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Material with giant magneto-impedance effect and preparation method thereof

A giant magneto-impedance and effect technology, applied in the field of nano-scale materials and preparation, can solve the problems of inconvenient processing and integration

Inactive Publication Date: 2013-05-29
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used materials with GMI effect in practical use are mainly amorphous ribbons and amorphous wires prepared by thermal quenching and quenching processes, or soft magnetic films prepared by sputtering. However, the thickness of the materials prepared in the prior art have reached the sub-micron or even micron level
Due to the large thickness of existing materials, it brings a lot of inconvenience for processing integration
At present, there are no reports of nanometer-scale materials showing obvious giant magneto-impedance effects below 100 MHz.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0016] The polished aluminum sheet is oxidized once in 0.3mol / L oxalic acid solution with a voltage of 40V, and the oxidation time is 1 hour. Then put the aluminum sheet into a mixed solution of phosphoric acid and chromic acid with a mass ratio of 6% and 1.8%, respectively, in a water bath at 60° C. for 20 minutes, take it out, and wash it with distilled water several times. In order to obtain a template with a more complete structure, the second oxidation was carried out under the same conditions as above, and the oxidation time was 4 hours to obtain a nanopore array with a neat and regular structure and a pore diameter of 50 nm. Since the thickness of the template is directly proportional to the oxidation time, the oxidation time can be properly selected. Gradually reduce the voltage to remove the barrier layer and remove it from the solution. The prepared anodized aluminum template was AC electrodeposited in a 1mol / L CoSO4 solution with a pH value of 4.5 for 10 minutes. ...

Embodiment 2

[0018] The polished aluminum sheet is oxidized once in 34g / L phosphoric acid solution with a voltage of 80V, and the oxidation time is 1 hour. Then put the aluminum sheet into a mixed solution of phosphoric acid and chromic acid with a mass ratio of 6% and 1.8%, respectively, in a water bath at 60° C. for 20 minutes, take it out, and wash it with distilled water several times. In order to obtain a template with a more complete structure, the second oxidation was carried out under the same conditions as above, and the oxidation time was 4 hours to obtain a nanopore array with a neat and regular structure and a pore diameter of 100 nm. Since the thickness of the template is directly proportional to the oxidation time, the oxidation time can be properly selected. Gradually reduce the voltage to remove the barrier layer and remove it from the solution. The prepared anodized aluminum template was AC electrodeposited in a 1mol / L CoSO4 solution with a pH value of 4.5 for 10 minutes....

Embodiment 3

[0020]The polished aluminum sheet was oxidized once in 0.6mol / L sulfuric acid solution with a voltage of 20V, and the oxidation time was 1 hour. Then put the aluminum sheet into a mixed solution of phosphoric acid and chromic acid with a mass ratio of 6% and 1.8%, respectively, in a water bath at 60° C. for 20 minutes, take it out, and wash it with distilled water several times. In order to obtain a template with a more complete structure, the second oxidation was performed under the same conditions as above, and the oxidation time was 4 hours to obtain a nanopore array with a neat and regular structure and a pore diameter of 20 nm. Since the thickness of the template is directly proportional to the oxidation time, the oxidation time can be properly selected. Gradually reduce the voltage to remove the barrier layer and remove it from the solution. The prepared anodized aluminum template was AC electrodeposited in a 1mol / L CoSO4 solution with a pH value of 4.5 for 10 minutes. ...

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Abstract

The invention discloses a nanometer magnitude material capable of generating a remarkable magneto-impedance effect below 100 MHz, and a preparation method thereof. According to the invention, a structure of the material with the giant magneto-impedance effect is that: an insulation layer template with uniform holes is formed on a substrate material, nanowires made of cobalt or iron or cobalt-ironalloy or other magnetic materials are arranged in the holes of the insulation layer template, a layer of iron-nickel alloy film is arranged on the upper surfaces of the insulation layer template and the nanowires, the film and the nanowires form a brush-like structure, the substrate material is a metal material, and the insulation layer template is made of an electrically insulated metal oxide ora high polymer. According to the invention, the substrate metal material used in the material with the giant magneto-impedance effect can be aluminum or titanium, and the insulation template on the substrate metal material can be oxide of aluminum or titanium.

Description

technical field [0001] The present invention relates to a functional material, or / and a material for a magnetic sensor and a preparation method thereof. Specifically, the present invention is a nano-scale material and a preparation method that can exhibit an obvious giant magneto-impedance effect below 100 MHz. Background technique [0002] The giant magneto-impedance effect (GMI) is a characteristic that the AC impedance of the thin film changes dramatically with the external magnetic field when an external magnetic field is applied to a soft magnetic material with high-frequency alternating current. In recent years, with the rapid development of Internet of Things technology, some new, small, high-performance and fast-response magnetic sensor devices are urgently needed in the fields of automotive electronics, robotics, bioengineering, and automatic control to monitor magnetic fields, Speed, rotational speed, displacement, torque, etc. The most widely used magnetic sensor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F10/14H01F41/18
Inventor 王建波张毅刘青芳任勇
Owner LANZHOU UNIVERSITY
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