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Master's Dissertation
DOI
https://doi.org/10.11606/D.43.1989.tde-01072015-153458
Document
Author
Full name
Rudnei de Oliveira Ramos
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1989
Supervisor
Committee
Marques, Gil da Costa (President)
Marino, Eduardo Cantera
Rivelles, Victor de Oliveira
Title in Portuguese
Paredes de domínios em ferromagnetismo
Keywords in Portuguese
Fenomenologia
Ferromagnetismo
Teoria de campo
Abstract in Portuguese
Determinamos a tensão superficial de um defeito do tipo parede de domínio, utilizando a aproximação semiclássica no contexto da teoria de campos à temperatura finita para o modelo ? (?2)2 com interação invariante por simetria O(N), obtendo em seguida a temperatura crítica Tc de transição de fase e cálculo dos expoentes críticos ? e ?, aplicando então os resultados obtidos para a descrição de um modelo fenomenológico descrevendo o ferromagnetismo.
Title in English
Domain walls in ferromagnetism
Keywords in English
Ferromagnetism
Field theory
Phenomenology
Abstract in English
We determine the surface tension of a domain wall defect by using the semi classical approach in the context of field theory at finite temperature for the ? (?2)2 model with O(N) invariant interaction obtaining the critical temperature Tc of phase transition and the calculation of the critical exponents ? and ? applying then the obtained results to a description of a phenomenological model describing ferromagnetism.
 
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Ramos_1989.pdf (2.78 Mbytes)
Publishing Date
2015-07-02
 
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