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Preparation method of nickel ferrite magnetic nanocomposite material

A technology of magnetic nano and composite materials, applied in nickel compounds, nanotechnology, nanotechnology, etc., can solve problems such as limiting the development of miniaturization of magnetic storage devices

Active Publication Date: 2015-09-23
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because the magnetocrystalline anisotropy energy of each nanoparticle decreases with the decrease of the particle size, the thermal disturbance can easily make the magnetic nanoparticle lose the stable magnetic order and become superparamagnetic, which limits the Further Miniaturization Development of Magnetic Memory Devices

Method used

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  • Preparation method of nickel ferrite magnetic nanocomposite material
  • Preparation method of nickel ferrite magnetic nanocomposite material
  • Preparation method of nickel ferrite magnetic nanocomposite material

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Experimental program
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specific Embodiment approach 1

[0012] Specific implementation mode 1: First obtain ordered NiFe by nano-replication method 2 o 4 Magnetic nanomaterials: 2 g SBA-15, 6.73 g Fe(NO 3 ) 3 9H 2 O and 2.42 g Ni(NO 3 ) 2 6H 2 O was put into a polytetrafluoroethylene cup, added alcohol and stirred until dry, then added n-hexane and stirred until it was powdered, and then put it into a muffle furnace for calcination at 700°C for 6 h. After the sample is cooled, wash it twice with 1.6 mol / L hot NaOH to remove the template, centrifuge and wash it with deionized water until it is neutral, and dry it with alcohol suction to obtain NiFe 2 o 4 magnetic nanomaterials. Secondly, NiO / NiFe is obtained by impregnation method 2 o 4 Magnetic Nanocomposites: According to N 2 NiFe measured by physical adsorption instrument 2 o 4 Pore ​​volume of magnetic nanomaterials, calculate the Ni(NO 3 ) 2 6H 2 O quality. Weigh 0.31g Ni(NO 3 ) 2 6H 2 O, 0.982 g NiFe 2 o 4 Put it into a polytetrafluoroethylene cup, add ...

specific Embodiment approach 2

[0013] Specific implementation mode 2: First obtain ordered NiFe by nano-replication method 2 o 4 Magnetic nanomaterials: 2 g SBA-15, 6.73 g Fe(NO 3 ) 3 9H 2 O and 2.42 g Ni(NO 3 ) 2 6H 2 O was put into a polytetrafluoroethylene cup, added alcohol and stirred until dry, then added n-hexane and stirred until it was powdered, and then put it into a muffle furnace for calcination at 700°C for 6 h. After the sample is cooled, wash it twice with 1.6 mol / L hot NaOH to remove the template, centrifuge and wash it with deionized water until it is neutral, and dry it with alcohol suction to obtain NiFe 2 o 4 Magnetic Nanomaterials. Secondly, NiO / NiFe is obtained by impregnation method 2 o 4 Magnetic Nanocomposites: According to N 2 NiFe measured by physical adsorption instrument 2 o 4 Pore ​​volume of magnetic nanomaterials, calculate the Ni(NO 3 ) 2 6H 2 O quality. Weigh 0.31g Ni(NO 3 ) 2 6H 2 O, 0.982 g NiFe 2 o 4 Put it into a polytetrafluoroethylene cup, add ...

specific Embodiment approach 3

[0014] Specific implementation mode 3: first obtain ordered NiFe by nano-replication method 2 o 4 Magnetic nanomaterials: 2 g SBA-15, 6.73 g Fe(NO 3 ) 3 9H 2 O and 2.42 g Ni(NO 3 ) 2 6H 2 O was put into a polytetrafluoroethylene cup, added alcohol and stirred until dry, then added n-hexane and stirred until it was powdered, and then put it into a muffle furnace for calcination at 700°C for 6 h. After the sample is cooled, wash it twice with 1.6 mol / L hot NaOH to remove the template, centrifuge and wash it with deionized water until it is neutral, and dry it with alcohol suction to obtain NiFe 2 o 4 magnetic nanomaterials. Secondly, NiO / NiFe is obtained by impregnation method 2 o 4Magnetic Nanocomposites: According to N 2 NiFe measured by physical adsorption instrument 2 o 4 Pore ​​volume of magnetic nanomaterials, calculate the Ni(NO 3 ) 2 6H 2 O quality. Weigh 0.31 g Ni(NO 3 ) 2 6H 2 O, 0.982 g NiFe 2 o 4 Put it into a polytetrafluoroethylene cup, add ...

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Abstract

The invention synthesizes a nickel ferrite magnetic nanocomposite material by two steps. Firstly, an ordered mesoporous SBA-15 is adopted as a template, the mesoporous nickel ferrite magnetic nanowire is synthesized by a nanometer copy method, and then the ordered nickel ferrite magnetic nanocomposite material is synthesized by an impregnation method. The magnetic nanocomposite material has a significant exchange biasing field (HEB) and a large coercive force (Hc). According to the nickel ferrite magnetic nanocomposite material, depending on the exchange biasing effect of antiferromagnetic and ferrimagnetic interfaces, super paramagnetic phenomenon of the nanometer material can be well inhibited, and application of the nanometer material in the fields of magnetic recording and spin electronic devices is facilitated.

Description

technical field [0001] This patent relates to a nickel ferrite (NiFe 2 o 4 ) The preparation method of magnetic nanocomposite materials can use antiferromagnetic particles and NiFe 2 o 4 Exchange bias effects to address superparamagnetic phenomena in nanomaterials. Background technique [0002] NiFe 2 o 4 It is a typical spinel soft magnetic ferrite, which has excellent high-frequency performance, high resistivity and magnetic permeability. And easy to prepare, with good chemical stability. It has a wide range of applications in transformers, inductor cores, filter coils and microwave absorption. [0003] Because the magnetocrystalline anisotropy energy of each nanoparticle decreases with the decrease of the particle size, the thermal disturbance can easily make the magnetic nanoparticle lose the stable magnetic order and become superparamagnetic, which limits the Further miniaturization development of magnetic memory devices. In 2003, Skumryev et al. reported [Skum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/36H01F41/00C01G53/00B82Y30/00B82Y40/00
Inventor 王新庆张贝贝徐靖才金顶峰彭晓领洪波金红晓葛洪良
Owner CHINA JILIANG UNIV
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