Voronoi tessellation generators for polycrystalline and granular films

I’ve added some new options for generating material parameter variations, in particular 2D and 3D Voronoi cells generators. For example see the figure below showing a polycrystalline structure generated for the K1 magneto-crystalline anisotropy constant.

This can be combined with a rotation generator by using the same pseudo-random generator seed number, to generate magneto-crystalline anisotropy easy axes variation between the different crystallites.

You can also simulate a granular structure with non-magnetic phase separation, by using either the 2D or 3D Voronoi cells generators directly on the magnetisation mesh. For example see the figure below showing a 3D granular structure with a magnetisation configuration obtained at zero field.

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