  The Cosserat model generalises an elastic material taking into account the
possible microstructure of the elements of the material continuum. In
particular, within the Cosserat model the structured material point is rigid
and can only experience microrotation, which is also known as micropolar
elasticity. We present the geometrically nonlinear theory taking into account
all possible interaction terms between the elastic and microelastic structure.
This is achieved by considering the irreducible pieces of the deformation
gradient and of the dislocation curvature tensor. In addition we also consider
the so-called Cosserat coupling term. In this setting we seek soliton type
solutions assuming small elastic displacements, however, we allow the material
points to experience full rotations which are not assumed to be small. By
choosing a particular ansatz we are able to reduce the system of equations to a
Sine-Gordon type equation which is known to have soliton solutions.
