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Title Magnetic domains and walls at zero and non zero temperatures
Author Φραντζεσκάκης, Ραφαήλ
Thesis advisor Κομηνέας, Σταύρος
Abstract Nowadays, domain walls and generally magnetic domains play a vital role in the development of technology. Magnetic materials can be used in the information techonology for data storage. This study aims to understand magnetic domains and magnetic domain walls at zero and non zero temperatures. We examine static and dynamic domain walls in a ferromagnetic film with the Landau-Lifshitz-Gilbert equation in order to study the evolution of domain wall under magnetic field and a perpendicular anisotropy. Then, we observe steady states of domain wall with LLG under magnetic field and different anisotropies and we see the effect in domain wall velocity numerically and analytically. In addition, we study the magnetic moments under different temperatures with the Landau-Lifshitz-Bloch equation using a macrospin approach. We examine different phase diagrams of magnetization that are affected by different factors. Finally, we try to understand how magnetic moments work in hard drive disks introducing the Heat assisted magnetic recording.
Language English
Issue date 2019-07-26
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Physics--Graduate theses
  Type of Work--Graduate theses
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