Method for one-step synthesis of FePt nanoparticles with an fct (face centered tetragonal) structure and product thereof

Abstract

The invention relates to a method for one-step synthesis of FePt nanoparticles with an fct (face centered tetragonal) structure and a product thereof. The method comprises the steps of: adding reactants such as acetylacetone platinum and the like into a high boiling point organic solvent, introducing an inert gas, heating, cooling, then adding an n-hexane-ethanol mixed liquor, carrying out centrifugal separation, removing a centrifugal supernatant liquor, dropwise adding n-hexane and ethanol into the residue, carrying out the centrifugal separation, drying the residue and measuring the magnetism and the structure of the nanoparticles of the residue by utilizing a PPMS (Physical Property Measuring System) and an XRD (X Ray Diffraction). By utilizing the method provided by the invention, FePt nanoparticles with the fct phase are synthesized at a temperature of 320 DEG C, an aggregation problem of the nanoparticles, which always exists in the prior art, is solved without a high temperature annealing process and the coercive force of the FePt nanoparticles with the fct phase is up to 7300Oe. In the prior art, if the coercive force is up to 7300Oe, the annealing process needs to be carried out at a temperature of 500 DEG C and the aggregation problem of the nanoparticles is brought on by the process.

Description

【Technical field】 [0001] The invention belongs to the field of nanotechnology. More specifically, the present invention relates to a method for synthesizing FePt nanoparticles with a face-centered tetragonal structure in one step, and to the FePt nanoparticles with a face-centered tetragonal structure prepared by the method. 【Background technique】 [0002] With the development of magnetic storage, people have put forward higher and higher requirements for its performance, especially the recording capacity. From the original Winchester hard disk, to the later magnetoresistive head, giant magnetoresistive head, and then to the later AFC (antiferromagnetic coupling) storage medium, the recording density of magnetic storage materials needs to be continuously improved to meet the growing needs of people . For this reason, Seagate Corporation, an American hard disk manufacturer, proposed research on self-organized magnetic nano-arrays, and its storage density is expected to reac...

AI Technical Summary

Problems solved by technology

In order to avoid the agglomeration of nanoparticles, many research groups adopt doping methods, such as doping FePt with Au, Ag, Sb and other metals. Due to the presence of doping elements, the annealing temperature required to achieve the same degree of phase transition can be reduced. , so as to improve particle agglomeration to a certain extent, however, this method also requires this annealing temperature to reach at least 400 ° C, not only that, but the nanoparticles obtained at this annealing temperature still have a certain degree of agglomeration

In order to fundamentally solve this problem, some research groups in the world have put forward the idea of ​​overcoming this technical defect, that is, to synthesize FePt in fct phase by one-step chemical reaction, but the phase transition of nanoparticles obtained so far is not sufficient, and the coercive force is not high.

Images