Banca de QUALIFICAÇÃO: THAISA GRASIELLY DE MORAIS JALES

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : THAISA GRASIELLY DE MORAIS JALES
DATA : 14/03/2023
HORA: 16:00
LOCAL: Sala virtual
TÍTULO:

Magnetic susceptibility of nanostructured systems

PALAVRAS-CHAVES:

nanstructured magnetic systems; magnetic susceptibility; dipole interaction; magnetic vortices

PÁGINAS: 50
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
SUBÁREA: Física da Matéria Condensada
ESPECIALIDADE: Materiais Magnéticos e Propriedades Magnéticas
RESUMO:

With the emergence of nanotechnology, the growth and characterization of structures on a nanometric scale became possible. Scientific investigation of magnetic nanostructures between 10 and 1000 nm has shown that their characteristics can be completely different from those on a macroscopic scale. Due to this wealth of properties and their technological potential, nanostructured magnetic systems arouse the interest of both academia and industry. Therefore, our work aims to study elliptical-faced ferromagnetic nanocylinders' magnetic phases and dynamic susceptibility. Preliminary results show that under equilibrium conditions, depending on geometric parameters or external factors such as an applied field, elliptical-faced ferromagnetic nanocylinders can exhibit a uniform state, one vortex, or two magnetic vortices. From the point of view of dynamic magnetic susceptibility, we aim to study the microwave spectrum in systems that exhibit spatial variation of magnetization. Experimental results show that magnetic vortices' interaction can amplify radiation's emitted power, which is crucial for possible future applications in nanotechnology. In this context, we will compare the dynamic susceptibility in systems with one and two vortices. To this end, a theoretical model was developed to analyze excitation spectra in ferromagnetic systems structured at the nanometric level. The model was built through micromagnetic simulations, using the dynamic susceptibility tensor method to analyze magnetic-metal microwave emission. This approach complements the Landau-Lifshitz dynamic equation, which was used to obtain the equations of motion.

MEMBROS DA BANCA:
Externo ao Programa - 12216 - LEONARDO LINHARES OLIVEIRA
Externo à Instituição - GUSTAVO DE OLIVEIRA GURGEL REBOUÇAS - UFERSA
Externa à Instituição - RAFAELA MEDEIROS DE SOUZA - FURG