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| Author(s): |
Caroline Lydie Mouls
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Instituto de Física Gleb Wataghin |
| Defense date: | 2017-10-21 |
| Examining board members: |
Júlio Criginski Cezar;
Cris Adriano;
Pascoal José Giglio Pagliuso;
João Paulo Sinnecker;
Ducinei Garcia
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| Advisor: | Eduardo Granado Monteiro da Silva; Júlio Criginski Cezar |
| Abstract | |
The results of this thesis can be separated in two main lines: i) growth and characterization of ferroelectric thin films; ii) magnetoelectric characterization of Fe thin films grew on BaTiO3 substrates. We succeed to fabricate simple thin films of orthorhombic YMnO3, BaTiO3 and SrRuO3 by RF-magnetron sputtering and by pulsed laser deposition. The films where characterized by several structural and spectroscopic techniques, showing that in some cases we obtained very high quality epitaxial films. Besides the results on thin film growth, we characterized the ferroelectric domains of a thin iron magnetic film grown on top of a ferroelectric BaTiO3 substrate. This kind of system behaves as a magnetoelectric multiferroic heterostructure. We studied the interaction between ferroelectric and ferromagnetic domains mostly by photoelectron emission microscopy (PEEM). This technique allows one to obtain microscopic information about the electric and magnetic domains in the sample. We were able to demonstrate the interaction between the magnetic and ferroelectric degrees of freedom in such heterostructures. We found that the underlying ferroelectric domains on BaTiO3 in some situations determine the orientation of the top Fe magnetic layer. These results show the potential of such artificial magnetoelectric heterostructure to control the magnetic state through the application of electrical voltages (AU) | |
| FAPESP's process: | 13/12423-3 - Study of ferroelectrique and multiferroic domain walls in thin films |
| Grantee: | Caroline Lydie Mouls |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |