Open Master Positions
Optical holography, materials science, and neutron optics
Supervisor: Martin Fally
Master projects in our group aim at designing and characterising diffractive optical elements for (very) cold neutrons. Experimental light optical holographic techniques applied to photosensitive complex media such as polymer nanocomposites are used to reach this goal. Current topics are at the interface of materials science, nonlinear light optics and neutron optics. Experiments are performed in local labs as well as at research centers in France (ILL, Grenoble) and Switzerland (PSI, Villigen). If your are interested in learning more, please contact martin.fally@univie.ac.at or juergen.klepp@univie.ac.at.
Theory and magnetic simulation of magnetic skyrmions
Supervisor: Dieter Suess
In the ever-evolving digital landscape, there is an escalating need for advanced data storage solutions capable of accommodating the exponential growth of data. Such innovative storage technologies are vital for pioneering developments in artificial intelligence, machine learning, and big data analytics, which all depend on extensive data storage capacities and robust processing capabilities.
This Master's thesis aims to contribute to this field by advancing micromagnetic simulations for a novel data storage concept based on magnetic skyrmions—tiny vortex-like configurations in the magnetic moments of materials. The project's focus is to explore and evaluate a dual-state system employing both skyrmions and their complementary quasi-particles, antiskyrmions, to represent binary information states.
Specifically, the research will be directed towards developing reliable methods for generating and manipulating these skyrmions and antiskyrmions. The goal is to establish dependable writing and reading processes that could lead to significant improvements in data storage density, access speeds, and energy efficiency.
Theory and magnetic simulation of magnonic devices
Supervisor: Dieter Suess
The master's thesis project, entitled 'Non-Reciprocal 3D Architectures for Magnonic Functionalities,' investigates novel non-reciprocal magnon phenomena in 2D and 3D hybrid nanostructures. This work is pivotal in advancing the development of non-reciprocal microwave devices and sensors. Components such as circulators, isolators, and phase shifters are critical in current communication systems and the quantum computers of the future. The thesis develops theories and micromagnetic simulations to estimate and optimize the power transmitted by spin waves.
Micromagnetic simulations coupled to molecular dynamic
Supervisor: Dieter Suess
Understanding the fundamental relationship between the shape and internal structure of magnetic colloidal particles and the magnetic, mechanical, and hydrodynamic forces acting upon them is crucial for optimizing magneto-controllable system applications, such as hyperthermia. However, to comprehend this complex interplay, a qualitatively new approach is necessary—one that considers both the intrinsic magnetization dynamics of the particles and their spatial rearrangements or self-assembly.
In the master's thesis project, molecular dynamic simulations of magnetic soft matter are self-consistently solved with the magnetisation dynamics within the particles.
Magnetic Memory Elements
Supervisor: Dieter Suess
In this project, we aim to enhance the fundamental understanding of Magnetic Random Access Memory (MRAM), a type of non-volatile memory that stores data by using magnetic storage elements. MRAM offers the potential for high-speed operation coupled with non-volatility, making it an attractive option for future memory technologies. Our objective is to optimize MRAM efficiency, defined as the ratio of thermal stability to the required write current. To achieve this, we will utilize existing software tools within our group, including energy barrier calculations with the string method and spintronic solvers. Our research will also focus on the comprehension and design of new, highly functional multilayers for improved MRAM performance
Numerical Micromagnetics
Supervisor: Claas Abert
Micromagnetic simulations form the backbone of many theoretical investigations when it comes to microscopic magnetic devices such as sensors and storage applications. The micromagnetic model is a continuous model that can be used to describe both static and dynamic magnetization processes by means of partial differential equations. Our group is developing various codes for the efficient solution of the micromagnetic equation with the finite-element and the finite-difference method. In order to allow for the simulation of larger systems and to reduce computation times, we have some very interesting master projects that focus on numerical algorithms. Candidates should have a background in programming and numerical algorithms.
Possible topics include the implementation of an FFT accelerated Strayfield algorithms for our finite-element code, the optimization of our finite-element code for parallel execution of the VSC computational cluster and the development of a combined finite-difference/finite-element method.
Magnetoelastic simulation of surface-acoustic wave devices
Supervisor: Claas Abert
Surface acoustic waves (SAW) generated by so-called interdigital transducers on piezoelectric thin-films have been extensively studied and found their way into numerous applications such as radio frequency filters and oscillators. In quite recent works, the interaction of SAWs to magnetoelastic materials were studied by placing a magnetic thin film on a piezoelectric material. This combination offers a lot of interesting technological opportunities e.g. by exploiting the non-reciprocal behaviour of certain magnetic systems. This master project aims to extend our micromagnetic simulation software to include magnetoelastic effects and use this code in order to explore new magnetic material systems subject to magnetoelastic excitations. Depending on the interests of the candidate this topic can be shifted either towards the modelling part (more programming) or towards the physics part (more simulation).
Micromagnetic simulation of novel spintronics devices
Supervisor: Claas Abert
Recently, our group was involved in the discovery of a new kind of spacer material for magnetic multilayers that allows for the noncolinear coupling of two ferromagnetic layers with a precise control on the coupling angle. In this master project, we aim to explore the possibilities to use this novel material in spintronics devices such as magnetoresistive random access memory (MRAM) cells, spin-torque oscillators (STOs) and sensors by means of micromagnetic simulations.
Polar domain walls in non-polar materials
Supervisor: Wilfried Schranz
Ferroelectric domain walls domain walls represent new and exciting objects in matter. In contrast to ferromagnetic systems, elastic interactions are of primary importance in ferroelectric materials, which makes a Landau-Ginzburg analysis rather cumbersome. Recently we have developed a new method by combining group theoretical layer group analysis with the symmetry properties of the order parameter. It turns out, that this method is very useful for characterizing the tensor properties of thick and thin domain walls, even for the case when in the domain wall new order parameters appear, which are not present in the bulk.
The present master projects aim to apply these group theoretical methods to selected crystals which are promising for the development of ferroelectric domain walls and calculate the corresponding equations of states, domain wall profiles, domain wall properties, etc. If you are interested, please contact wilfried.schranz@univie.ac.at.
Dynamic mechanical analysis of crystals, glasses and polymers
Supervisor: Wilfried Schranz/Viktor Soprunyuk
Our group has a long standing expertise in the study of dynamic elastic properties of materials in a broad temperature and frequency range. Materials range from ferroic crystals near structural phase transitions, to glasses and polymers. The present master project aims to investigate the dynamic elastic properties of a material, which will be selected depending on the interest of the applicant.
For more details, please contact wilfried.schranz@univie.ac.at or viktor.soprunyuk@univie.ac.at.