. Awari, et al, Inertial spin dynamics in ferromagnets. Nature Physics 17(2) (2021) 245.
 Cherkasskii,, M, et al. , Nutation resonance in ferromagnets. Physical Review B 102(18) (2020) 184432.
BA/MA Thesis offer: Magnetization dynamics in laterally patterned magnetic landscapes
(contact Dr. A. Semisalova)
Objective: Spin Pumping effects in laterally structured ferro- / paramagnetic lateral architectures
Spin pumping or transfer of angular momentum transfer from ferromagnetic into dia/paramagnetic films has been a “hot” topic in modern spintronics for the last couple of years. In this thesis you will participate in the investigation of novel structures by means of microwave spectroscopy, magnetometry and atomic/magnetic force microscopy.
Collaboration with HZDR (Dresden), IMMM (Le Mans, France)
BA/MA Thesis offer: Magnetism and Spin Dynamics in 2D materials
(contact Dr. A. Semisalova, Dr. H. Pazniak, Dr. U. Wiedwald)
Novel room temperature 2D materials have been theoretically predicted, and first experimental evidence for their existence has been obtained. In this thesis you will investigate 2D materials - so called “MXene materials” with microwave spectroscopy, magnetometry, and atomic/magnetic force microscopy.
Pazniak, H., et al,. ACS Nano (2021).
In an alternative approach 2D films will be grown and characterized in UHV.
Bhagat, B., et al AIP Advances 10(7) (2020) 075219.
Contact: Dr. Anna Semisalova, Dr. Hanna Pazniak, Dr. Ulf Wiedwald