Inspirace z nebes: Krystalový růst frustrovaného magnetu FeAl12O19 identifikovaného jako meteorit
| Název práce v češtině: | Inspirace z nebes: Krystalový růst frustrovaného magnetu FeAl12O19 identifikovaného jako meteorit |
|---|---|
| Název v anglickém jazyce: | Inspiration from the Heavens: Crystal Growth of Meteorite-identified frustrated magnet FeAl12O19 |
| Klíčová slova: | magnetism|ferroelectricity|synthesis|crystal growth |
| Akademický rok vypsání: | 2024/2025 |
| Typ práce: | bakalářská práce |
| Jazyk práce: | |
| Ústav: | Katedra fyziky kondenzovaných látek (32-KFKL) |
| Vedoucí / školitel: | Gaël Bastien, Ph.D. |
| Řešitel: |
| Zásady pro vypracování |
| The work will consist of synthesis attempts of FeAl12O19 first as a powder by solid state synthesis, then as a single crystal by the floating zone technique [3]. Either using optical heating through focusing of IR light using parabolic mirrors, or by laser heating. The single crystal growth involves several preparative steps to first pre-synthesise polycrystalline material through solid-state reactions of the oxides; prepare precursor rods through cold pressing; sinter the precursor rods to increase density whilst also increasing structural strength; and finally shape them for mounting within the floating zone furnace.
After the growth, the crystals will be characterized by x-ray diffraction and composition analysis to confirm crystal quality. Then the magnetic properties will be characterized by magnetization and/or specific heat measurements. |
| Seznam odborné literatury |
| [1] Ma, C. H. I. Am. Mineral. 2010, 95, 188.
[2] S.-P. Shen, et al., Nature Communications 2016 , 7. [3] Alemayehu S. Admasu and Durga Sankar Vavilapa, https://arxiv.org/abs/2103.05587. |
| Předběžná náplň práce v anglickém jazyce |
| Frustrated magnets are magnetic materials where all the magnetic interactions cannot be simultaneously satisfied and thus compete with each other. In these materials a large variety of magnetically ordered states and disorder states are possible, often with very small energy differences between them. Interacting electric dipolar moments may also lead to similar frustration in compounds with the magnetoplumbite crystal structure [2] and our recent work has revealed this phenomena in the compound EuAl12O19. The new compound FeAl12O19 is expected to combine both a frustrated lattice of electric dipoles and a frustrated lattice of magnetic dipoles and we expect both problems to be related via a magnetoelectric coupling offering us the possible realization of exotic magnetoelectric phases. |