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

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...

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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 / soft magnetic double-layer or multi-layer films by sputtering or epitaxy, including NdFeB / Fe, SmCo / Fe, FePt / Fe, etc. The required equipment is usually relatively expensive, and The prepared material is only nanometer in one dimension, which is not conducive to the miniaturization requirements of future devices. The current trend of device miniaturization also puts forward higher requirements for permanent magnet materials to move towards smaller scales.

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