Abstract
We have studied the behavior of magnetic coercivity H c, across the geometric percolation in MBE grown epitaxial Ni films. By increasing a Cu buffer layer thickness, the morphology of Ni films changes from a collection of finite clusters to a single infinite cluster, while all other structural parameters remain constant. H c drops rapidly near the geometric percolation threshold. Atomic Force Microscopy shows the presence of an infinite cluster with fractal dimension D c∼1.9, in agreement with percolation theory. The suppression of H c may be due to increased domain wall motion within the infinite cluster.
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