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Nanopatterned FePt nano-dots often exhibit low coercivity and a broadswitching field distribution, which could arise due to edge damage during thepatterning process causing a reduction in the $L1_{0}$ ordering required for ahigh magnetocrystalline anisotropy. Using an atomistic spin model, we study themagnetization reversal behavior of $L1_{0}$ FePt nanodots with soft magneticedges. We show that reversal is initiated by nucleation for the whole range ofedge widths studied. For narrow soft edges the individual nucleation eventsdominate reversal; for wider edges, multiple nucleation at the edge creates acircular domain wall at the interface which precedes complete reversal. Oursimulations compare well with available analytical theories. The increased edgewidth further reduces and saturates the required nucleation field. Thenucleation field and the activation volume manipulate the thermally inducedswitching field distribution. By control of the properties of dot edges usingproper patterning methods, it should be possible to realize exchange spring bitpatterned media without additional soft layers.

Atomistic modeling of magnetization reversal modes in $L1_{0}$ FePt nanodots with magnetically soft edges