In summary we have studied the geometric and the angular dependence of the coercivity in antidots Fe films. From our micromagnetic models we can conclude:
- The characteristic lengths for geometric scaling of coercivity resulting from the use of standard Fe material constants in simulations do not coincide with the experimental observations.
- The present implementation of a zone damaged by the lithography near antidots can not explain the difference between previous simulations and experimental results.
- Our micromagnetic simulations indicate that the hysteresis
process is determined by the nucleation-propagation
sequence triggered either by inhomogeneities present on the antidot surface or by externally nucleated domain wall. The results of the simulations suggest that the angular
dependence of coercivity is sensitive to the type of
nucleation present in the system.
- The magnetization reversal of the antidot region is influenced by the reversal of the external region. The results of the simulation of this influence in relation to the angular dependence of the coercivity coincide with the experimental behavior and seems to confirm the presence of the external domain wall. Additionally, the biaxial nature of the film determines the presence of two magnetization jumps in the demagnetization process.
2008-04-04
