Abstract：FeCo nanoparticles are excellent magnetic materials with important potential applications. Normally, the FeCo nanomaterials present low coercivity, which are soft magnetic materials. In order to prepare FeCo hard magnetic nanoparticles, a novel wet-chemical method is proposed. In this method, L10-AuCu seed particles were firstly prepared, and then Fe and Co atoms epitaxially grew on the surface of seed particles to form AuCu@FeCo core-shell nanoparticles. The ordered structure of L10-AuCu seed crystal interface could induce FeCo shells to form hard magnetic nanoparticles. In the synthesis of AuCu seed crystal particles, the AuCu seed crystals gradually changed from disorder to order, and the morphology and dispersion of the particles also gradually improved with the increase of reaction temperature. At 340 ℃, well-dispersed and highly ordered L10-AuCu seed crystals were obtained. The amount of FeCo addition has an important effect on the morphology and magnetic properties of FeCo shells. When the FeCo addition amount is x=0.085 mmol, the AuCu@FeCo hard magnetic nanoparticles with good dispersion and coercivity reached 605 Oe were obtained. The interfacial induction method provides a new idea for the preparation of FeCo hard magnetic nanoparticles with good dispersion and high coercivity.
2023, Vol. 30 