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a cofe 2-x la x o 4 Ferromagnetic film and preparation method thereof

A ferromagnetic thin film, 2-x technology, applied in the coating and other directions, can solve the problems such as the lack of improvement in the squareness of the hysteresis loop, the low squareness of the hysteresis loop, and the limitation of the application of cobalt ferrite, and the preparation process is achieved. And the effect of easy control of doping amount, excellent ferromagnetic properties, and precise control of chemical composition

Active Publication Date: 2021-09-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 limits the practical application of cobalt ferrite. Research has focused on replacing CoFe 2 o 4 Co in 3+ ions, the squareness of the hysteresis loops does not improve

Method used

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  • a cofe <sub>2-x</sub> la <sub>x</sub> o <sub>4</sub> Ferromagnetic film and preparation method thereof
  • a cofe <sub>2-x</sub> la <sub>x</sub> o <sub>4</sub> Ferromagnetic film and preparation method thereof
  • a cofe <sub>2-x</sub> la <sub>x</sub> o <sub>4</sub> Ferromagnetic 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 CoFe 2‑x La x o 4 Ferromagnetic thin film and its preparation method, x=0.03-0.15. The preparation method includes: step 1, dissolving cobalt nitrate, iron nitrate and lanthanum nitrate in ethylene glycol methyl ether, stirring evenly, adding acetic anhydride, and continuing to stir evenly to obtain a precursor solution; step 2, spin coating the precursor solution on the FTO / glass substrate to obtain a wet film, the wet film is evenly glued and baked at 170-190°C to obtain a dry film, and then annealed in air at 620-640°C to obtain crystalline CoFe 2‑x La x o 4 thin film; step 3, the crystalline CoFe 2‑ x La x o 4 Film cooling, repeat step 2 until reaching the preset thickness, to obtain CoFe 2‑x La x o 4 ferromagnetic film. The present invention La 3+ The doping of ions mainly replaces Fe, improves the squareness of the hysteresis loop, and improves the CoFe 2 o 4 Ferromagnetic properties of the base film.

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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Patent Type & Authority Patents(China)
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