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Method for preparing magnetic thin film

A magnetic film and magnetic technology, applied in the direction of magnetic film, the application of magnetic film to substrate, magnetic objects, etc., can solve the problems of limited application of characteristics, and achieve the effect of increasing controllability and rich film forming methods

Inactive Publication Date: 2011-06-22
SUNDIA MEDITECH COMPANY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation conditions of these methods are relatively high, and because the films are deposited on hard substrates such as silicon and metal, the application of magnetic films or magnetic nano films is limited, especially in other fields outside the electronics industry such as optics. Aspects of feature applications are subject to certain restrictions

Method used

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  • Method for preparing magnetic thin film

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1: According to the patent (200410051573.3), lipophilic magnetic nanoparticles modified with oleic acid were prepared.

[0030] 0.2mol / LFeCl 2 and 0.4mol / LFeCl 3 Mix with concentrated ammonia water, react for 1 hour, add 200 times the amount of water at 10°C, and stir at 10,000 rpm for 2.5 hours; separate the prepared Fe 3 o 4 Nanoparticles, washed twice with pure water, adding pH8.4 aqueous solution under stirring at 40000rpm, then mixing with 2.5 times the calculated amount of sodium oleate under stirring at 40000rpm, heating and reacting at 85°C for 20 minutes, cooling to 25°C, Adjust the pH to 5.2, separate the precipitated magnetic nanoparticles by magnet adsorption method, wash the precipitate once with acidic water with pH 4.2, wash with pure water three times, and then dry to obtain oleic acid-modified lipophilic magnetic nanoparticles.

Embodiment 2

[0031] Example 2: Silica-coated core-shell magnetic nanoparticles were prepared according to the patented technology (200810034073.7).

[0032] 0.2mol / L FeCl 2 and 0.4mol / L FeCl 3 Mix with 2mol / L NaOH, react for 25 minutes, add 100 times the amount of water at 15°C, stir at 10000rpm for 1 hour, the crystallization reaction of the particles is completed; separate the crystal particles by applying a magnetic field through the magnetic adsorption method, and wash with distilled water After cleaning, Fe with a particle size of 2-12nm can be obtained 3 o 4 Nanoparticles. Take 3.5 grams of Fe 3 o 4 Nanoparticles are dispersed in a mixed solvent consisting of 1000ml of isopropanol, 20ml of water, and 40ml of concentrated ammonia water with a concentration of 25% to 28% by mass. At room temperature, 0.6mol / L ethyl orthosilicate is added dropwise at a stirring speed of 800rpm. The ester was reacted for 20 hours, and the black solid was separated with a 0.1T permanent magnet, and th...

Embodiment 3

[0033] Embodiment 3: the preparation of magnetic film

[0034] According to the patent (200410051573.3), the lipophilic magnetic nanoparticles modified by oleic acid were obtained (see Example 1)

[0035] Weigh 1g of oleic acid-modified magnetic nanoparticles and disperse them in 10ml of benzene, sonicate for 15min to obtain a benzene dispersion (dispersion A) of 1% (w / v) magnetic nanoparticles; weigh 5g of polystyrene and dissolve in benzene solution In 25ml, 20% (w / v) polystyrene benzene dispersion (dispersion B) was obtained; dispersion A and dispersion B were stirred and mixed to obtain a film-forming precursor, and the film-forming precursor was dropped into a film mold , seal the mold feeding port, place the mold after feeding in the magnetic field of an EM5 electromagnet, the magnetic field air gap is 50mm, the input current is 15A, and the magnetic field induction intensity at the center of the mold is measured to be 0.1T (Tesla); Under the environment, with the volat...

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Abstract

The invention provides a method for preparing a magnetic thin film. The method comprises the steps of preparing a magnetic filler, preparing a magnetic film forming matter matrix, forming a film and applying a magnetic field. In the method, the technology that magnetic nano or micron material fillers in such film forming matters as resins, rubbers, plastics, coatings and other high polymers are directionally and orderly arranged under the action of the external magnetic field is adopted, and the bearing media of the magnetic thin film or magnetic nano thin film are expanded under the premise of maintaining the anisotropy characteristic of the magnetic nanocrystals, thus expanding the application field of the bearing media. The method has the following advantages: the bearing media of the magnetic nanocrystals can be resins, rubbers, plastics, coatings, other high polymers and other flexible media rather than to be only limited to hard substrates; besides the precipitation method and the self-assembly method, the film forming methods also include a drawing method, a blowing method, a calendering method, a diffusion method and the like; and the stepwise synthesis process is adopted, thus improving the controllability of the synthesized product and being beneficial to industrial production.

Description

technical field [0001] The invention relates to magnetic materials, in particular to a method for preparing a magnetic film, in particular to a method for preparing a magnetic nano film. Background technique [0002] Magnetic thin film has been widely used in the field of electronics industry, it can promote the high frequency, miniaturization and planarization of magnetic devices, such as various magnetic devices made of magnetic thin film, including thin film magnetic recording medium, thin film magnetic head, thin film transformer , Thin film inductors, thin film noise suppressors, planar thin film resistors, capacitors, etc. [0003] Magnetic nano film refers to a film composed of magnetic nano-scale particles (grains) or a single-layer or multi-layer film with a layer thickness of nano-scale. Compared with ordinary magnetic films, magnetic nano films have many unique properties, such as giant conductance, giant magnetoresistance effect, giant Hall effect, etc. Due to ...

Claims

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Application Information

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IPC IPC(8): H01F10/00H01F10/28H01F41/14H01F41/22
Inventor 盛蓉生曾献生王晓川
Owner SUNDIA MEDITECH COMPANY LTD
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