Banca de DEFESA: ANDERSON ALVES GURGEL

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : ANDERSON ALVES GURGEL
DATA : 15/12/2022
HORA: 09:30
LOCAL: Auditório do PRODEP-FANAT
TÍTULO:

Studies of Magnetic Phases in Terbium Thin Films through Thermal Hysteresis Measurements.

PALAVRAS-CHAVES:

Rare earth, Thermal hysteresis, Terbium thin films.

PÁGINAS: 85
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 study of thin films and magnetic multilayers
has been important from an academic perspective, revealing great potential for technological applications. In this work, we present a theoretical investigation of the effects of magnetic field, temperature, and size on the magnetic phases in thin films of the rare earth Terbium (Tb).

The theoretical method used to obtain the magnetic phases of Tb films takes into account the contributions of exchange energy, anisotropy energy, Zeeman energy, and thermal energy, which are calculated using an auto-consistent field model.

The self-consistent effective field model uses the constants
associated with the energies involved and their dependence
on temperature, and this dependences are obtained from experimental works.

Our study revealed that, in addition to the previously observed
magnétic phases to Tb in bulk, the Tb films produce a variety of different magnética phases due to competition between the envolved energies (Exchange, Anisotropie, Zeeman, and Thermal) and the
effects of size and surface, produce a variety of different magnetic phases.

MEMBROS DA BANCA:
Presidente - 1881 - VAMBERTO DIAS DE MELLO
Interno - 050.025.724-80 - RODOLFO BEZERRA DA SILVA - UERN
Externo à Instituição - FRANCISCO CESAR DE MEDEIROS FILHO