a bi 1‑x re x fe 1‑y tm y o 3 /cofe 2 o 4 Multiferroic composite film and preparation method thereof

A composite film and multiferroic technology, applied in the manufacture of inductors/transformers/magnets, the magnetism of inorganic materials, electrical components, etc., can solve the problems of large leakage current and weak magnetism, and achieve improved ferroelectric performance and high magnetic permeability rate, the effect of reducing the generation of oxygen vacancies

Active Publication Date: 2017-05-17
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] How to fix BiFeO 3 Due to the two major problems of large leakage current and weak magnetism, multiferroic materials with excellent properties are obtained, which is the focus of current research on single-phase magnetoelectric multiferroic materials.

Method used

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  • a bi <sub>1‑x</sub> re <sub>x</sub> fe <sub>1‑y</sub> tm <sub>y</sub> o <sub>3</sub> /cofe <sub>2</sub> o <sub>4</sub> Multiferroic composite film and preparation method thereof
  • a bi <sub>1‑x</sub> re <sub>x</sub> fe <sub>1‑y</sub> tm <sub>y</sub> o <sub>3</sub> /cofe <sub>2</sub> o <sub>4</sub> Multiferroic composite film and preparation method thereof
  • a bi <sub>1‑x</sub> re <sub>x</sub> fe <sub>1‑y</sub> tm <sub>y</sub> o <sub>3</sub> /cofe <sub>2</sub> o <sub>4</sub> Multiferroic composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Step 1, Co(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O is dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride at a molar ratio of 1:2, and stirred for 2 hours to obtain a uniformly mixed CoFe 2 o 4 Precursor, CoFe 2 o 4 The concentration of Co ions in the precursor solution is 0.1mol / L, and the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;

[0046] Step 2, the Bi(NO 3 ) 3 ·5H 2 O, Tb(NO 3 ) 3 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O and C 4 h 6 MnO 4 4H 2 O with a molar ratio of 0.94:0.11:0.98:0.02 (RE=Tb, TM=Mn, x=0.11, y=0.02, excess bismuth nitrate) was dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride, stirred for 2h , to get a uniformly mixed Bi 0.89 Tb 0.11 Fe 0.98 mn 0.02 o 3 Precursor, Bi 0.89 Tb 0.11 Fe 0.98 mn 0.02 o 3 The total concentration of metal ions in the precursor solution is 0.3mol / L, and the volume ratio of ethylene glycol methyl ether and a...

Embodiment 2

[0052] Step 1: Add Co(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O is dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride at a molar ratio of 1:2, and stirred for 2 hours to obtain a uniformly mixed CoFe 2 o 4 Precursor, CoFe 2 o 4 The concentration of Co ions in the precursor solution is 0.15mol / L, and the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;

[0053] Step 2: Bi(NO 3 ) 3 ·5H 2 O, Tb(NO 3 ) 3 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O and Cr(NO 3 ) 3 9H 2 O with a molar ratio of 0.94:0.11:0.98:0.02 (RE=Tb, TM=Cr, x=0.11, y=0.02, excess bismuth nitrate) was dissolved in the mixture of ethylene glycol methyl ether and acetic anhydride, and stirred for 2 hours , to get a uniformly mixed Bi 0.89 Tb 0.11 Fe 0.98 Cr 0.02 o 3 Precursor, Bi 0.89 Tb 0.11 Fe 0.98 Cr 0.02 o3 The total concentration of metal ions in the precursor solution is 0.3mol / L, and the volume ratio of ethylene glycol methyl ether and ace...

Embodiment 3

[0059] Step 1: Add Co(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O is dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride at a molar ratio of 1:2, and stirred for 2 hours to obtain a uniformly mixed CoFe 2 o 4 Precursor, CoFe 2 o 4 The concentration of Co ions in the precursor solution is 0.2mol / L, and the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;

[0060] Step 2: Bi(NO 3 ) 3 ·5H 2 O, Tb(NO 3 ) 3 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O and Co(NO 3 ) 2 ·6H 2 O with a molar ratio of 0.94:0.11:0.98:0.02 (RE=Tb, TM=Co, x=0.11, y=0.02, excess bismuth nitrate) was dissolved in the mixture of ethylene glycol methyl ether and acetic anhydride, and stirred for 2 hours , to get a uniformly mixed Bi 0.89 Tb 0.11 Fe 0.98 co 0.02 o 3 Precursor, Bi 0.89 Tb 0.11 Fe 0.98 co 0.02 o 3 The total concentration of metal ions in the precursor solution is 0.3mol / L, and the volume ratio of ethylene glycol methyl ether and a...

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Abstract

The invention provides a Bi1-xRExFe1-yTMyO3/CoFe2O4 multiferroic composite film and a preparation method thereof. The composite film comprises a Bi1-xRExFe1-yTMyO3 crystalline film and a CoFe2O4 crystalline film which are compounded together. The preparation comprises the following steps: firstly preparing Bi1-xRExFe1-yTMyO3 precursor solution and CoFe2O4 precursor solution respectively; then spin-coating to prepare a plurality of layers of CoFe2O4 films on a substrate; next preparing a plurality of layers of Bi1-xRExFe1-yTMyO3 films on the CoFe2O4 films through spin coating to obtain a target product. The equipment requirement is simple, the prepared film is good in uniformity, chemical components are accurate and controllable, the doping content is easy to control, and the ferroelectric property and the ferromagnetic property of the film are greatly improved, and the film has high residual polarization value and residual magnetization value.

Description

technical field [0001] The invention belongs to the field of functional materials and relates to a Bi 1-x RE x Fe 1-y tm y o 3 / CoFe 2 o 4 Multiferroic composite film and its preparation method. Background technique [0002] Single-phase magnetoelectric multiferroic materials have not been applied in practice so far, mainly because the Curie temperature of most single-phase materials is low, and the magnetoelectric effect is only available at extremely low temperatures, and the magnetoelectric effect is very weak . Although single-phase BiFeO 3 Both the Curie temperature and the Neel temperature of the material are above room temperature, but due to the BiFeO 3 The helical magnetic structure makes BiFeO 3 It exhibits G-type antiferromagnetism, and only shows weak ferromagnetism under low electric field, and its small magnetoelectric coupling characteristics hinder its practical application in multiferroics. On the contrary, multiferroic magnetoelectric composites ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/10H01F41/02
Inventor 谈国强罗洋洋董国华任慧君夏傲
Owner SHAANXI UNIV OF SCI & TECH
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