Magnetic recording medium based on FePt magnetic layer and producing method thereof

A technology of magnetic recording medium and magnetic layer, which is applied in the field of information storage and can solve problems such as the increase of annealing temperature

Inactive Publication Date: 2008-02-13
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the requirements of the effective thickness of the magnetic layer of the ultra-high-density magnetic recording medium, the selection of the thickness of the FePt layer should be around 10nm or even below, and for FePt films below 10nm and below 10nm, even if the above method is used, the annealing temperature is also low. will greatly increase

Method used

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  • Magnetic recording medium based on FePt magnetic layer and producing method thereof
  • Magnetic recording medium based on FePt magnetic layer and producing method thereof
  • Magnetic recording medium based on FePt magnetic layer and producing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The structure of the magnetic recording medium based on the FePt magnetic layer is: substrate glass 1, the AuCu buffer layer 2 with a thickness of 10nm, the FePt magnetic layer 3 with a thickness of 9nm, and the protective layer 4 (material is C) with a thickness of 5nm, all The thickness or composition of each layer is the value when the sample was vacuum deposited or before annealing. Figure 2 shows the hysteresis loops measured with a vibrating sample magnetometer and a superconducting quantum magnetometer after the product has undergone vacuum annealing at temperatures of 350°C and 400°C for 1 hour. Figure 3 shows the dependence of the coercivity of this product on the annealing temperature.

Embodiment 2

[0024] The structure of the magnetic recording medium based on the FePt magnetic layer is: a substrate glass 1, an AuCu buffer layer 2 with a thickness of 1nm to 50nm, a FePt magnetic layer 3 with a thickness of 9nm, and a protective layer 4 with a thickness of 5nm (the material is C) , all thicknesses or compositions of the individual layers are the values ​​when the samples were vacuum deposited or before annealing. Figure 4 shows the dependence of the coercivity of this product on the thickness of the buffer layer after vacuum annealing at 350°C and 400°C for 1 hour.

Embodiment 3

[0026] The structure of the magnetic recording medium based on the FePt magnetic layer is: a substrate glass 1, an AuCu buffer layer 2 with a thickness of 10nm, a FePt magnetic layer 3 with a thickness of 2nm to 50nm, and a 5nm protective layer 4 (material is C), All thicknesses or compositions of individual layers are at the time of vacuum deposition of the samples or before annealing. Figure 5 shows the dependence of the coercivity of this product on the thickness of the magnetic layer after vacuum annealing at 350°C and 400°C for 1 hour.

[0027] The preparation method of the magnetic recording medium based on FePt magnetic layer of the present invention is described below with embodiment 1:

[0028] First adopt vacuum deposition method, such as magnetron sputtering method, the background vacuum degree is better than 10 -5 Pa, and the deposition working pressure under inert atmosphere is 5×10 -1 Pa to 6×10 -1 Pa, a buffer layer AuCu, a magnetic layer FePt, and a protecti...

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Abstract

A magnetic recording media based on FePt magnetic layer consists of substrate, FePt magnetic layer, protective layer and AuCu buffer layer set between the substrate and the FePt magnetic layer. It is prepared as applying FePt alloy of equiatomic ratio or near to equiatomic ratio as magnetic layer of magnetic recording media to achieve high density recording, adding a special buffer layer to reduce ordering temperature and coating a protective layer to protect the magnetic layer.

Description

technical field [0001] The invention relates to a magnetic recording medium based on an FePt magnetic layer and a preparation method thereof, belonging to the field of information storage. Background technique [0002] In recent years, due to the sharp increase in the amount of information, high-density recording has become a hot spot of concern, and the development of magnetic recording has become a top priority due to its large storage capacity, countless times of repeated erasing, and stable information. At present, the mainstream material for magnetic recording is CoPtCrB, but its magnetocrystalline anisotropy energy K u only about 10 -1 J / cm 3 , and its further development is limited by the superparamagnetic limit. In the later study, an extremely thin Ru layer of about 0.9nm was inserted into two layers of CoPtCrB to form the medium of antiferromagnetic coupling AFC, and the M r t(M r is the residual magnetization, t is the thickness of the magnetic layer) value, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/66G11B5/84
Inventor 竺云蔡建旺
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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