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• W104289364 abstract "Nanopatterned FePt nano dots often exhibit low coercivity and a broad switching field distribution, which could arise due to edge damage during the patterning process causing a reduction in the $L1_{0}$ ordering required for a high magnetocrystalline anisotropy. Using an atomistic spin model, we study the magnetization reversal behavior of $L1_{0}$ FePt nanodots with soft magnetic edges. We show that reversal is initiated by nucleation for the whole range of edge widths studied. For narrow soft edges the individual nucleation events dominate reversal; for wider edges, multiple nucleation at the edge creates a circular domain wall at the interface which precedes complete reversal. Our simulations compare well with available analytical theories. The increased edge width further reduces and saturates the required nucleation field, together with the activation volume manipulating the corresponding thermally induced switching field distribution. By control of the properties of dot edges using proper patterning methods, it should be possible to realize exchange spring bit patterned media without additional soft layers." @default.
• W104289364 created "2016-06-24" @default.
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• W104289364 date "2014-07-05" @default.
• W104289364 modified "2023-10-17" @default.
• W104289364 title "Magnetization reversal modes in $L1_{0}$ FePt nanodots with magnetically soft edges" @default.
• W104289364 hasPublicationYear "2014" @default.
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