Diagramas de Fases de um Modelo de Filmes Finos com Interação de Ising

  • Data: 24/03/14 às 11:00h
  • Local: Sl A5-01
  • Apresentador: Daniel Mallio

Resumo: Sistemas de multicamadas constituídos por camadas magnéticas de heteroestruturas podem possuir uma variedade de fases magnéticas - essas dependentes de fatores como os parâmetros de troca, a geometria do material, a temperatura T à qual ele é submetido e o campo B nele aplicado. Vamos considerar um modelo de Filme Fino no qual as varias camadas que o compõem são formadas por K planos de Ising que possuem a mesma constante de acoplamento e que possua entre os planos K/2 e K/2+1 um acoplamento antiferromagnético cuja interpretação Física seriam defeitos e/ou impurezas no material. O cálculo das respostas magnéticas do modelo permite-nos obter as temperaturas e os respectivos campos críticos relativos às transições de fase de 1ª e 2ª ordens viabilizando a construção dos diagramas de fases do sistema e a estimação do ponto tricrítico. Obtivemos também a campo nulo os expoentes críticos relativos às respostas magnéticas do material a fim de verificar a Relação de Rushbrooke. Fizemos também uma análise acerca dos ciclos de histereses do material. Os métodos de Monte Carlo utilizados nos cálculos são os Algoritmos de Amostragem Entrópica cuja idéia principal é explorar o principio da máxima entropia - Entropic Sampling - e o algoritmo de Amostragem Relevante usual, introduzido por Metropolis et al.

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