Banca de DEFESA: LESSANDRO JORGE DE LIMA
Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.STUDENT : LESSANDRO JORGE DE LIMA
DATE: 25/02/2021
TIME: 09:00
LOCAL: Plataforma Google Meet
TITLE:
Computational Models for Thermoelectric Effects Studies in Thin Films and the Medium Range Potts Model (q = 3)
KEY WORDS:
Thermoelectric Effect, Co 2 FeAl/W, Seebeck Spin Effect, Potts Model, Scale Theory, Monte Carlo Simulation.
PAGES: 96
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:
In this thesis we present the results of two works in computational physics on the thermoelectric effects in thin films and the medium-range Potts model (q = 3). In the first, we seek to obtain the magnetic behavior and thermoelectric response of Co2FeAl/W films from numerical calculations, we compare experiment and theory, we explore the possibility of obtaining evolution of the magnetic response and the thermoelectric voltage with the magnitude and direction of the magnetic field. We show that the thermoelectric voltage curves can be obtained from a change in the Stoner-Wohlfarth model by the association and experimental parameters used in the longitudinal spin Seebeck effect experiment. In the second, we seek to find the so-called X and Y exponents, for the medium-range Potts model, which describes the transition from one universality class to another as the range of interactions increases. Such an effect is called a crossover phenomenon. We present the results obtained so far for the medium-range Potts model. We use the Metropolis algorithm to perform numerical Monte Carlo simulations of the Potts model of the state q = 3. With this algorithm we simulate systems with network sizes, L, equal to 32, 46, 64, 92, 128, 182 and 256. We found that as the range of interactions, Rm increases, the critical exponents α/ν, β/ν and γ/ν vary. Therefore, in this work we try to use two algorithms in two applications involving thin films and the Potts model (q = 3).
BANKING MEMBERS:
Interno - 1508681 - FELIPE BOHN
Presidente - 2492756 - JOAO MEDEIROS DE ARAUJO
Externo à Instituição - LÚCIO STRAZZABOSCO DORNELES - UFSM
Interno - 1294916 - MADRAS VISWANATHAN GANDHI MOHAN
Interno - 1474380 - MARCIO ASSOLIN CORREA
Externo à Instituição - SERGIO ANDRÉ FONTES AZEVEDO - UFPB