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Heat-assisted magnetic recording medium and magnetic storage device

A recording medium and auxiliary magnetic technology, which is applied in the fields of recording information storage, magnetic recording, data recording, etc., can solve the problems of increasing Curie temperature variance of magnetic particles, decreasing temperature, and decreasing electromagnetic conversion characteristics of thermally assisted magnetic recording media. , to achieve the effect of excellent electromagnetic conversion characteristics

Active Publication Date: 2020-12-18
RESONAC CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, when the magnetic particles are miniaturized, the crystallinity of the magnetic particles decreases, and as a result, the Curie temperature of the magnetic particles decreases, and the variance of the Curie temperatures of the magnetic particles increases.
For this reason, the electromagnetic conversion characteristics of the heat-assisted magnetic recording medium are degraded (for example, refer to Non-Patent Document 1)

Method used

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  • Heat-assisted magnetic recording medium and magnetic storage device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1－1～1－8

[0090] (Examples 1-1 to 1-8 and Comparative Example 1-1)

[0091] Form a Cr-50at%Ti (Cr content is 50at%, Ti content is 50at%) alloy layer (underlayer) with a thickness of 50nm and a Co-20at%Ta-5at%B with a thickness of 25nm on a heat-resistant glass substrate alloy layer (soft magnetic underlayer), which is then heated to 250°C. Next, a Cr layer (underlayer) with a thickness of 10 nm and an MgO layer (underlayer) with a thickness of 10 nm were formed, which were then heated to 520°C. Next, a first magnetic layer with a thickness of 0.5 nm and a second magnetic layer with a thickness of 6.0 nm were formed, and then a carbon layer (protective layer) with a thickness of 3 nm was formed. Finally, a lubricant layer was formed by coating a perfluoropolyether-based lubricant on the protective layer, whereby a heat-assisted magnetic recording medium was obtained.

[0092] Here, the materials constituting the first magnetic layer and the second magnetic layer are shown in Table 1.

...

Embodiment 2－1～2－9

[0101] (Examples 2-1 to 2-9 and Comparative Example 2-1)

[0102] Except that the thickness of the first magnetic layer was changed to 1.0 nm, and the materials constituting the first magnetic layer and the second magnetic layer were changed (see Table 2), compared with Examples 1-1 to 1-8 and In Example 1-1, a heat-assisted magnetic recording medium was obtained in the same manner.

[0103] Table 2 shows the measurement results of the electromagnetic conversion characteristics of the heat-assisted magnetic recording media.

[0104] 【Table 2】

[0105]

[0106] It can be seen from Table 2 that the electromagnetic conversion characteristics of the heat-assisted magnetic recording media of Examples 2-1 to 2-9 are relatively high.

[0107] However, in the heat-assisted magnetic recording media of Comparative Examples 2-1 and 2-2, since the second magnetic layer does not contain ferrite, the electromagnetic conversion characteristics are low.

[0108] Based on the above, it i...

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Abstract

Provided is a heat-assisted magnetic recording medium having a substrate, an underlayer, and a magnetic layer oriented (001), wherein, in the magnetic layer, a first magnetic layer and a second magnetic layer are sequentially aligned from the underlayer side are stacked, the first magnetic layer and the second magnetic layer contain L1 0 structure alloy, the second magnetic layer contains ferrite at the grain boundaries of the magnetic grains, and the ferrite is made of NiFe 2 o 4 , MgFe 2 o 4 , MnFe 2 o 4 、CuFe 2 o 4 , ZnFe 2 o 3 、CoFe 2 o 4 、BaFe 2 o 4 , SrFe 2 o 4 , and Fe 3 o 4 At least one selected from the group consisting of, the Curie temperature of the magnetic particles is lower than the Curie temperature of the ferrite.

Description

technical field [0001] The present invention relates to a thermally assisted magnetic recording medium and a magnetic storage device. Background technique [0002] It is a heat-assisted recording method in which the magnetic recording medium is irradiated with near-field light to locally heat the surface, thereby reducing the coercivity of the magnetic recording medium and performing writing. It is a method that can achieve 1Tbit / inch 2 A recording method with an areal recording density of left and right is attracting attention as a next-generation recording method. When the heat-assisted recording method is used, even a magnetic recording medium with a coercive force of several tens of kOe at room temperature can be easily written by the recording magnetic field of the magnetic head. For this purpose, the magnetic layer can use a magnetocrystalline anisotropy constant Ku of 10 6 J / m 3 In this way, not only can the thermal stability of the magnetic layer be maintained, bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/667G11B5/65
CPCG11B5/667G11B5/672G11B2005/0021G11B5/82
Inventor 张磊福岛隆之徐晨丹羽和也柴田寿人山口健洋神边哲也茂智雄
Owner RESONAC CORPORATION
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