Method of manufacturing nano-strontium ferrite film
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A ferrite thin film and nano-strontium technology, which is applied in the field of preparing nano-strontium ferrite precursors to achieve the effects of uniform grain size distribution and excellent electromagnetic properties
Inactive Publication Date: 2009-02-18
NORTHWESTERN POLYTECHNICAL UNIV
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There is no report on the preparation of nano-strontium ferrite thin film and its electromagnetic parameters by sol-gel method
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Embodiment 1
[0023] Table 1 Formula for preparing nano-strontium ferrite film sol
[0024]
[0025] 1. Prepare nano-strontium ferrite film, and weigh the medicine according to the ratio in Table 1;
[0026] 2. Put 17.9g of citric acid into beaker A, put in distilled water, add 200ml of distilled water to make the solution viscosity 2-4mPa·s, stir until completely dissolved;
[0027] 3. Put 15.3g of the main salt, ferric nitrate, into beaker B, add 200ml of distilled water to make the solution viscosity 2-4mPa·s, and stir until completely dissolved;
[0028] 4. Add 1g of strontium nitrate as the main salt into beaker A and stir until completely dissolved;
[0029] 5. Add the solution in beaker B to beaker A, stir for half an hour and slowly add 14.2ml of ethylene glycol, continue stirring and heating to control the temperature between 70°C, and slowly evaporate to obtain a sol;
[0030] 6. Soak the silica substrate in the sol, and apply the dipping-pulling method to coat the film. Lif...
Embodiment 2
[0035] 1. Prepare nano-strontium ferrite film, and weigh the medicine according to the ratio in Table 1;
[0036] 2. Put 17.9g of citric acid into beaker A, put in distilled water, add 200ml of distilled water to make the solution viscosity 2-4mPa·s, stir until completely dissolved;
[0037] 3. Put 15.3g of the main salt, ferric nitrate, into beaker B, add 200ml of distilled water to make the solution viscosity 2-4mPa·s, and stir until completely dissolved;
[0038] 4. Add 1g of strontium nitrate as the main salt into beaker A and stir until completely dissolved;
[0039] 5. Add the solution in beaker B to beaker A, stir for half an hour and slowly add 14.2ml of ethylene glycol, continue stirring and heating to control the temperature between 80°C, and slowly evaporate to obtain a sol with a suitable viscosity;
[0040] 6. Soak the silica substrate in the sol, and apply the dipping-pulling method to coat the film. Pull up the liquid surface vertically at a rate of 2.5mm / s to...
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Abstract
The invention relates to a preparation method of a nanometer strontium ferrite thin film, which is characterized in that the invention is made through the following steps: iron nitrate, strontium nitrate, and the like, mainly serve as raw materials to prepare a forerunner body of the nanometer strontium ferrite in a sol-gel method; clean silicon dioxide serves as a support base, the iron nitrate and the strontium nitrate salt, citric acid serves as complexing agent, glycol serves as complexing agent assist, the silicon dioxide support base is arranged in the forerunner body, namely is soaked in the sol, and a soakage-drawing method is adopted to make the film. The preparation method of a nanometer strontium ferrite thin film has the characteristics that firstly, the sol-gel method is adopted to prepare, and the nanometer thin film with high purity is obtained through optimizing preparation technology, and basic components of the nanometer strontium ferrite thin film can be seen in a table 2; secondly, the grain size of the nanometer strontium ferrite thin film is 40mm to 60mm, the grain size is evenly distributed, and the thin film surface is compact and is composed of bar-shaped crystal particles which are stacked; thirdly, the electromagnetic performance of the nanometer strontium ferrite thin film is good.
Description
technical field [0001] The invention relates to a method for preparing a nano-strontium ferrite film, which mainly uses ferric nitrate, strontium nitrate, etc. as raw materials to prepare the precursor of nano-strontium ferrite by using a sol-gel method; Iron nitrate and strontium nitrate are the main salts, citric acid is the complexing agent, and ethylene glycol is the auxiliary complexing agent. The silicon dioxide substrate is soaked in the precursor-sol, and the process is carried out by dipping-pulling method. Film making. Background technique [0002] Strontium ferrite is a traditional permanent magnet material, which has been widely used in microwave, magneto-optic, high-density magnetic recording media, etc. The wave performance is poor; while the currently used Co-based alloy film covering the 10-15nm amorphous carbon (diamond-like) protective film has the disadvantages of a large distance between the magnetic head and the recording medium and low magnetocrystalli...
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