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Dr. Matthias Althammer

Phone
+49 89 289-14311
Room
E-Mail
matthias.althammer@mytum.de
Links
Homepage
Page in TUMonline
Groups
Technical Physics
TUM Department of Physics
Additional Info
Post-Doc in the Magnetism and Spinelectronics group

Courses and Dates

Offered Bachelor’s or Master’s Theses Topics

Controlling magnon transport in antiferromagnetic insulators
In antiferromagnetic insulators, we obtain two magnon modes with opposite spin chirality due to the two opposing magnetic sublattices. In this way, magnon transport in antiferromagnetic insulators can be considered as the magnonic equivalent of spin transport via electrons. The aim of this thesis is to obtain a better understanding of the magnon transport in antiferromagnetic insulators and investigate external control parameters that allow a manipulation of the spin information transport in the antiferromagnetic insulator. Moreover, these experiments allow to extract important transport properties like for example the magnon spin life-time. We are looking for resourceful master student heavily interested in these magnon transport experiments. In order to answer questions regarding magnon transport in magnetic insulators, your thesis will contain aspects of the fabrication of nano-scale devices using electron beam lithography as well as ultra-sensitive low-noise electronic measurements in a cryogenic environment.
suitable as
  • Master’s Thesis Condensed Matter Physics
Supervisor: Rudolf Gross
Superconducting devices based on superconductor/ferromagnet heterostructures
The combination of ferromagnetic and superconducting materials leads to intriguing proximity effects at the interface of the two materials. The goal of this thesis is to investigate the spin transport of superconductor/ferromagnet interfaces and model the obtained results in the framework of proximity effects. To this end, we will fabricate superconducting devices based on superconductor/ferromagent heterostructures with a special focus on controlling magnetization dynamics via superconducting charge currents. This requires investigations at low temperatures around the critical temperature of the superconductor in large magnetic fields. In addition microwave magnetic fields will be employed to drive magnetization dynamics in the ferromagnet and excitations in the superconductor. We are looking for a talented master student to investigate spin transport in superconductor/ferromagnet heterostructures. You will fabricate superconductor/ferromagnet heterostructures using our new UHV sputtering system. As a next step, you will structure these blanket films with optical and electron beam lithography into superconducting devices. Finally, you will characterize your fabricated samples at low temperatures utilizing superconducting magnet cryostats. Here, high frequency spin dynamics as well magnetotransport studies are the focus of your thesis.
suitable as
  • Master’s Thesis Condensed Matter Physics
Supervisor: Rudolf Gross
Superconducting spintronics with magnetic insulators

Combining the fields of superconductivity and spintronics can lead to novel functionalities, which mainly arise at the interface of a superconductor and a magnetic material. For example, proximity to a magnetic insulator induces superconductivity with Cooper pair spin triplets. You will be advancing this field by preparing thin film heterostructures of superconductors and magnetic insulators. In addition, within your thesis you will investigate the magnetotransport properties of these heterostructures at low temperatures.

You will work with state-of-the-art thin film deposition machines to carry out this task. Moreover, you will utilize nanolithography for structuring your samples. Furthermore, you will utilize low temperature setups and low noise measurement techniques to gain insight into the interface effects arising at the superconductor/magnetic material interface. 

suitable as
  • Bachelor’s Thesis Physics
Supervisor: Rudolf Gross
Tailoring magnon transport in magnetic insulators
By reducing the dimension of materials we can enter into the world of novel quantum classes of materials. Especially, in the limit of 1-dimensional transport, fascinating phenomena like the quantization of transport properties are observed. With your Bachelor thesis you will advance our magnon transport experiments in thin film magnetic insulators by further reducing the lateral dimensions of the magnon transport channel. Utilizing scanning probe microscopy, you will analyze the surface topography of the structured devices, magnetic properties and optimize the fabrication processes. You will utilize sophisticated nano-lithography in combination with state-of-the-art thin film deposition techniques to constrain the magnon transport channel in magnetic insulators. In addition, you will gain insight into scanning probe microscopy, one of the frontrunners for surface spectroscopy analysis.
suitable as
  • Bachelor’s Thesis Physics
Supervisor: Hans-Gregor Hübl
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