A multiphase composite magnetic nanowire array and its preparation method

A nanowire array and composite magnetic technology, which is applied in the field of preparation of magnetic nanowire arrays, can solve the problems of pollution and poor structural stability in the preparation process, and achieve excellent magnetic anisotropy, high aspect ratio, and improved deposition rate. Effect

Active Publication Date: 2017-04-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many studies on single-phase nanowires obtained by a single preparation process, but the research on multi-phase composite nanowire arrays, especially the reports on multi-phase composite nanowires of iron group elements and rare earth elements are rarely seen in domestic and foreign journals. arrive
The Chinese invention patent with the publication number CN103128305A discloses a method for preparing Ag / Co magnetic nanocomposites, using Ag nanowires as the substrate template and Co salt as the precursor to obtain a one-dimensional Ag / Co magnetic nanocomposite by a two-step synthesis method. Composite nanowires, whose preparation process is polluted and has poor structural stability

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  • A multiphase composite magnetic nanowire array and its preparation method
  • A multiphase composite magnetic nanowire array and its preparation method
  • A multiphase composite magnetic nanowire array and its preparation method

Examples

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Effect test

Embodiment 1

[0027] Preparation of AAO template and electrode pretreatment

[0028] Cut the annealed aluminum foil into a disc with a diameter of 2 cm and flatten it, then place it in acetone and absolute ethanol in sequence, and use an ultrasonic cleaner to vibrate and clean it for 5 minutes respectively, and use deionized water to wash the degreased aluminum foil repeatedly. Rinse well, and then soak in 10%wt NaOH solution for 15 minutes to remove the oxide layer on the surface of the aluminum foil. Then put it under the tap and rinse it with clean water for 20 minutes, and finally rinse it with deionized water. The electrochemical method is used for polishing, and the electrolyte is prepared by using absolute ethanol and perchloric acid in a volume ratio of 4:1. Finally, a template with uniform pore size is obtained through two oxidation processes. The gold-sprayed AAO template on the back is bonded to the Cu sheet with conductive adhesive to form a composite electrode, which is conne...

Embodiment 2

[0032] First prepare the Fe-Co electroplating solution and the Sm-Co electroplating solution respectively, wherein the composition of the Fe-Co electroplating solution is 0.2mol / L CoSO 4 ·7H 2 O, 0.15mol / L FeSO 4 ·7H 2 O, 0.7mol / L Na 2 SO 4 , 0.05mol / L of ascorbic acid and 0.4mol / L of H 3 BO 3 . The composition of Sm-Co electroplating solution is 0.2mol / L SmCl 3 With 0.05mol / L CoCl 2 And the additive components are 0.1mol / L boric acid, 0.12mol / L ascorbic acid and 0.16mol / L glycine. Place the pre-treated electrode connection circuit in the plating tank and place it on a magnetic stirrer to start the alternating deposition. First deposit the Fe-Co alloy for 80s, then quickly pour out the Fe-Co plating solution, rinse the electrolytic tank with deionized water, pour the Sm-Co plating solution into the deposition for 30s, and then replace the Sm-Co plating solution with Fe- The Co plating solution was deposited for 60 s and then cycled 30 times. When depositing Fe-Co, t...

Embodiment 3

[0034] Prepare the Fe-Co and Sm-Co electroplating solutions respectively, in which the composition of the Fe-Co plating solution is 0.2mol / L CoSO 4 ·7H 2 O, 0.15mol / L FeSO 4 ·7H 2 O, 0.7mol / L Na 2 SO 4 , 0.05mol / L of ascorbic acid and 0.4mol / L of H 3 BO 3 . The composition of Sm-Co electroplating solution is 0.2mol / L SmCl 3 With 0.05mol / L CoCl 2 And the additive components are 0.1mol / L boric acid, 0.12mol / L ascorbic acid and 0.16mol / L glycine. Place the pre-treated electrode connection circuit in the plating tank and place it on a magnetic stirrer to start the alternating deposition. First deposit the Fe-Co alloy for 80s, then quickly pour out the Fe-Co plating solution, rinse the electrolytic tank with deionized water, pour the Sm-Co plating solution into the deposition for 30s, and then replace the Sm-Co plating solution with Fe- The Co plating solution was deposited for 60 s and then cycled 30 times. When depositing Fe-Co, the temperature of the electroplating so...

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Abstract

The present invention relates to a multi-phase composite magnetic nano-wire array and a preparation method thereof. According to the preparation method, an electric conduction glue for an AAO template with a gold-sprayed back surface and a Cu sheet are adhered to form a composite cathode, graphite with a smooth and clean surface is adopted as an anode, electrochemical deposition is alternately performed in a Fe-Co electroplating solution and a Sm-Co electroplating solution after the cathode and the anode are connected to a power supply so as to form nano-wires on the template, and the nano-wires in the template are subjected to annealing crystallization so as to obtain the multi-phase composite magnetic nano-wire array . Compared with the multi-phase composite magnetic nano-wire array in the prior art, the multi-phase composite magnetic nano-wire array prepared by the method of the present invention has characteristics of high length-diameter ratio, large coercive force and excellent magnetic anisotropy, can be used for high-density perpendicular magnetic recording medium, and is further a sensor element and electromagnetic device material having wide prospects.

Description

technical field [0001] The invention relates to a preparation method of a magnetic nanowire array, in particular to an electrodeposition preparation method of a multiphase composite magnetic nanowire. Background technique [0002] In recent decades, with the rapid development of information technology, electronic components, as the material carrier of information, are gradually developing in the direction of miniaturization and densification. At the same time, the storage device needs to continuously increase the storage space, and is required to have the characteristics of low energy consumption and high efficiency. These undoubtedly increase the requirements for high-performance storage magnetic materials. One-dimensional magnetic nanowires have very broad application prospects in ultra-high-density vertical storage and sensors due to their high magnetic anisotropy, high magnetic susceptibility, high coercive force, low saturation magnetic moment, and low magnetic loss. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/10C25D3/56B82Y25/00B82Y40/00
Inventor 陆伟牛俊超夏卡达
Owner TONGJI UNIV
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