Multiferroic Bi1-xRExFe0.97-yMn0.03TMyO3/CoFe2O4 composite film and preparation method thereof

A cofe2o4, multiferroic technology, applied in the manufacture of inductors/transformers/magnets, inorganic material magnetism, electrical components, etc., can solve the problems of weak magnetism and large leakage current, and achieve high permeability and improved ferroelectric performance. , the effect of high chemical stability

Active Publication Date: 2015-04-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • 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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  • Multiferroic Bi1-xRExFe0.97-yMn0.03TMyO3/CoFe2O4 composite film and preparation method thereof
  • Multiferroic Bi1-xRExFe0.97-yMn0.03TMyO3/CoFe2O4 composite film and preparation method thereof
  • Multiferroic Bi1-xRExFe0.97-yMn0.03TMyO3/CoFe2O4 composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 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 0.1mol / L, and the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;

[0044] Step 2: Bi(NO 3 ) 3 ·5H 2 O, La(NO 3 ) 3 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O, C 4 h 6 MnO 4 4H 2 O and Co(NO 3 ) 2 ·6H 2 O is 0.95:0.1:0.95:0.03:0.02 (RE=La, TM=Co, x=0.1, y=0.02, excessive bismuth nitrate) is dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride by molar ratio, Stir for 2h to obtain a uniformly mixed Bi 0.9 La 0.1 Fe 0.95 mn 0.03 co 0.02 o 3 Precursor, Bi 0.9 La 0.1 Fe 0.95 mn 0.03 co 0.02 o 3 The total concentration of metal ions in the precursor solution is 0.3mol / L, and the volume ratio ...

Embodiment 2

[0050] 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;

[0051] Step 2: Bi(NO 3 ) 3 ·5H 2 O, Yb(NO 3 ) 3 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O, C 4 h 6 MnO 4 4H 2 O and Co(NO 3 ) 2 ·6H 2 O is 0.95:0.1:0.95:0.03:0.02 (RE=Yb, TM=Co, x=0.1, y=0.02, excessive bismuth nitrate) is dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride by molar ratio, Stir for 2h to obtain a uniformly mixed Bi 0.9 Yb 0.1 Fe 0.95 mn 0.03 co 0.02 o 3 Precursor, Bi 0.9 Yb 0.1 Fe 0.95 mn 0.03 co 0.02 o 3 The total concentration of metal ions in the precursor solution is 0.3mol / L, and the volume ratio...

Embodiment 3

[0057] 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 1.5h 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 2.5:1;

[0058] Step 2: Bi(NO 3 ) 3 ·5H 2 O, Sm(NO 3 ) 3 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O, C 4 h 6 MnO 4 4H 2 O and Cr(NO 3 ) 3 9H 2 O is 0.95:0.1:0.95:0.03:0.02 (RE=Sm, TM=Cr, x=0.1, y=0.02, excessive bismuth nitrate) is dissolved in the mixed solution of ethylene glycol methyl ether and acetic anhydride by molar ratio, Stir for 1.5h to obtain a uniformly mixed Bi 0.9 SM 0.1 Fe 0.95 mn 0.03 Cr 0.02 o 3 Precursor, Bi 0.9 SM 0.1 Fe 0.95 mn 0.03 Cr 0.02 o 3 The total concentration of metal ions in the precursor solution is 0.3mol / L, and the volume ratio ...

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Abstract

The invention provides a multiferroic Bi1-xRExFe0.97-yMn0.03TMyO3 / CoFe2O4 composite film and a preparation method thereof. The composite film comprises a Bi1-xRExFe0.97-yMn0.03TMyO3 crystalline state film and a CoFe2O4 crystalline state film. The preparation method comprises the following steps of respectively preparing Bi1-xRExFe0.97-yMn0.03TMyO3 precursor solution and CoFe2O4 precursor solution; spin coating on a substrate to prepare a plurality of layers of CoFe2O4 films, spin coating on the CoFe2O4 films to prepare a plurality of layers of Bi1-xRExFe0.97-yMn0.03TMyO3 films and accordingly obtaining a target product. According to the multiferroic Bi1-xRExFe0.97-yMn0.03TMyO3 / CoFe2O4 composite film and the preparation method thereof, the device requirement is simple, the prepared film is good in homogeneity, the doping content is easy to control, the ferroelectric property and the ferromagnetic property of the film are improved to a large extent, and the film is high in residual polarization value and residual polarization value.

Description

technical field [0001] The invention belongs to the field of functional materials and relates to multiferroic Bi 1-x RE x Fe 0.97-y mn 0.03 tm y o 3 / CoFe 2 o 4 Composite membrane and method for its preparation. 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 magnetoel...

Claims

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Application Information

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