Method for preparing hard magnetism iron platinum (FePt) nanometer-particles by using inorganic salt as precursor

A nanoparticle and hard magnetic technology, applied in the field of preparing hard magnetic FePt nanoparticles, can solve the problems of complex preparation process of hard magnetic L10-FePt nanoparticles, irregular nanoparticle morphology, uncontrollable size, etc. Industrialized production, excellent magnetic properties, low cost of raw materials
CN106541147AInactive Publication Date: 2017-03-29HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2017-03-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for preparing hard magnetism iron platinum (FePt) nanometer-particles by using inorganic salt as a precursor and relates to the method for preparing the hard magnetism FePt nanometer-particles. According to the method for preparing the hard magnetism FePt nanometer-particles, the present technical problems of the complex preparation process, high energy consumption, irregular morphology of the nanometer particles and uncontrollable sizes of hard magnetism L10- FePt nanometer-particles obtained by using the surface coating method to conduct high-temperature annealing or a salt bath method are resolved. The method includes the following steps that 1, mixing and stirring are conducted under the shielding gas; 2, heating is conducted; 3, cooling is conducted; and 4, washing and drying are conducted. An easy liquid phrase thermal synthesis method is adopted; oleylamine is used as a solvent, a surfactant and a reducing agent; then, high-temperature thermal reduction of ferrous chloride and potassium chloroplatinate is conducted under a nitrogen atmosphere; the hard magnetism L10- FePt nanometer-particles with excellent magnetic performance is obtained through one step of preparation; and the magnetic performance, morphology and sizes of a product are adjusted further by adjusting the heating rate and the reaction time.
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Description

Technical field

[0001] The invention relates to a method for preparing hard magnetic iron platinum nanoparticles.

[0002] technical background

[0003] Fe-platinum nanoparticles have good chemical stability and high magnetocrystalline anisotropy (7×10 6 J / cm 3 ), high Curie temperature (480℃) and extremely small superparamagnetic limit size (2.8-3.3nm), so the grain size can be reduced while maintaining high enough thermal stability to obtain smaller records The information unit achieves higher recording density and is therefore an ideal material for ultra-high density magnetic recording media. Since Sun Shouheng used wet chemical method in 2000, using dioctyl ether as solvent and hexadecanediol as reducing agent to reduce platinum acetylacetonate, while thermally decomposing iron pentacarbonyl, the monodisperse, particle size was prepared by reaction at 297℃ for 30 minutes It is a 4nm superparamagnetic face-centered cubic structure of iron platinum (fcc-FePt) nanoparticles. Aft...

Claims

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