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Method for preparing spinel ferrite film

A spinel ferrite and thin film technology is applied in the field of preparation of spinel ferrite thin films, can solve problems such as limiting wide application, increasing reaction cost, long sintering time, etc., and achieves simplified steps, reduced reaction time and Cost and effect of short sintering time

Inactive Publication Date: 2014-09-10
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the sintering time is long, which easily leads to cracking of the film, and oxygen needs to be continuously introduced during sintering, which increases the reaction cost, which limits the wide application of this method

Method used

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  • Method for preparing spinel ferrite film
  • Method for preparing spinel ferrite film
  • Method for preparing spinel ferrite film

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A cobalt ferrite CoFe 2 o 4 The preparation method of thin film, comprises the following steps:

[0022] Step 1: Prepare 50ml of electrolyte solution, in which CoSO 4 ·7H 2 The concentration of O is 0.025mol / L, FeSO 4 ·7H 2 The concentration of O is 0.05mol / L, then add H 2 SO 4 Adjust the pH to 4; use the Si-Pt sheet as the working electrode, the saturated calomel electrode as the reference electrode, and the platinum sheet as the counter electrode, and use the constant voltage method to electroplate at -2.1V for 3 minutes to obtain a cobalt-iron alloy film CoFe 2 ;

[0023] Step 2: Use the three-electrode method to carry out anodic activation treatment on the alloy film: prepare 50mL of 1.5mol / L NaOH solution as the electrolyte, use the cobalt-iron alloy film obtained in step 1 as the working electrode, and the saturated calomel electrode as the reference electrode, platinum The sheet is the counter electrode, at the current density J=-90mA / cm 2 Under constant...

Embodiment 2

[0027] The difference between this embodiment and embodiment 1 is that when the anode activation treatment is carried out in step 2, the current density J=-110mA / cm 2 .

[0028] image 3 (b) is the CoFe that embodiment 2 obtains 2 o 4 The hysteresis loop of the film, given by image 3 (b) It can be seen that the coercive force of the film is about 2.5kOe, and the saturation magnetization perpendicular to the film surface is 110emu / cm 3 .

Embodiment 3

[0030] The difference between this embodiment and embodiment 1 is that when the anodic activation treatment is carried out in step 2, the current density J= - 130mA / cm 2 .

[0031] image 3 (c) is the CoFe that embodiment 3 obtains 2 o 4 The hysteresis loop of the film, given by image 3(c) It can be seen that the coercive force of the film is about 2.5kOe, and the saturation magnetization perpendicular to the film surface is 150emu / cm 3 .

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Abstract

The invention provides a method for preparing a spinel ferrite and belongs to the technical field of films. The method comprises the following steps: preparing an alloy film by adopting an electrochemical deposition method, carrying out anode activation on the alloy film in an alkaline solution by adopting a galvanostatic method; and finally sintering to obtain the spinel ferrite film. The spinel ferrite film prepared by adopting the method requires short sintering time, oxygen is not needed in sintering, the film is of a cylindrical structure, has high saturated magnetic strength in the direction vertical to the film, and has a better magnetic performance.

Description

technical field [0001] The invention belongs to the technical field of thin films, and in particular relates to a preparation method of a spinel ferrite thin film. Background technique [0002] Ferrite is a new type of non-metallic magnetic material developed rapidly in the 1940s. Compared with metal magnetic materials, ferrite has the advantages of large resistivity, high dielectric properties, and high magnetic permeability at high frequencies, and has been widely used. Among them, the most widely used is the spinel ferrite material, and its chemical formula can be MFe 2 o 4 In the formula, M represents divalent metal ions such as manganese, nickel, zinc, copper, and cobalt. With the development of science and technology, ferrite is not only widely used in communication broadcasting, automatic control, computing technology and instrumentation, but also in space navigation, satellite communication, information display and pollution treatment. space. [0003] In the pro...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622C25D5/48
Inventor 何泓材钱能王宁王兵王逞
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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