Hard magnetic linear nano coaxial cable wrapped by soft magnetic tube and preparation method thereof

A coaxial cable, nanotechnology, applied in the fields of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of unfavorable device miniaturization, expensive equipment, low maximum magnetic energy product, etc.

Inactive Publication Date: 2010-03-10
CENT IRON & STEEL RES INST
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Problems solved by technology

However, the maximum magnetic energy product of the nano-exchange-coupled permanent magnets obtained in the experiment is much lower than the theoretical expectation. Therefore, the development of new preparation technologies and the preparation of nano-exchange-coupled materials by artificial synthesis are the key to increasing the maximum magnetic energy product.
The artificial composite structure currently prepared is mainly to prepare hard/so...

Method used

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  • Hard magnetic linear nano coaxial cable wrapped by soft magnetic tube and preparation method thereof
  • Hard magnetic linear nano coaxial cable wrapped by soft magnetic tube and preparation method thereof

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Embodiment

[0017] The high-purity aluminum sheet was annealed in vacuum at 400°C for 4 hours. The annealed aluminum sheet was placed in absolute ethanol for 1 minute and then placed in 0.3 mol / L NaOH for 3 minutes, washed with deionized water, and dried. Put the treated aluminum sheet into a mixture of absolute ethanol and perchloric acid (4:1) and conduct electropolishing for 1.5 minutes with a current of 1A. Take out the aluminum piece and wash it, put it into 0.3mol / L H 3 PO 4 Electrochemical oxidation is carried out in the solution, the oxidation voltage is 120V, and the oxidation time is 3 hours to obtain a porous alumina template. Immerse the alumina template into the prepared saturated solution of ferric nitrate and cobalt nitrate (molar ratio 7:3) for about 30 minutes, take out the template and put it into an oven, and dry it at 60°C. Calcined at 350°C for 3 hours in a tube furnace. Repeat soaking, drying, and calcination process three times. The prepared sample was reduced ...

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Abstract

The invention relates to a hard magnetic linear nano coaxial cable wrapped by a soft magnetic tube and a preparation method thereof, belonging to the technical field of nana materials preparation. Thecoaxial cable is in a double-layer coaxial composite structure and comprises an internal linear nano magnetic core and an external tubular material, wherein the internal linear magnetic core consistsof FePt, CoPt or FeCoPt one-dimensional hard magnetic phase nano wire which is externally wrapped by Fe, Co Ni metal or alloy soft magnetic nano tube to form a FeCoNi/FeCoPt interchange spring nano coaxial cable. The preparation method comprises the following steps: firstly, preparing a soft magnetic alloy nano tube in a porous anode alumina template by adopting a template wetting method; and secondly, growing the nano wire in the nano tube by adopting an electrochemical deposition method. The invention has the advantages that the nano permanent magnet material in the true sense is obtained,and the preparation method is simple.

Description

technical field [0001] The invention belongs to the technical field of nanometer material preparation, and in particular provides a soft magnetic tube-coated hard magnetic wire type nano coaxial cable and a preparation method thereof, which are suitable for the preparation of soft / hard magnetic exchange spring nano coaxial cables. Background technique [0002] One of the main uses of exchange springs is to manufacture high-performance permanent magnet materials. In 1991, E.F.Kneller et al. proposed a new principle for preparing permanent magnet materials. When nanoscale soft magnetic materials and hard magnetic materials form composite materials, it will produce The exchange coupling effect promotes the remanence enhancement effect and produces a high magnetic energy product. This nano-exchange-coupled permanent magnet is considered to be an important way to develop the fourth-generation permanent magnet. Permanent magnets require as large a coercive force and saturation ma...

Claims

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Application Information

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IPC IPC(8): H01F1/01H01F1/047H01F1/147B82B1/00B82B3/00
Inventor 周栋李卫朱明刚方以坤赵睿
Owner CENT IRON & STEEL RES INST
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