  In this article, a few problems related to multiscale modelling of magnetic
materials at finite temperatures and possible ways of solving these problems
are discussed. The discussion is mainly centred around two established
multiscale concepts: the partitioned domain and the upscaling-based
methodologies. The major challenge for both multiscale methods is to capture
the correct value of magnetisation length accurately, which is affected by a
random temperature-dependent force. Moreover, general limitations of these
multiscale techniques in application to spin systems are discussed.
