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Preparation method of one-dimensional magnetic nanowire array with ultrahigh axial remanence ratio

A magnetic nanometer and remanence ratio technology, applied in nanotechnology, chemical instruments and methods, single crystal growth, etc., can solve the problems of low magnetic parameters and can not meet the needs of practical applications, and achieve good universality.

Inactive Publication Date: 2016-02-03
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

[0020] The invention solves the problem that the magnetic parameters such as coercive force and remanence ratio are too low to meet the needs of practical applications in the process of preparing nanowire arrays by direct current electrodeposition of the template method, and proposes high overpotential growth with ultra-high axial remanence ratio Fabrication method of one-dimensional nanowire array

Method used

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  • Preparation method of one-dimensional magnetic nanowire array with ultrahigh axial remanence ratio
  • Preparation method of one-dimensional magnetic nanowire array with ultrahigh axial remanence ratio
  • Preparation method of one-dimensional magnetic nanowire array with ultrahigh axial remanence ratio

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Embodiment 1

[0054] Embodiment 1 takes the alumina template as an example, and the preparation process of the alumina template includes the following steps:

[0055] a1. The first anodic oxidation: the degreasing and polished aluminum sheet is used as the anode, copper is used as the cathode, the electrolyte is phosphoric acid, the temperature is kept at 0°C, the voltage between the electrodes is 40V, and the anodization is performed for 12 hours. Alumina layer.

[0056] a2. Removing the alumina layer for the first time: use a mixed solution of 15wt% chromic acid and 10wt% phosphoric acid in a volume ratio of 1:5 to remove the generated alumina layer and wash it.

[0057] a3. The second anodic oxidation: the aluminum sheet after removing the alumina layer in step a2 is used as the anode, and the copper is used as the cathode, and the second anodic oxidation is carried out. Anodize for 2 hours.

[0058] After the second anodization, a uniformly distributed alumina channel array is formed ...

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Abstract

The invention discloses a preparation method of a one-dimensional magnetic nanowire array with an ultrahigh axial remanence ratio. An alumina template with uniformly-distributed through holes is prepared by using a two-time anodic oxidation method, and then, direct-current electrodeposition is carried out to prepare the magnetic nanowire array. In the electrodeposition process, a layer of silver as a cathode is sputtered on one side of the alumina template, a metal to be plated is used as an anode and placed in a plating tank, and a metal salt solution to be plated, contained in the plating tank, is used as a plating solution. A set voltage is added between the cathode and the anode, the current in a circuit is controlled at a constant value, then electrodeposition is carried out, and the deposition time is set according to the length of a required nanowire, thus the nanowire array growing in a template hole is obtained. By using the method, the nanowire array with an ultrahigh axial remanence ratio can be prepared, and meanwhile, good controllability can be achieved in the deposition process.

Description

technical field [0001] The invention belongs to the technical field of magnetic one-dimensional nanowire arrays, in particular to a preparation method of a one-dimensional magnetic nanowire array with ultra-high axial remanence ratio. Background technique [0002] Magnetic nanowire arrays have potential applications in discrete media perpendicular magnetic recording, magnetic nanodevices, magneto-optical devices, and microwave devices. Most of these applications require nanowire arrays to have a high axial remanence ratio. However, the axial remanence ratio of magnetic nanowire arrays reported so far is not high. There are many methods for preparing magnetic one-dimensional nanowire arrays, such as photolithography, self-assembly, and template methods. [0003] Template method can be divided into alumina template, crystal step, polymer template, biomolecule template and so on according to the different templates. [0004] Photolithography can obtain regular arrays, but pho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B7/12C30B29/62C30B29/02B82Y40/00
Inventor 田丰陈宏斌蹇敦亮刘毅
Owner UNIV OF SHANGHAI FOR SCI & TECH
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