Abstract
The concave-cube FePt nanoparticles (NPs) with shape-anisotropy and element-distribution-anisotropy were annealed under a high magnetic field (HMF). The NPs underwent spheroidization and phase transformation during the annealing process. The HMF hardly affected the spheroidizing process of NPs, but obviously facilitated the disorder-order transition of the L10-phase. The L10-phase content, ordering degree, and the coercivity of annealed NPs increased with enhancing the HMF strength. Those results indicated that the nucleation of the L10-phase and ordering diffusion of Fe/Pt atoms were promoted by the HMF.
Highlights
For the wet-chemical synthesized Pt-based binary or multicomponent alloy nanoparticles (NPs), the growth of anisotropic shapes always leads to an anisotropic distribution of the elements.[1,2] In the Pt–TM alloy NPs, the Pt atom enriches at the corner, and the transition metal atoms prefer to deposit on the surfaces.[1]
The shape-anisotropy of concave-cube FePt NPs is originated from the over-growth of truncated-cube or cube seeds along the h111i direction, and the Pt content is richer at corner-sites, which leads to the element-distribution-anisotropy.[5,6,7]
A er annealing, the size distributions are moved to le side, most sizes are between 5 and 11 nm, and the grain size of the FePt NPs decreases to about 8.51 nm
Summary
For the wet-chemical synthesized Pt-based binary or multicomponent alloy nanoparticles (NPs), the growth of anisotropic shapes always leads to an anisotropic distribution of the elements.[1,2] In the Pt–TM (transition metal) alloy NPs, the Pt atom enriches at the corner (along the h111i direction), and the transition metal atoms prefer to deposit on the surfaces (along the h100i direction).[1]. The wet-chemical synthesized concave-cube FePt NPs with shape-anisotropy and element-distributionanisotropy have been annealed under the HMF, the effects of HMF on shape, size, composition, crystal structure and magnetic properties of the FePt NPs were investigated.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
