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Method for improving L10-Fept thin film performance with surface activating agent

A surfactant, L10-fept technology, applied in the direction of coating with magnetic layer, cathode sputtering application, sputtering coating, etc., to achieve small surface free energy, reduce ordering temperature, and improve ordering degree of effect

Inactive Publication Date: 2007-05-23
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0004] The object of the present invention is to provide a surfactant to improve L1 0 - The method of FePt thin film performance, which solves the problem of industrial production of FePt alloy

Method used

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  • Method for improving L10-Fept thin film performance with surface activating agent

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Embodiment Construction

[0011] The film was prepared in a magnetron sputtering apparatus. First, the glass substrate is ultrasonically cleaned with organic chemical solvents, deionized water and alcohol, and then mounted on the sample base of the sputtering chamber. The substrate is kept at room temperature. Sputtering chamber background vacuum 3×10 -5 Pa, under the condition of argon gas (purity 99.99%) pressure 0.45 Pa during sputtering, bismuth Bi (200 ) and iron platinum FePt (200 ) are deposited sequentially to prepare Bi (200 ) / FePt (200 ) thin film , Deposit Bi (400 ) and FePt (300 ) to prepare Bi (400 ) / FePt (300 ) thin film. The sample after sputtering is quickly in the vacuum degree of 2×10 -5 Heat treatment in Pa vacuum annealing furnace. It can be seen from Figure 1 that the FePt film without a Bi layer has a higher coercivity (6.8kOe) after annealing at 400°C, while Bi(200) / FePt(200) and Bi(400) / FePt(300) film, the coercivity values ​​reached 10.4kOe and 5.3kOe respectively afte...

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Abstract

The method for improving LIo-FePt film performance by utilizing surface activating agent is characterized by that in a magnetically-controlled sputter successively depositing Bi and FePt on a cleaned glass baseplate, the background vacuum degree of sputtering chamber is 1X10 to the power-5-7X10 to the power-5Pa, the argon pressure is 0.4-0.6Pa, the baseplate is retained at room temperature, and the background vacuum degree in the course of annealing is 2X10 to the power-5-7X10 to the power-5Pa.

Description

Technical field [0001] The invention belongs to the technical field of high-density magnetic recording materials, and in particular provides a surface active agent to improve L1 0 -FePt film performance method. Background technique [0002] In the past ten years, information storage technology, especially magnetic recording technology, has been rapidly developed, especially the application of giant magnetoresistance spin valve heads, which greatly increases the areal recording density of hard disks. At present, the longitudinal magnetic recording area density in the laboratory has reached 150Gb / in 2 (S. Mao et al. IEEE Tran. Magn. 40, 307 (2004)). To further increase the recording density, the size of magnetic recording single domain particles must be reduced. When the magnetic recording area density reaches 1Tb / in 2 At this time, the grain size should be less than 5nm. At this time, due to the need for thermal stability, the magnetic recording material must have higher magnetocr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/851H01F41/18
Inventor 于广华冯春腾蛟李宝河
Owner UNIV OF SCI & TECH BEIJING
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