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Chemical method for synthesizing L10-FePt by sequentially coating nanopowder nuclear body

A l10-fept, nano-powder technology, applied in nanotechnology and other directions, can solve problems such as inappropriate use and difficult process operation, and achieve the effect of commercialization

Inactive Publication Date: 2012-10-03
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Thermal decomposition of carbonyl iron and reduction of platinum acetylacetonate are commonly used methods for the preparation of FePt nanoparticles in the early stage, but carbonyl iron is a volatile and highly toxic organic compound, and the process of preparation is difficult, so it is not suitable to use

Method used

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  • Chemical method for synthesizing L10-FePt by sequentially coating nanopowder nuclear body

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0014] 1. Prepare the solution: prepare the sample: mix H 2 PtCl 6 ·6H 2 O(n Pt mol) is soluble in water, the volume of water (liter) is related to n pt (mole) ratio is 25:1, dubbed into aqueous solution; FeCl 2 4H 2 O(n Fe mol) is soluble in water, the volume of water (liter) is related to n Fe (mole) ratio is 25:1, made into an aqueous solution, weighed CTAB n Fe +n Pt mol.

[0015] 2. Experimental steps

[0016] ① put n Fe +n Pt Put moles of CTAB into a three-necked flask to form an aqueous solution. The ratio of the volume of water (liter) to the molar amount of CTAB is 25:1. Heat to 70°C in a collector-type constant temperature heating magnetic stirrer, and continuously pass in argon protective gas for stirring.

[0017] ② Add hydrazine hydrate with a test tube Fe +n Pt Mole, followed by the dropper to H 2 PtCl 6 ·6H 2 One-tenth of the O solution was dropped into a three-necked flask, and stirred for 2 hours for reaction reduction.

[0018] ③ After the...

preparation example 2

[0024] 1. Prepare solution with example one.

[0025] 2. Experimental steps

[0026] ① Put CTAB(n Fe +n Pt mol) into a three-necked flask to form an aqueous solution, the ratio of the volume of water (liter) to the molar amount of CTAB is 25:1. Heat to 70°C in a collector-type constant temperature heating magnetic stirrer, and continuously pass in argon protective gas for stirring.

[0027] ② Add hydrazine hydrate with a test tube Fe +n Pt mol, followed by a dropper to FeCl 2 4H 2 One-tenth of the O solution was dropped into a three-necked flask, and stirred for 2 hours for reaction reduction.

[0028] ③ After the reaction is over, stop stirring, stop feeding argon, and add excess alcohol until the foam disappears. The reaction product was transferred to a beaker, filled with deionized water, and allowed to stand. After the black powder is completely settled, a permanent magnet is placed at the bottom of the beaker, and the supernatant is poured out. After repeating ...

preparation example 3

[0033] 1. Prepare solution with example one.

[0034] 2. Experimental steps

[0035] ① Put CTAB(n Fe +n Pt ) into a three-necked flask to make an aqueous solution, the ratio of the volume of water (liter) to the molar amount of CTAB is 25:1. Heat to 70°C in a collector-type constant temperature heating magnetic stirrer, and continuously pass in argon protective gas for stirring.

[0036]

x1

x2

x3

x4

x5

x6

x7

x8

x9

x10

Fe 2+

0.025V

0.042V

0.058V

0.072V

0.092V

0.108V

0.125V

0.142V

0.158V

0.175V

Pt 2+

0.025V

0.042V

0.058V

0.072V

0.092V

0.108V

0.125V

0.142V

0158V

0.175V

[0037] ② Add n with a test tube Fe +n Pt moles of hydrazine hydrate, followed by pipetting x1ml of H 2 PtCl 6 ·6H 2 O solution was dropped into a three-necked flask, and stirred for 2 hours for ...

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PUM

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Abstract

The invention relates to a chemical method for synthesizing L10-FePt by sequentially coating a nanopowder nuclear body. FePt nanoparticles with chemical degree of order is synthesized at lower temperature, and the chemical method aims at sequentially coating a Fe atom layer and a Pt atom layer on the generated nanoparticles in hydrothermal reduction so as to improve the degree of order of Fe element and Pt element and further prepare L10-FePt nanoparticles at lower temperature. According to the chemical method, the chemical degree of order of the nanoparticles is regulated by controlling the degree of order of the Fe element and the Pt element in particles, so that the L10-FePt nanoparticles can be synthesized at lower temperature. As the L10-FePt nanoparticles can be prepared at lower temperature, the large-scale industrial production of L10-FePt nanoparticles can be realized, and further the commercialization of magnetic storage media with super-high density can be realized.

Description

technical field [0001] The invention belongs to the field of FePt magnetic recording material development, and relates to a method of sequentially coating nano-powder nuclei to synthesize L1 0 -Chemistry of FePt involving a preparation of chemically ordered L1 0 - Chemistry of FePt nanoparticles. Background technique [0002] Perpendicular magnetic recording is one of the development directions of future information storage. L1 0 -FePt nanoparticles have high magnetocrystalline anisotropy, high coercive force, high magnetic energy product, high Curie temperature and very low superparamagnetic critical size, and have good chemical stability. There are obvious application prospects in the next generation of ultra-high areal density perpendicular magnetic recording media and in the fabrication of perpendicular magnetization magnetic tunnel junctions. Chemical synthesis, self-assembly L1 0 - FePt nanostructure, which has the advantages of easy-to-obtain raw materials, simpl...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02B82Y40/00
Inventor 白晓军曹崇德张媛媛
Owner NORTHWESTERN POLYTECHNICAL UNIV
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