Exchange bias nickel-base ferromagnetic/antiferromagnetic composite nano fiber and preparation method thereof

A technology of composite nanofibers and nanofibers, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems that do not involve ferromagnetic/antiferromagnetic composite nanofibers, and do not involve how to prepare iron. Magnetic/antiferromagnetic composite nanofibers, etc., to achieve the effects of low cost, increased coercivity, and simple equipment and process

Inactive Publication Date: 2015-01-28
NANJING UNIVERSTIY SUZHOU HIGH TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods and technologies provide the basis for the preparation of magnetic composite nanofibers, but from the public reports, it has not yet involved how to prepare ferromagnetic / antiferromagnetic composite nanofibers, let alone how to prepare ferromagnetic / antiferromagnetic composite nanofibers with exchange bias effects. Antiferromagnetic composite nanofibers await further research and discovery

Method used

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  • Exchange bias nickel-base ferromagnetic/antiferromagnetic composite nano fiber and preparation method thereof
  • Exchange bias nickel-base ferromagnetic/antiferromagnetic composite nano fiber and preparation method thereof
  • Exchange bias nickel-base ferromagnetic/antiferromagnetic composite nano fiber and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1 (calcination at 550°C for 2h in air, reduction at 350°C for 30 minutes in a mixed atmosphere of hydrogen and argon):

[0030] Step 1: 0.80g nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O) Add 8.4g of N,N-dimethylformamide (DMF), stir the nickel salt for about 1 hour to completely dissolve the nickel salt, then add 0.80g of polyvinylpyrrolidone (PVP) with a molecular weight of 1,300,000 , the polymer is fully dissolved by magnetic stirring for about 12 hours, and then left to stand for 2 hours to finally form a uniform and stable sol-state precursor, wherein the concentration of PVP is 8wt%, and the concentration of nickel salt is 8wt%;

[0031] Step 2: Transfer the precursor solution to a 10ml plastic syringe, connect the syringe to a stainless steel needle with an outer diameter of 0.7mm and an inner diameter of 0.4mm with a polytetrafluoroethylene hose, the stainless steel needle is connected to the positive pole of the high voltage power supply, The spinning voltag...

Embodiment 2

[0036] Example 2 (calcination at 600°C for 2h in air, reduction at 350°C for 45 minutes in a mixed atmosphere of hydrogen and argon):

[0037] Step 1 is identical with embodiment 1 step 1;

[0038] Step 2 is identical with embodiment 1 step 2;

[0039] Step 3: Put the precursor fiber into the tube furnace, keep the air atmosphere, first raise the temperature from room temperature to 100°C at a heating rate of 3°C / min and keep it for 30 minutes, then raise the temperature to 600°C at the same heating rate and Keep warm for 2 hours, then cool down to room temperature naturally with the furnace body to obtain nickel oxide fibers;

[0040] Step 4: Place the nickel oxide fiber in a tube furnace, using a mixed atmosphere of hydrogen and argon with a hydrogen volume content of 5%, and ventilate for 30 minutes to ensure that the air in the tube is exhausted, and then at a heating rate of 3°C / min from The nickel oxide fiber is reduced by raising the temperature from room temperature ...

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Abstract

The invention belongs to the field of a magnetic nano material, and discloses a preparation method of an exchange bias nickel-base ferromagnetic / antiferromagnetic composite nano fiber. The method comprises the steps of dissolving nickel salt and high polymer in organic solvent to form uniform and transparent precursor sol; spinning the precursor sol on a high-speed rotating cylindrical receiving device to form well-ordered precursor nano fiber in an electrostatic spinning method; sintering the precursor nano fiber in a tubular furnace under an air atmosphere to form a nickel oxide fiber membrane; reducing the nickel oxide fiber membrane in a tubular furnace in a mixed atmosphere of the hydrogen and argon to obtain Ni / NiO composite nano fiber; and directionally annealing the Ni / NiO composite nano fiber under the protection of argon to obtain the exchange bias nickel-base ferromagnetic / antiferromagnetic composite nano fiber. The exchange bias ferromagnetic / antiferromagnetic composite nano material prepared by adopting the route and the method has advantages of low cost, simple equipment and process and the like.

Description

technical field [0001] The invention belongs to the field of magnetic nanometer materials, and in particular relates to a nickel-based ferromagnetic / antiferromagnetic composite nanofiber with an exchange bias effect and a preparation method thereof. The chemical composition thereof is nickel (Ni) / nickel oxide (NiO). Background technique [0002] After the ferromagnetic / antiferromagnetic composite material is cooled in an external magnetic field from a temperature higher than the antiferromagnetic Neel temperature to a low temperature, the hysteresis loop of the ferromagnetic layer will deviate from the origin along the direction of the magnetic field, and the amount of deviation is called the exchange bias field. , this phenomenon is called exchange bias. The exchange bias of ferromagnetic / antiferromagnetic composite materials plays a very important role in the realization of giant magnetoresistive devices, and has been applied in high-density magnetic recording and other fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08D01F11/00D01D5/00H01F1/12B82Y30/00B82Y40/00
Inventor 陈平肖超
Owner NANJING UNIVERSTIY SUZHOU HIGH TECH INST
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