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Atomistic modeling of magnetization reversal modes in L1<sub>0</sub> FePt nanodots with magnetically soft edges

Atomistic modeling of magnetization reversal modes in L10 FePt nanodots with magnetically soft edges

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LIAO, Jung-Wei, Unai ATXITIA, Richard F. L. EVANS, Roy W. CHANTRELL, Chih-Huang LAI, 2014. Atomistic modeling of magnetization reversal modes in L10 FePt nanodots with magnetically soft edges

@unpublished{Liao2014Atomi-31104, title={Atomistic modeling of magnetization reversal modes in L10 FePt nanodots with magnetically soft edges}, year={2014}, author={Liao, Jung-Wei and Atxitia, Unai and Evans, Richard F. L. and Chantrell, Roy W. and Lai, Chih-Huang} }

Atomistic modeling of magnetization reversal modes in L1<sub>0</sub> FePt nanodots with magnetically soft edges 2015-06-03T07:14:12Z Liao, Jung-Wei Atxitia, Unai Atxitia, Unai Chantrell, Roy W. Evans, Richard F. L. Evans, Richard F. L. Chantrell, Roy W. Liao, Jung-Wei Lai, Chih-Huang eng 2015-06-03T07:14:12Z 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<sub>0</sub> ordering required for a high magnetocrystalline anisotropy. Using an atomistic spin model, we study the magnetization reversal behavior of L1<sub>0 </sub> 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. The nucleation field and the activation volume manipulate the 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. 2014 Lai, Chih-Huang

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