Effects of high magnetic field annealing on FePt nanoparticles with shape-anisotropy and element-distribution-anisotropy

Abstract

The concave-cube FePt nanoparticles (NPs) with shape-anisotropy and element-distribution-anisotropy were annealed under a high magnetic field (HMF).

Regulating the morphology and structures of wet-chemical synthesized L10-FePtMn nanoparticles by applying magnetic fields

“…Firstly, the magnetization energy can promote the phase transition of FePt alloys from the disordered fcc phase to the ordered fct phase because the magnetic susceptibility of the fct phase is higher than that of the fcc phase. [16][17][18] Then, the Lorentz force or magneto-Archimedes effect can dominate the migration and convection process in solution, which originates from the magnetic sus-ceptibility differences among ions, atoms, and chemical solvents. As a result, the nucleation rate will increase and the size of fcc-FePt NPs will be refined.…”

“…[21][22][23] It is no doubt that the magnetic field will play an important role in the migration, growth, and phase transition processes in the wetchemical synthesis of FePt NPs with higher ordering degrees and smaller sizes. However, the normally used magnetic field strength to promote the disorder-order transition of FePt NPs is too high, [16][17][18]24 which is uneconomical to apply in largescale preparation. It is critical to reduce the magnetic field into the range of normal electromagnets (1-2 T).…”

Shape programmable T1–T2 dual-mode MRI nanoprobes for cancer theranostics

“…In addition, as a kind of special nanomaterial with inherent magnetic properties, cubic iron-platinum nanoparticles have been studied and applied increasingly in information storage, biosensors, biological separation, biological imaging and so on. 163 Yang et al constructed a nanoplatform FePt@MnO@ DSPE-PEG 5000 -FA through a seed-mediated nucleation and solvent exchange method. 109 The elements Pt/Fe are two excellent contrast agents for CT and T 2 -weighted MRI while Mn 2+ enhances T 1 -weighted MRI.…”

Small-Size Intermetallic FeMnPt Nanoparticles Electrocatalyst for HER Under Acidic and Alkaline Conditions

“…By employing the solid-phase isolation media (C–S, NaCl, , C, and so on , ) to resist the sintering and aggregation of NPs, the precursors are reduced simultaneously and the ordered intermetallic NPs are obtained at a relatively higher temperature. The intermetallic Pt-based NPs with highly ordered phases, fine sizes, and uniform element distributions can be synthesized by coordinating the reduction, nucleation, and growth processes. − The solid-state reaction method shows the possibility of synthesizing suitable Pt-based catalysts with controllable components and ordered phases for serving acidic or alkaline environments.…”