Static and dynamic magnetoelectric coupling in multiferroics
| Thesis title in Czech: | Statická a dynamická magnetoelektrická vazba v multiferoikách |
|---|---|
| Thesis title in English: | Static and dynamic magnetoelectric coupling in multiferroics |
| Key words: | multiferoika|feroelektrika|měkké módy|elektromagnony|perovskity |
| English key words: | Multiferroics|Ferroelectrics|Soft-modes|Electromagnons|Perovskites |
| Academic year of topic announcement: | 2019/2020 |
| Thesis type: | dissertation |
| Thesis language: | angličtina |
| Department: | Fyzikální ústav AV ČR, v.v.i. (32-FZUAV) |
| Supervisor: | RNDr. Stanislav Kamba, CSc. |
| Author: | hidden - assigned and confirmed by the Study Dept. |
| Date of registration: | 20.09.2019 |
| Date of assignment: | 20.09.2019 |
| Confirmed by Study dept. on: | 02.10.2019 |
| Date and time of defence: | 14.10.2024 10:00 |
| Date of electronic submission: | 14.08.2024 |
| Date of submission of printed version: | 14.08.2024 |
| Date of proceeded defence: | 14.10.2024 |
| Opponents: | Oleg Heczko, Dr. |
| prof. RNDr. Vladimír Sechovský, DrSc. | |
| Guidelines |
| Magnetoelectric coupling in multiferroics is currently a hot topic in solid state physics, not only due to its rich physics but also because of future potential applications in nonvolatile electronic memories, electric field controlled spin filters, magnetoelectric sensors, and so on.
The goal of this thesis will not only be the study of static magnetoelectric coupling (i.e., change of static magnetization by electric field) in various multiferroics, but also the dynamic magnetoelectric coupling responsible for the activation of magnons in terahertz dielectric spectra. Such magnetoelectric excitations are called electromagnons and can, in general, be activated by different mechanisms other than static magnetoelectric coupling. Electromagnons will be investigated using terahertz, infrared and Raman spectroscopy down to liquid helium temperatures and, in some cases, also under external magnetic and electric fields. We aim to study dynamical multiferroicity as well, where electromagnons and phonons are excited by highly intensive THz radiation using free-electron lasers at the large scale facilities like TELBE and FELBE in Dresden and TerraFERMI in Trieste. Static magnetoelectric coupling will be measured using the PPMS instruments in the joint lab of FZU and MFF UK. |
| References |
| C. Kittel: Introduction to Solid State Theory
P. Bruessch: Phonons I-III, Springer Series in Solid State Science M. + G. Dresselhaus, A. Jorio: Group Theory - Application to Physics of Solid State, Springer 2008 G. Burns, M. Glase: Space Groups for Solid State Scientists, Elsevier 2013 |