  We investigated coercive fields of 200nm x 1200nm x 5nm rectangular
nanocrystalline thin films as a function of grain size D using finite elements
simulations. To this end, we created granular finite element models with grain
sizes ranging from 5nm to 60nm, and performed micromagnetic hysteresis
calculations along the y-axis (easy direction) as well as along the x-axis
(hard direction). We then used an extended Random Anisotropy model to interpret
the results and to illustrate the interplay of random anisotropy and shape
induced anisotropy, which is coherent on a much larger scale, in thin films.
