Modelo de Preisach e análise FORC aplicados a filmes com exchange-bias / Preisach model and Forc analysis applied to exchang biased films

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

In this work, thin films of Si[100]/buffer/NiFe/FeMn/Ta (buffer = Cu; Ta) and spin valves of Si[100]/Cu/NiFe/Cu/NiFe/FeMn/Ta were produced via sputtering and their magnetic behavior were studied by First Order Reversal Curves (FORCs) analysis. A Preisach Model with Exchange-Bias was developed and applied in order to simulate the hysteresis and the first order reversal curves of the NiFe/FeMn bilayers. In addition, the model allowed to reproduce the asymmetric behaviors present in both branches of the hysteresis curve in these films. The study put in evidence the mean field effects on de Py layer as a function of the thickness of the FeMn layer. The application of the FORC analysis in the spin valves was interesting to study the degree of coupling between the free and the pressed layers, as well as the effect of mean field in each layer.

ASSUNTO(S)

exchanged bias coercivity filmes finos antiferromagnetism ferromagnetismo preisach thin films antiferromagnetismo magnetismo spin magnetism hysteresis forc ferromagnetism spin

ACESSO AO ARTIGO

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