论文标题
有限大小的影响对L10-Fept的居里温度的影响
Influence of the Finite-size Effects on the Curie Temperature of L10-FePt
论文作者
论文摘要
我们使用最近的邻居海森伯格汉密尔顿交换采用原子模型来研究L10-Fept对L10-Fept的居里温度对有限大小和表面效应的依赖性。我们证明了在3.5nm处的大小阈值的存在，而有限尺寸效应的影响开始渗透到谷物的中心，并有助于降低Curie温度。我们发现，居里温度与晶粒尺寸损失的原子键的百分比之间存在相关性，晶粒尺寸的函数可以扩展到不仅适用于L10-Fept，而且还适用于任何晶体结构的通用磁系统。该研究可以洞悉有限尺寸的效果，因为不可避免的晶粒尺寸分散剂会导致对Curie温度分散的不可还原的贡献，因此预计已被预测是HAMR的严重限制。
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 3.5nm below which the impact of finite-size effects start to permeate into the center of the grains and contribute 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. The investigation gives insight into finite-size effects which, because the inevitable grain size dispersion leads to an irreducible contribution to a dispersion of the Curie temperature, has been predicted to be a serious limitation of HAMR.
