Cobalt doped iron bismuth titanate multiferroic thin film material and preparation method thereof

A technology of iron bismuth titanate and thin film material, applied in the field of cobalt-doped iron bismuth titanate multiferroic thin film material and preparation thereof, can solve the problems of small residual magnetization and electric polarization, restricting application and the like, and achieves less equipment. , the preparation method is scientific, the effect of wide application prospect

Inactive Publication Date: 2014-03-26
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this chemical formula is Bi 5 Fe 0.5 co 0.5 Ti 3 o 15 There are deficiencies in the multiferroic film and its preparation method. First, the chemical formula is Bi 5 Fe 0.5 co 0.5 Ti 3 o 15 Although ferromagnetism and ferroelectricity coexist in the multiferroic film at room temperature, it also has defects of small residual magnetization and electric polarization, which restricts its application; secondly, various preparation methods cannot obtain Better than the formula Bi 5 Fe 0.5 co 0.5 Ti 3 o 15 The product of remanent magnetization and electric polarization of multiferroic thin films

Method used

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  • Cobalt doped iron bismuth titanate multiferroic thin film material and preparation method thereof
  • Cobalt doped iron bismuth titanate multiferroic thin film material and preparation method thereof
  • Cobalt doped iron bismuth titanate multiferroic thin film material and preparation method thereof

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Effect test

Embodiment 1

[0024] The concrete steps of preparation are:

[0025]Step 1, according to the molar ratio of bismuth, iron, cobalt and titanium is the ratio of 6.05: 2-x: x: 3, wherein, x=0.1, after weighing bismuth nitrate, iron nitrate, cobalt acetate and n-butoxide titanium, first Add bismuth nitrate, iron nitrate, cobalt acetate and titanium n-butoxide in turn to the mixed solution of acetic acid and acetylacetone under stirring at 70°C until it is completely dissolved; then stir at room temperature for 5 hours to obtain a concentration of 0.1mol / L A precursor solution, wherein the molar ratio of acetic acid to acetylacetone is 3.5:6.5.

[0026] Step 2, first apply the precursor solution to the substrate, and then heat it at 90°C for 7 minutes; wherein, the coating is spin coating, the rotation speed during spin coating is 4000r / min, the time is 120s, and the substrate is a metal substrate platinum sheet , to obtain a substrate covered with a gel film. Then, the substrate covered with ...

Embodiment 2

[0029] The concrete steps of preparation are:

[0030] Step 1, according to the molar ratio of bismuth, iron, cobalt and titanium is the ratio of 6.05: 2-x: x: 3, wherein, x=0.3, after weighing bismuth nitrate, iron nitrate, cobalt acetate and n-butoxide titanium, first Add bismuth nitrate, iron nitrate, cobalt acetate and titanium n-butoxide in sequence to the mixed solution of acetic acid and acetylacetone under stirring at 73°C until it is completely dissolved; then stir at room temperature for 5.5h to obtain a concentration of 0.12mol / A precursor solution of L, wherein the molar ratio of acetic acid to acetylacetone is 3.8:6.3.

[0031] Step 2, after coating the precursor solution on the substrate, heat it at 95°C for 6.5 minutes; wherein, the coating is spin coating, the rotation speed during spin coating is 5000r / min, and the time is 95s, and the substrate is metal substrate platinum sheet to obtain a substrate covered with a gel film. Then, the substrate covered with...

Embodiment 3

[0034] The concrete steps of preparation are:

[0035] Step 1, according to the molar ratio of bismuth, iron, cobalt and titanium is the ratio of 6.05: 2-x: x: 3, wherein, x=0.6, after weighing bismuth nitrate, iron nitrate, cobalt acetate and titanium n-butoxide, first Add bismuth nitrate, iron nitrate, cobalt acetate and titanium n-butoxide in turn to the mixed solution of acetic acid and acetylacetone under stirring at 75°C until it is completely dissolved; then stir at room temperature for 6 hours to obtain a concentration of 0.13mol / L precursor solution, wherein the molar ratio of acetic acid to acetylacetone is 4:6.

[0036] Step 2, first apply the precursor solution to the substrate, and then heat it at 100°C for 6 minutes; wherein, the coating is spin coating, the rotation speed during spin coating is 6000r / min, and the time is 65s, and the substrate is a metal substrate platinum sheet , to obtain a substrate covered with a gel film. Then, the substrate covered with ...

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Abstract

The invention discloses a cobalt doped iron bismuth titanate multiferroic thin film material and a preparation method thereof. The material is a multiferroic thin film with a chemical formula of Bi6Fe2- xCoxTi3O18, the thickness of the thin film is not smaller than 400 nm, and the thin film is composed of densely arranged particles with particle sizes of 20-100 nm. The preparation method comprises the following steps: sequentially adding bismuth nitrate, ferric nitrate, cobalt acetate and n-butyl titanium in a mixed solution of acetic acid and acetylacetone to completely dissolve the components, stirring for at least 5 hours at room temperature to obtain a precursor solution, then, coating the precursor solution on a substrate, heating the substrate to obtain a substrate coated with a gel film, pyrolyzing the substrate coated with the gel film to obtain a substrate coated with a thin film, repeating the coating, after heating and pyrolyzing for multiple times, annealing the substrate coated with multiple layers of thin films, and separating the multiple layers of thin films with the substrate to obtain a target product. The cobalt doped iron bismuth titanate multiferroic thin film material has excellent residual magnetization intensity and polarization strength, thereby having a wide application prospect and great potential in spintronics and other fields.

Description

technical field [0001] The invention relates to a film material and a preparation method thereof, in particular to a cobalt-doped iron bismuth titanate multiferroic film material and a preparation method thereof. Background technique [0002] A multiferroic material is a multifunctional material that combines magnetism and electricity. It not only has the coexistence of ferromagnetism and ferroelectricity, but also has a ferromagnetic coupling synergy such as the magnetoelectric effect (that is, the material is in an external magnetic field. Electric polarization is generated under the action of an external electric field, or the characteristics of magnetic polarization are generated under the action of an external electric field), and the polarization vectors that can represent information such as magnetization and electric polarization are closely linked, which provides different methods for reading on storage media. By combining the advantages of various control methods, ...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/622
Inventor 杨杰刘哲汤现武尹利华朱雪斌戴建明孙玉平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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