Banca de DEFESA: WILLIANE SILVA SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : WILLIANE SILVA SANTOS
DATA : 29/02/2024
HORA: 19:00
LOCAL: Uso de vídeo conferência por meio da plataforma Googgle Meet
TÍTULO:

Effect of Dipolar Interaction on Ferromagnetic Nanorings

PALAVRAS-CHAVES:

Nanostructures, Nanorings, Dipolar Field, Magnetic Phases and Vortex

PÁGINAS: 71
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
SUBÁREA: Física da Matéria Condensada
ESPECIALIDADE: Materiais Magnéticos e Propriedades Magnéticas
RESUMO:

In recent years, the ability to design nanostructures and control magnetic properties on a nanometric scale has attracted a lot of attention from researchers, with emphasis on different geometries, such as cubic, rectangular, cylindrical, rings, etc., being studied extensively with the possibility of applications in technologiesdata recording, biomedicine and sensors.From a theoretical point of view, there is interest in the analysis of new magnetic phases, originating from the dipolar field, in nanostructures with dimensions on the order of tens of the exchange length, for applications in magnetic recording systems.In this work, initially a theoretical study was carried out on the impact of dipolar interaction on the magnetic phases of nanocylinders and later on nanorings.Our studies indicated that the effect of dipolar interaction in nanorings is capable of causing significant changes in the magnetic phases in isolated nanostructures.It was shown that through the chosen parameters we can control the vortex nucleation region.There is a difference in the nanostructures detailed in this work, because for nanorings the exchange energy term that was associated with the nucleus is non-existent and for nanocylinders this term is not absent, which favors studying the behavior of magnetic states in nanorings, as it was verifiedthe emergence of multidomain phases contributing to the formation of domain walls.The research was developed through the analysis of the magnetization curves of the remanence phases.An external magnetic field of 5 kOe was applied in different directions until saturating the structure and we gradually removed this field until remanence was reached.

MEMBROS DA BANCA:
Presidente - 635.107.314-68 - IDALMIR DE SOUZA QUEIROZ JÚNIOR - UFERSA
Interno - 1881 - VAMBERTO DIAS DE MELLO
Externo à Instituição - FRANCISCO CESAR DE MEDEIROS FILHO - UFERSA