de | en

Matthias Althammer

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

Courses and Dates

Offered Bachelor’s or Master’s Theses Topics

Oxidische Heterostrukturen für Experimente mit reinen Spinströmen

Pure spin currents are generated and/or detected via the spin Hall and inverse spin Hall effect in heavy metals. These two effects crucially depend on the magnitude of the spin-orbit interaction. The goal of this thesis is to investigate the spin Hall physics in oxide systems, where large spin orbit interaction is prevailing like in the transition metal oxides. In particular, the realization of epitaxial multilayers of a spin Hall active material and a magnetically ordered insulator are a major task of this research project. Such all-oxide epitaxial structures are of current interest to better understand the underlying physics of pure spin current transport in heterostructures.

We are looking for an enthusiastic master student to work on this pure spin current physics related project. A crucial part of the thesis is the growth of oxide multilayers using laser-MBE under in-situ growth monitoring. The properties of these multilayers will then be investigated by structural, magnetic and magnetotransport techniques. As a next step, the tunability of relevant spin transport properties via the growth conditions will be analyzed

suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
  • Master’s Thesis Quantum Science & Technology
Supervisor: Rudolf Gross
Spintransport in Supraleiter/Ferromagnet-Heterostrukturen

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 use broadband ferromagnetic resonance and magnetoresistance effects to inject a spin current into the superconductor. This requires investigations at low temperatures around the critical temperature of the superconductor in large magnetic fields. For the superconductor/ferromagnet magnetoresistance effects, the magnetic field orientation dependence and its influence on the Andreev reflection contribution is the focus of this study.

We are looking for a talented master student to investigate spin transport in superconductor/ferromagnet heterostructures. The thesis deals with the fabrication of these heterostructures using our new UHV sputtering system and structuring of the blanket films with optical and electron beam lithography. In addition, characterization of theses heterostructures at low temperatures will be conducted in superconducting magnet cryostats. Here, high frequency spin dynamics as well magnetotransport studies will be conducted

suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
  • Master’s Thesis Quantum Science & Technology
Supervisor: Rudolf Gross
Steuerung des Magnonentransports

Magnon transport in magnetic insulators has similarities and differences compared to the familiar transport properties of their charge counterparts. For example, diffusive transport is a shared feature, while the obvious difference is that charges are a conserved quantity and magnons are excitations decaying with a characteristic lifetime. The aim of this thesis is to obtain a better understanding how to control the magnon transport in magnetic insulators (e.g. yttrium iron garnet). In particular, we plan to focus on heat driven magnon transport properties as well as the control of the magnon conductance by electrical means. Interesting transport observables in this context will be magnon resistivity as well as the investigation of magnon correlation length.

We are looking for a master student interested in 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
  • Master’s Thesis Applied and Engineering Physics
  • Master’s Thesis Quantum Science & Technology
Supervisor: Rudolf Gross
Topologische magnetische Phasen in Dünnschicht-Heterostrukturen

The broken inversion symmetry at the interface of thin film ferromagnets and normal metals with strong spin-orbit coupling can give rise to chiral magnetic order. These chiral magnetic materials show exotic magnetic properties such as a skyrmion lattice phase and have strong application potential for future spintronic devices. For these applications, a detailed understanding of the magnetization dynamics in these materials is required. The goal of this master thesis is to fabricate such thin film multilayer structures using sputter deposition techniques and analyze their dynamic magnetic properties using broadband ferromagnetic resonance spectroscopy.

We are looking for a highly motivated master student to carry out these experiments on interfacial effects in metallic multilayers. In this thesis you will work on the fabrication of these multilayer structures using UHV sputter deposition systems and subsequently determine their magnetic properties using broadband ferromagnetic resonance spectroscopy and SQUID magnetometry

suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
  • Master’s Thesis Quantum Science & Technology
Supervisor: Rudolf Gross
Top of page