Ferromagnetic CoFe2-xLaxO4 film and preparation method thereof

A ferromagnetic thin film, cubic technology, applied in the coating and other directions, can solve the problems of the hysteresis loop squareness not being improved, the hysteresis loop squareness being low, limiting the application of cobalt ferrite, etc., and the preparation process is easy to control. , Excellent ferromagnetic properties, precise and controllable chemical composition

Active Publication Date: 2018-11-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to its small residual magnetization, large saturation magnetization and low coercive field, the squareness of its hysteresis loop is low, which lim

Method used

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  • Ferromagnetic CoFe2-xLaxO4 film and preparation method thereof
  • Ferromagnetic CoFe2-xLaxO4 film and preparation method thereof
  • Ferromagnetic CoFe2-xLaxO4 film and preparation method thereof

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preparation example Construction

[0027] The CF 2-x L x The preparation method of O ferromagnetic thin film, comprises the following steps:

[0028] Step 1: Dissolving cobalt nitrate, iron nitrate and lanthanum nitrate in ethylene glycol methyl ether in a molar ratio of 1:(2-x):x, stirring evenly, adding acetic anhydride, and continuing to stir evenly to obtain a precursor solution; x=0.03~0.15;

[0029] Step 2: Spin-coat the precursor solution on the FTO / glass substrate to obtain a wet film, bake the wet film at 170-190°C to obtain a dry film, and then anneal it in air at 620-640°C to obtain Crystalline CoFe 2-x La x o 4 film;

[0030] Step 3: Incorporate crystalline CoFe 2-x La x o 4 The film is cooled to room temperature, and step 2 is repeated until the desired thickness is obtained, that is, CoFe 2-x La x o 4 film.

[0031] The total concentration of metal ions in the precursor solution in the step 1 is 0.2-0.4 mol / L.

[0032]The volume ratios of ethylene glycol methyl ether and acetic anhyd...

Embodiment 1

[0039] Step 1: Clean the FTO / glass substrate with detergent, acetone, and absolute ethanol respectively and seal it in absolute ethanol for later use;

[0040] Step 2: Cobalt nitrate and ferric nitrate are used as raw materials, dissolved in ethylene glycol methyl ether at a molar ratio of 1:2, stirred for 30 minutes, then added with acetic anhydride, stirred for 90 minutes, and a stable solution with a total concentration of metal ions of 0.2mol / L is obtained. The precursor liquid; Wherein the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;

[0041] Step 3: Wash the FTO / glass substrate with deionized water and use N 2 Blow dry, and then irradiate the clean FTO / glass substrate with an ultraviolet light irradiation instrument for 40 minutes, so that the surface of the FTO / glass substrate can reach atomic cleanliness;

[0042] Step 4: Then spin-coat the precursor solution on the FTO / glass substrate, the coating speed is 4000r / min, and the coating time ...

Embodiment 2

[0045] CoFe 2-x La x o 4 Ferromagnetic film, wherein, x=0.03, its preparation method is:

[0046] Step 1: Clean the FTO / glass substrate with detergent, acetone, and absolute ethanol respectively and seal it in absolute ethanol for later use;

[0047] Step 2: Cobalt nitrate, iron nitrate and lanthanum nitrate are used as raw materials, dissolved in ethylene glycol methyl ether at a molar ratio of 1:1.97:0.03, stirred for 30 minutes, then added with acetic anhydride, stirred for 90 minutes, and the total concentration of metal ions is 0.2 mol / L stable precursor solution; wherein the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;

[0048] Step 3: Wash the FTO / glass substrate with deionized water and use N 2 Blow dry, and then irradiate the clean FTO / glass substrate with an ultraviolet light irradiation instrument for 40 minutes, so that the surface of the FTO / glass substrate can reach atomic cleanliness;

[0049] Step 4: Then spin-coat the precurso...

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Abstract

The invention provides a ferromagnetic CoFe2-xLaxO4 film and a preparation method thereof. X is 0.03-0.15. The preparation method comprises the steps that 1, cobalt nitrate, ferric nitrate and lanthanum nitrate are dissolved in ethylene glycol monomethyl ether, acetic anhydride is added after even stirring, stirring continues to each even mixing, and a precursor is obtained; 2, an FTO/glass substrate is spin-coated with the precursor to obtain wet film, the wet film is evenly coated with adhesive, then dry film is obtained through baking at the temperature of 170-190 DEG C and then is annealedin air at the temperature of 620-640 DEG C, and crystalline CoFe2-xLaxO4 film is obtained; 3, the crystalline CoFe2-xLaxO4 film is cooled, the step 2 is repeated to reach preset thickness, and the ferromagnetic CoFe2-xLaxO4 film is obtained. Doped La3+ irons mainly replace Fe, the rectangle degree of a hysteresis loop is improved, and the ferromagnetic property of the CoFe2O4-based film is improved.

Description

technical field [0001] The invention belongs to the field of functional materials and relates to the preparation of CoFe on the surface of a functionalized FTO / glass substrate 2-x La x o 4 (CF 2-x L x O) ferromagnetic thin film, specifically a kind of CoFe 2-x La x o 4 Ferromagnetic thin film and its preparation method. Background technique [0002] Now that the world has entered the information age, with the development of the times, the development of the information industry is inseparable from storage technology. Information storage technology includes magnetic recording information storage technology, optical information storage technology, and semiconductor flash memory technology. At present, the storage technology of magnetic recording has great advantages, and has great development potential and application prospects. Cobalt ferrite (CoFe 2 o 4 ), referred to as CFO, is a hard magnetic material with magnetostrictive properties. It has high coercive field,...

Claims

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Application Information

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IPC IPC(8): C03C17/25
CPCC03C17/25C03C2217/242C03C2218/116
Inventor 谈国强薛敏涛柴正军任慧君夏傲刘婷刘云
Owner SHAANXI UNIV OF SCI & TECH
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