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In response to the growing need to model the effect of grains on switching dynamics, we have expanded OOMMF's capability to model 2D through grains derived from Voronoi diagrams.
To use polycrystalline OOMMF, a Voronoi diagram must first be generated.
In the OOMMF simulation, the grains as described by the grain map are projected through the film.
The grain anisotropy axes information may be displayed or saved through the OOMMF mmDisp viewer utility.
(For the cubic anisotropy example, use :A_axes or :B_axes in place of :axes.) Once the problem is loaded into the OOMMF Oxsii application, send the driver "Magnetization" output to mmDisp, from which the axis directions can be directly viewed.
We used polycrystalline OOMMF to model a 100 nm disc, 6 nm thick, to mimic the experiment from Lau et all  in order to further understand the role of grain orientation.
We have fully integrated 2D polycrystalline capability for simulating sub-100 nm magnets in OOMMF. Magneto-crystalline anisotropy magnitude and direction, as well as exchange coupling strength may be defined separately for each grain.
OOMMF's micromagnetic predictions can be compared with the predictions computed by other programs, allowing researchers to make more accurate models of many computer storage materials.
Workshop participants from McGill University, the University of New Orleans, and Washington University gave presentations on how they have used OOMMF to support their micromagnetic research work.
More detailed information about OOMMF and the workshop may be found at the OOMMF web page, http://math.nist.gov/oommf/.
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