MOLNÁR, T. Magnetooptické zobrazování a analýza mikrostruktur magnetické domény [online]. Brno: Vysoké učení technické v Brně. Fakulta strojního inženýrství. 2021.
The bachelor thesis by Tomáš Molnár deals with microscopy of magnetic domains using linear and quadratic magneto-optical effects. The theory behind electromagnetic waves and magneto-optics is precisely described in the first two chapters. In the experimental part, Mr. Molnár firstly employs imaging via linear magneto-optics to study magnetic domains in thin films and microstructures. He also developed a convenient Matlab-based software that automates image processing and provides quantitative magnetometry in a reliable way, with a performance comparable to commercial software. The additional part of the work on domain imaging via higher order magneto-optics is very valuable. The reported Voigt and gradient effect microscopy images are of remarkably high quality. In addition, interesting preliminary insights are given on the problem of antiferromagnetic domain imaging in metallic systems. The student was independent and persistent during the working process, despite having a severely limited access to laboratory time due to general sanitary restrictions. He showed a very good handling of the Kerr microscope and a natural ability for it after little initial guidance. While minor aspects of the manuscript and graphics could be improved, the text is clear and well written. All the thesis goals have been accomplished by far and I would like to give the highest mark “A”.
| Kritérium | Známka | Body | Slovní hodnocení |
|---|---|---|---|
| Splnění požadavků a cílů zadání | A | ||
| Postup a rozsah řešení, adekvátnost použitých metod | A | ||
| Vlastní přínos a originalita | A | ||
| Schopnost interpretovat dosažené výsledky a vyvozovat z nich závěry | A | ||
| Využitelnost výsledků v praxi nebo teorii | A | ||
| Logické uspořádání práce a formální náležitosti | A | ||
| Grafická, stylistická úprava a pravopis | B | ||
| Práce s literaturou včetně citací | A | ||
| Samostatnost studenta při zpracování tématu | A |
The bachelor thesis of Tomáš Molnár is dealing with magneto-optical imaging and analysis of the obtained data. In the first chapter author performed comprehensive literature research on the micromagnetic energies and various spin textures. The second chapter is devoted to the magneto-optical effects. In the following chapter, the author presents experimental results evaluated with self-developed code for vector magnetometry. The given procedure and code can be further used in the studies focused on micromagnetism. The self-developed code provides advanced options of filtering and processing; furthermore, it can be operated via a GUI, which enhances its versatility and feasibility. In the last chapter, the author investigates the second-order magneto-optical effects in ferromagnetic and antiferromagnetic materials. The presented thesis is thoroughly written, the achieved results are comparable to the commercial solution. The results achieved on the system of the FeRh are innovative and can be further used in the following research. All objectives of the bachelor thesis were accomplished, the thesis has good quality. Thus I recommend the work for defense with an overall grade of A.
| Kritérium | Známka | Body | Slovní hodnocení |
|---|---|---|---|
| Splnění požadavků a cílů zadání | A | ||
| Postup a rozsah řešení, adekvátnost použitých metod | A | ||
| Vlastní přínos a originalita | A | ||
| Schopnost interpretovat dosaž. výsledky a vyvozovat z nich závěry | B | ||
| Využitelnost výsledků v praxi nebo teorii | A | ||
| Logické uspořádání práce a formální náležitosti | A | ||
| Grafická, stylistická úprava a pravopis | A | ||
| Práce s literaturou včetně citací | A |
eVSKP id 132964