Next: Stray field measurement
Previous: Three-dimensional model
By considering only two-dimensional cut-planes of the hexagonal
antispheres -- assuming that the individual layers behave
independently -- it is possible to simulate significantly larger
systems in the and directions than if attempting to perform a
simulation across a three-dimensional sample of similar proportions.
We can then measure the coercive field for different layers.
The hexagonal antisphere systems in Zhukov et al. (2003) can be mapped
two-dimensional samples by considering hexagonally-spaced circular
holes -- flat antidots -- in a thin film. By varying the ratio of
hole radius to spacing radius the surface of the antisphere
geometry at different heights can be modelled reasonably accurately.
Since larger systems can be simulated, the influence of the sample
edges detailed in section 6.3 is substantially
reduced (figure 6.6).