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Perpendicular magnetic recording medium and magnetic recording and reproducing apparatus using the same

一种垂直磁记录、磁记录介质的技术，应用在磁记录、数据记录、记录信息存储等方向，能够解决记录/再现特性降低、有限、增大介质噪音等问题，达到记录分辨率降低抑制、高读取信号质量、高热搅动阻抗的效果

Inactive Publication Date: 2011-06-08
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to increase the thermal agitation resistance of the perpendicular magnetic recording medium, it is effective to increase the magnetic anisotropy energy of the magnetic particles, but in this case the magnetic field necessary for recording is increased
On the other hand, since the recording magnetic field that can be generated from the recording head is limited when the necessary recording magnetic field is increased, recording is difficult when using a recording head that may significantly degrade the recording / reproducing characteristics
In addition, the thermal agitation resistance can also be improved by making the magnetic particles in the magnetic recording layer larger; however, in this case, the fine zigzag shape of the magnetization transition region is usually enlarged to possibly increase the media noise
[0007] As described above, the means for increasing the thermal agitation resistance are generally accompanied by a decrease in recording / reproducing characteristics in a high recording density area

Method used

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  • Perpendicular magnetic recording medium and magnetic recording and reproducing apparatus using the same
  • Perpendicular magnetic recording medium and magnetic recording and reproducing apparatus using the same
  • Perpendicular magnetic recording medium and magnetic recording and reproducing apparatus using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] By the DC sputtering method using an in-line sputtering device, a multilayer thin film was formed on a clean strengthened glass substrate of the magnetic disk. As a multilayer film, first by using AlTi 50 target (the subscript values ​​show here and hereinafter the atomic % of the content of the elements in the alloy) to prepare an AlTi amorphous alloy layer with a thickness of 30 nm. Next, by using FeCo 34 Ta 10 Zr 5 target to prepare the soft magnetic amorphous film to 30nm, to prepare the antiferromagnetic coupling film to 0.5nm by using the Ru target, and again to use the FeCo 34 Ta 10 Zr 5 target to prepare the soft magnetic amorphous thin film with a thickness of 30nm to form a soft magnetic back pad layer 12 with a three-layer stacked structure. The processing gas for each of the above layers during film formation was Ar and the gas pressure was 1 Pa. In addition, sequentially under the Ar pressure of 2Pa by using NiW 8 target to prepare the NiW alloy see...

Embodiment 2

[0145] By utilizing the following with figure 1 Magnetic characteristics and recording / reproducing characteristics were measured in the same manner in the manufacturing steps and evaluation steps to manufacture perpendicular magnetic recording media. However, in Embodiment 2, the magnetic coupling layer 15b is made of CoCr having a thickness of 1.8nm 30 alloy, and the second magnetic layer 15c is made by using CoCr 17 Pt 13 -SiO 2 (8mol%) mixed target preparation. Thereafter, in Example 2, samples were fabricated while setting the sum of the thickness t2 of the second magnetic layer 15c and the thickness t3 of the third magnetic layer 15d constant and varying the ratio of t2. Figure 5A list is given of the composition, saturation magnetization Ms, and thickness of each layer constituting the magnetic recording layer of the produced perpendicular magnetic recording medium.

[0146] Figure 15 is a view showing the relationship between the ratio t2 (t2+t3) of the thicknes...

Embodiment 3

[0153] By utilizing the following with figure 1 Magnetic characteristics and recording / reproducing characteristics were measured in the same manner in the manufacturing steps and evaluation steps to manufacture perpendicular magnetic recording media. However, in Example 3, the magnetic coupling layer 15b is made of CoCr having a thickness of 1.2nm 25 Cr 10 alloy, and the second magnetic layer 15c is made by using CoCr 17 Pt 13 -SiO 2 (8mol%) mixed target preparation. Thereafter, in Embodiment 3, the thickness t2 of the second magnetic layer 15c and the thickness t3 of the third magnetic layer 15d are made the same (t2=t3), and the sum of the thicknesses of the second magnetic layer 15c and the third magnetic layer 15d ( t2+t3) were varied to form samples. Figure 6 A list is given of the composition, saturation magnetization Ms, and thickness of each layer constituting the magnetic recording layer of the produced perpendicular magnetic recording medium.

[0154] Figur...

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Abstract

The present invention provides a perpendicular magnetic recording medium and a magnetic recording and reproducing apparatus using the same. The magnetic recording medium has a substrate and a magnetic recording layer and a protective layer in which the magnetic recording layer includes a first magnetic layer, a magnetic coupling layer, a second magnetic layer and a third magnetic layer, the first magnetic layer is a perpendicular magnetization film containing an oxide and disposed between the substrate and the magnetic coupling layer, the second magnetic layer is a perpendicular magnetization film containing an oxide and ferromagnetically coupled with the first magnetic layer by way of a magnetic coupling layer, the third magnetic layer is a ferromagnetic layer disposed between the second magnetic layer and the protective layer, and the concentration of the oxide contained in the third magnetic layer is lower than the concentration of the oxide in the second recording layer or the third magnetic layer does not contain the oxide, wherein the perpendicular magnetic recording medium may satisfy: 0.1<t2 / (t2+t3)<0.6 or 0.2<(t2+t3) / t1<0.6 for the thickness t1 of the first magnetic layer, the thickness t2 for the second magnetic layer, and the thickness t3 for the third magnetic layer.

Description

technical field [0001] The present invention relates to a perpendicular magnetic recording medium and a perpendicular magnetic recording type magnetic recording and reproducing apparatus using the same. Background technique [0002] Hard disk drives (HDDs) have become indispensable information storage devices in computers and various consumer electronics products, especially in the application of large-capacity information storage. Magnetic recording systems are basically classified into two types of technical methods based on the direction of the magnetization vector in the magnetic recording layer in the magnetic recording medium. One of the methods is longitudinal magnetic recording (LMR) and the other is perpendicular magnetic recording (PMR). In recent years, HDD recording systems have been in transition from longitudinal magnetic recording systems to perpendicular magnetic recording systems. Although the recording density obtained by the longitudinal magnetic recordi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/66G11B5/65G11B5/64
CPCG11B5/82G11B5/66G11B5/65G11B5/672
Inventor 根本广明武隈育子张振刚
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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