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Ferrite nanometer particle embedded antiferromagnetic oxide matrix composite material and preparation method

A technology of nanoparticles and composite materials, which is applied in the fields of magnetic materials, inorganic materials, magnetic objects, etc., can solve problems such as less research, and achieve the effects of simple operation, low cost, and easy chemical ratio.

Inactive Publication Date: 2008-10-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, there are few studies on ferromagnetic / antiferromagnetic nanocomposites of all oxides

Method used

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  • Ferrite nanometer particle embedded antiferromagnetic oxide matrix composite material and preparation method
  • Ferrite nanometer particle embedded antiferromagnetic oxide matrix composite material and preparation method
  • Ferrite nanometer particle embedded antiferromagnetic oxide matrix composite material and preparation method

Examples

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Effect test

Embodiment 1

[0028] CuFe with a sintering temperature of 900 °C was prepared according to the above method 2 o 4 Composite materials with nanoparticles embedded in CuO antiferromagnetic matrix. The first step is to weigh copper nitrate and iron nitrate according to the chemical molar ratio of antiferromagnetic oxide ions and iron ions at 100:1, wherein the copper nitrate is 0.03mol and the iron nitrate is 0.003mol, and they are mixed and dissolved in 300mL deionized In water, configure a mixed solution of metal ions with a copper ion concentration of 0.1mol / L; in the second step, weigh 0.07mol ammonium bicarbonate according to the stoichiometric ratio, dissolve it in 35mL deionized water, and configure a molar concentration of 2mol / L carbonic acid Aqueous solution of hydrogen ammonia, ammonia bicarbonate should be over 10%. Under continuous stirring, add the aqueous solution of ammonium bicarbonate to the above-mentioned mixed solution of metal ions, add 0.5mL ammonia water to adjust the ...

Embodiment 2

[0030] NiFe with a sintering temperature of 600 °C was prepared according to the above method 2 o 4 Composite materials with nanoparticles embedded in NiO antiferromagnetic matrix. In the first step, nickel nitrate and iron nitrate are weighed according to the chemical molar ratio of antiferromagnetic oxide ions and iron ions to be 10:1, wherein nickel nitrate is 0.03mol, iron nitrate is 0.003mol, mixed and dissolved in 300mL deionized In water, configure a metal ion mixed solution with a nickel ion concentration of 0.1mol / L; in the second step, weigh 0.07mol ammonium bicarbonate according to the stoichiometric ratio, dissolve it in 35mL deionized water, and configure a molar concentration of 2mol / L carbonic acid Aqueous solution of hydrogen ammonia, ammonia bicarbonate should be over 10%. Under continuous stirring, add the aqueous solution of ammonium bicarbonate to the above-mentioned mixed solution of metal ions, add 0.5mL ammonia water to adjust the pH=7, and form a preci...

Embodiment 3

[0032] NiFe with a sintering temperature of 700 °C was prepared according to the above method 2 o 4 Composite materials with nanoparticles embedded in NiO antiferromagnetic matrix. In the first step, nickel nitrate and iron nitrate are weighed according to the chemical molar ratio of antiferromagnetic oxide ions and iron ions at 1:2, wherein nickel nitrate is 0.03mol and iron nitrate is 0.003mol, and they are mixed and dissolved in 300mL deionized In water, configure a metal ion mixed solution with a nickel ion concentration of 0.4mol / L; in the second step, weigh 0.07mol ammonium bicarbonate according to the stoichiometric ratio, dissolve it in 35mL deionized water, and configure a molar concentration of 2mol / L carbonic acid Hydrogen ammonium aqueous solution, ammonia bicarbonate should be over 10%. Under continuous stirring, add the aqueous ammonium bicarbonate solution to the above metal ion mixed solution, add 0.5mL ammonia water to adjust the pH=7.5, and form a precipitat...

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Abstract

The invention relates to a composite material used for embedding ferrite nanoparticles into antiferromagnetic oxide base and a preparation method thereof. The preparation method comprises the following steps: (1) mixing solution of metal ions is prepared; (2) ammonium hydrogencarbonate aqueous solution is added into the mixing solution of the metal ions so as to form sediment; (3) the obtained sediment is filtered, washed and dried until dry powder is obtained; (4) the obtained powder is sintered in the air at high temperature, thus forming the composite material used for embedding the ferrite nanoparticles into the antiferromagnetic oxide base. The composite material used for embedding the ferrite nanoparticles into the antiferromagnetic oxide base prepared by the method has magnetic exchange bias effect.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and in particular relates to a composite material in which ferrite nanoparticles are embedded in an antiferromagnetic oxide matrix and a preparation method. Background technique [0002] Since the discovery of the giant magnetoresistance effect in 1988, the research on spintronics has attracted great attention from the scientific and industrial circles. Among them, the spintronic devices represented by magnetic random access memory (MRAM) have increased the storage density of the memory dozens of times in the past ten years, which greatly meets the requirements of the development of device miniaturization. However, with the further miniaturization of devices, the particle size of magnetic materials decreases. When the size is lower than the critical size, the magnetic particles will exhibit superparamagnetic behavior, making the magnetic particles lose their storage function, which limits the fu...

Claims

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Application Information

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IPC IPC(8): H01F1/032H01F1/11C04B35/26C04B35/64
Inventor 袁松柳田召明王永强何惊华
Owner HUAZHONG UNIV OF SCI & TECH
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