Storage medium for heat-assisted magnetic recording and preparation method thereof

A storage medium and auxiliary magnetic technology, which is applied in the direction of metal material coating process, coating, liquid chemical plating, etc., can solve the problems of loss and unsuitability of nickel alloy coating, achieve stable paramagnetic properties, improve crystallization properties, The effect of excellent high temperature resistance

Active Publication Date: 2021-07-13
深圳市优讯佳电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The obtained electroless nickel alloy coating, when the temperature exceeds 400°C, the nickel alloy coating will lose its magnetic properties rapidly, making the electroless nickel alloy plating solution unsuitable for the production of storage media for heat-assisted magnetic recording

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this embodiment, the production method for producing a storage medium for heat-assisted magnetic recording uses an aluminum-magnesium alloy as a substrate, and performs pretreatment on the substrate successively. The pretreatment includes etching, cleaning, galvanizing, secondary zinc immersion, and palladium-precipitating activation steps. , followed by immersion in the electroless nickel alloy solution for nickel alloy plating deposition. Wherein, the electroless nickel alloy plating solution is composed as follows: nickel sulfate 20g / L, copper sulfate 1.0g / L, sodium hypophosphite 20g / L, oxalic acid 6g / L, hydroxymalonic acid 6g / L, ethylenediaminetetraacetic acid 10g / L, the balance is water. The pH of the electroless nickel alloy plating solution is 5, the deposition temperature is 90°C, and the deposition time is 1 hour.

Embodiment 2

[0024] In this embodiment, the production method for producing a storage medium for heat-assisted magnetic recording uses an aluminum-magnesium alloy as a substrate, and performs pretreatment on the substrate successively. The pretreatment includes etching, cleaning, galvanizing, secondary zinc immersion, and palladium-precipitating activation steps. , followed by immersion in the electroless nickel alloy solution for nickel alloy plating deposition. Among them, the composition of the electroless nickel alloy plating solution is as follows: nickel sulfate 20g / L, copper sulfate 1.0g / L, sodium hypophosphite 20g / L, phthalic acid 8g / L, hydroxymalonic acid 8g / L, malonic acid 15g / L, the balance is water. The pH of the electroless nickel alloy plating solution is 5, the deposition temperature is 90°C, and the deposition time is 1 hour.

Embodiment 3

[0026] In this embodiment, the production method for producing a storage medium for heat-assisted magnetic recording uses an aluminum-magnesium alloy as a substrate, and performs pretreatment on the substrate successively. The pretreatment includes etching, cleaning, galvanizing, secondary zinc immersion, and palladium-precipitating activation steps. , followed by immersion in the electroless nickel alloy solution for nickel alloy plating deposition. Among them, the composition of the electroless nickel alloy plating solution is as follows: nickel sulfate 20g / L, copper sulfate 1.0g / L, sodium hypophosphite 20g / L, oxalic acid 10g / L, 2-hydroxysuccinic acid 10g / L, ethylenediaminetetra Acetic acid 20g / L, balance is water. The pH of the electroless nickel alloy plating solution is 5, the deposition temperature is 90°C, and the deposition time is 1 hour.

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Abstract

The invention provides a chemical plating nickel alloy solution. The solution adopts three different organic carboxylic acids for combination, the crystallization property of a chemical plating nickel alloy coating is improved, so that the chemical plating nickel alloy coating has excellent paramagnetic thermal stability. The content of cobalt and copper in the obtained nickel alloy coating can reach 2-3 wt%, the content of phosphorus can reach 12-15 wt%, and the nickel alloy coating has excellent high-temperature resistance, can still keep stable paramagnetic performance and lower magnetic saturation performance after being subjected to heat treatment for more than one hour under the high-temperature condition as high as 450 DEG C, and is particularly suitable for manufacturing the heat-assisted magnetic recording storage medium.

Description

technical field [0001] The invention relates to the electronic industry field where nickel alloy is used to prepare electronic products, in particular to an electroless nickel alloy plating solution and the application of the nickel alloy in the preparation process of a storage medium for heat-assisted magnetic recording. Background technique [0002] In the field of data storage, how to increase the storage capacity of a unit storage medium is still an urgent problem to be solved. From longitudinal magnetic recording technology to perpendicular magnetic recording process, the magnetic part is placed vertically into the layer depth, thus achieving higher storage density. Further increases in data density can only be achieved by reducing the bit size. Regardless of the physical size of the memory cell, a memory cell is defined by a defined number of magnetizable grains that can be used to store data stably. If the grain diameter can be further reduced, more storage cells ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/50
CPCC23C18/50
Inventor 李锐刘亚杨路斌臧月虎
Owner 深圳市优讯佳电子科技有限公司
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