Influence of finite-size effects on the Curie temperature of L10-FePt

BINH, Nguyen Thanh, RUTA, Sergiu, HOVORKA, Ondrej, EVANS, Richard FL and CHANTRELL, Roy W (2022). Influence of finite-size effects on the Curie temperature of L10-FePt. Physical Review B, 106: 054421.

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Abstract

We employ an atomistic model using a nearest-neighbor Heisenberg Hamiltonian exchange to study computationally the dependence of the Curie temperature of L10-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 L10-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.

Item Type:	Article
Uncontrolled Keywords:	34 Chemical sciences; 40 Engineering; 51 Physical sciences
Identification Number:	https://doi.org/10.1103/physrevb.106.054421
SWORD Depositor:	Symplectic Elements
Depositing User:	Symplectic Elements
Date Deposited:	21 Mar 2024 14:14
Last Modified:	21 Mar 2024 14:15
URI:	https://shura.shu.ac.uk/id/eprint/33314

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