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• W4292114739 abstract "We employ an atomistic model using a nearest-neighbor Heisenberg Hamiltonian exchange to study computationally the dependence of the Curie temperature of $L{1}_{0}$-FePt on finite-size and surface effects in heat-assisted magnetic recording (HAMR) media. We demonstrate the existence of a size threshold at 3.5 nm below which the impact of finite-size effects starts to permeate into the center of the grains and contributes to the reduction of the Curie temperature. We find a correlation between the Curie temperature and the percentage of atomistic bonds lost on the surface as a function of grain size, which can be extended to apply to not only $L{1}_{0}$-FePt but also generic magnetic systems of any crystal structure. In a recording medium, the inevitable grain size dispersion leads to an irreducible contribution to the dispersion of the Curie temperature. Therefore, our paper gives insight into finite-size effects, which have been predicted to be a serious limitation of HAMR." @default.
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• W4292114739 date "2022-08-17" @default.
• W4292114739 modified "2023-10-17" @default.
• W4292114739 title "Influence of finite-size effects on the Curie temperature of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>L</mml:mi><mml:msub><mml:mn>1</mml:mn><mml:mn>0</mml:mn></mml:msub><mml:mtext>−</mml:mtext><mml:mi>FePt</mml:mi></mml:mrow></mml:math>" @default.
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• W4292114739 doi "https://doi.org/10.1103/physrevb.106.054421" @default.
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