Enhanced magnetic moments in Mn-doped FeCo clusters owing to ferromagnetic surface Mn atoms
Enhanced magnetic moments in Mn-doped FeCo clusters owing to ferromagnetic surface Mn atoms
复制标题
由于铁磁表面 Mn 原子,Mn 掺杂 FeCo 簇中的磁矩增强
DOI:
10.1103/physrevmaterials.3.044402
复制
发表时间:
2019
影响因子:
3.4
通讯作者:
Chelikowsky, James R.
中科院分区:
文献类型:
--
作者:
Sakurai, Masahiro;Chelikowsky, James R.
We provide an avenue to achieve optimized magnetic properties without relying on rare-earth elements. In particular, we focus on transition-metal nanoparticles with magnetic ordering that is rarely seen in bulk. By using first-principles real-space pseudopotential calculations, we show that Mn can exhibit ferromagnetic behavior similar to Fe when Mn is placed on the surface of a FeCo cluster. This ferromagnetic behavior of surface Mn is in sharp contrast with Mn bulk and Mn-based alloys, which are either antiferromagnetic or paramagnetic. The local magnetic moment carried by a surface Mn atom is larger than those of Fe and Co, leading to an increase of the total magnetic moment. We find that surface-Mn-induced magnetic enhancement is robust in ternary MnFeCo clusters with different sizes and various chemical compositions. Our theoretical findings provide a useful guide for designing new nanoparticles with a large magnetic moment.
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