INVESTIGADORES
DE VIRGILIIS Andres
artículos
Título:
Study of the dynamic growth of wetting layers in the confined Ising model with competing surface fields
Autor/es:
E. V. ALBANO; A. DE VIRGILIIS; M. MUELLER; K. BINDER
Revista:
JOURNAL OF PHYSICS CONDENSED MATTER
Referencias:
Lugar: Londres (Reino Unido); Año: 2006 vol. 18 p. 2761 - 2775
ISSN:
0953-8984
Resumen:
A two-dimensional magnetic Ising system confined in an
L × D
geometry () in the presence of competing magnetic fields
(h) acting at opposite
walls along the D-direction exhibits an interface between domains of different orientation that
runs parallel to the walls. In the limit of infinite film thickness () this interface undergoes a wetting transition that occurs at the critical curve
Tw(h), so
that for T<Tw(h)
such an interface is bound to the walls, while for
Tw(h)≤T≤Tcb
the interface is freely fluctuating around the centre of the film, where
Tcb
is the bulk critical temperature. Starting from a monodomain structure with the interface
bound to one wall, we study the onset of the interface unbinding by considering both
short- and long-range magnetic fields acting at the walls. It is shown that, within the critical
wetting regime, in both cases the correlation length of interfacial fluctuations grows with time t
as with z = 2, while the interfacial position follows both in the case of short-range and long-range surface fields, respectively, consistent with
dynamic scaling predictions. Furthermore, considering the complete wetting regime and in
the presence of a bulk magnetic field, we find that the interface location also obeys
standard dynamic scaling behaviour for both short-range and long-range fields.