Front propagation in a phase field model with phase-dependent heat absorption
Blyuss, Konstantin; Ashwin, Peter; Wright, C. David; et al.Bassom, Andrew P.
Date: 20 March 2006
Journal
Physica D
Publisher
Elsevier
Publisher DOI
Abstract
We present a model for the spatio-temporal behaviour of films exposed to radiative
heating, where the film can change reversibly between amorphous (glassy) and
crystalline states. Such phase change materials are used extensively in read-write
optical disk technology.
In cases where the heat absorption of the crystal phase is less ...
We present a model for the spatio-temporal behaviour of films exposed to radiative
heating, where the film can change reversibly between amorphous (glassy) and
crystalline states. Such phase change materials are used extensively in read-write
optical disk technology.
In cases where the heat absorption of the crystal phase is less than that in the
amorphous state we find that there is a bi-stability of the phases. We investigate
the spatial behaviours that are a consequence of this property and use a phase field
model for the spatio-temporal dynamics in which the phase variable is coupled to a
suitable temperature field. It is shown that travelling wave solutions of the system
are possible and, depending on the precise system parameters, these waves can take
a range of forms and velocities. Some examples of possible dynamical behaviours
are discussed and we show, in particular, that the waves may collide and annihilate.
The longitudinal and transverse stability of the travelling waves are examined using
an Evans function method which suggests that the fronts are stable structures.
Mathematics and Statistics
Faculty of Environment, Science and Economy
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