IFIMAR   20926
INSTITUTO DE INVESTIGACIONES FISICAS DE MAR DEL PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Ferromagnetic thin film model: Barkhausen avalanches and scaling anomalies
Autor/es:
M. F. TORRES; R. C. BUCETA
Lugar:
ViƱa del Mar
Reunión:
Workshop; 14th Workshop on Instabilities and non-linear structures; 2013
Institución organizadora:
Universidad de Chile - CONICyT - otros
Resumen:
In this poster we show our recent results [Eur. Phys. B 80, 1 (2013)] on Barkhausen avalanches and anomalous scaling in a model of ferromagnetic thin film. It recently increased interest in theoretical and experimental study of the statistical properties of the magnetic domain wall (MDW) in ferromagnetic thin films placed in an external magnetic field. Here we consider the (1+1)-D model introduced by Buceta and Muraca [Physica A 390, 4192 (2011)] based on rules of evolution to describe avalanches of MDW. We show that this model is in the universality class of materials where the exchange interactions (or short range) are much more important than the dipolar (or long-range). The exponents of the distributions of avalanche-size τ and -duration α match those obtained by other theoretical models and experiments (available only for the size distributions). From the values obtained for the roughness exponents ζ (global), ζloc (local) and ζs (spectral), obtained from the global roughness function, the correlation (or local roughness) and structure function, respectively, it was found in recent studies that the universality classes should be analyzed in the context of the anomalous scaling theory. We show that the model present intrinsic anomalous scaling (ζ=1.5, ζloc = ζs =0.5). With these results, we hope to soon establish scaling relations that verify the critical exponents of the model, including the dynamic exponent z, the roughness exponents, and the avalanche distribution exponents, among others.
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