Exchange-coupling composite magnetic recording medium and manufacturing method thereof

A magnetic recording medium and exchange coupling technology, applied in the field of magnetic storage, can solve the problems of weakening magnetic field, increasing distance between magnetic head and recording medium, etc.

Inactive Publication Date: 2017-09-01
FUDAN UNIV
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Problems solved by technology

[0013] The purpose of the present invention is to provide a new type of exchange-coupled composite magnetic recording medium to solve the problem of magnetic field weakening caused by the increase of the distance between the magnetic head and the recording medium in the magnetic recording technology, and to meet the needs of high-density hard disks

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  • Exchange-coupling composite magnetic recording medium and manufacturing method thereof
  • Exchange-coupling composite magnetic recording medium and manufacturing method thereof
  • Exchange-coupling composite magnetic recording medium and manufacturing method thereof

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Embodiment Construction

[0029] The present invention is further described below by means of examples.

[0030] Example description:

[0031] The thin film structure designed by the present invention is as follows figure 1 As mentioned above, the present invention is a new type of exchange-coupling composite film. First, it innovatively proposes to design an ECC film structure with a soft magnetic layer on the lower layer and a hard magnetic layer on the upper layer. The difficulty of realizing the composite structure lies in how to grow highly ordered FeRu layer on the soft magnetic layer. L 1 0 -FePt. We propose to insert a 3.0 nm-thick Pt intermediate layer between FeRu and FePt, which can well compensate for the lattice mismatch between the FeRu layer and the FePt layer interface, and inhibit the transfer of Fe to the FePt layer at high temperature. diffusion. figure 2 is FeRu( t ) / Pt(3.0 nm) / FePt(5.0 nm) thin film crystal structure measurement results, all thin film samples have FePt (001)...

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Abstract

The invention belongs to the technical field of magnetic storage, and particularly relates to an exchange-coupling composite magnetic recording medium and a manufacturing method thereof. The composite magnetic recording medium is a coupling composite film and comprises a soft magnetic layer, a middle layer, a hard magnetic layer and a protective layer sequentially from bottom to top, a substrate adopts a single crystal MgO substrate, the soft magnetic layer is a FeRu layer with a thickness of t, the middle layer is a Pt layer, the hard magnetic layer is L1<0>-FePt, and the protective later is a Pt layer. The problem that in the case of information writing in the traditional ECC structure, the distance between the lower layer and a magnetic head is over large, and the acquired magnetic field is insufficient can be solved. In the structure, the hard magnetic layer is the L1<0>-FePt thin film with the thickness of 5.0 nm and with high order degree, and the coercive force is about 9.0 kOe; through introducing the soft magnetic layer FeRu, when the thickness of the soft magnetic layer is 10.0 nm, the overall coercive force of the composite thin film can be reduced to 2.2 kOe; and when the included angle between an external field and a film surface normal changes between 0 DEG to 60 DEG, the coercive force angle feature curve of the ECC thin film presents good angle containment. Improvement of the performance facilitates writing of the information.

Description

technical field [0001] The invention belongs to the technical field of magnetic storage, and in particular relates to an exchange coupling composite magnetic recording medium, which can be used as a storage device such as a high-density hard disk. Background technique [0002] With the advent of the data age, the information that humans need to store has exploded. The capacity of storage devices can no longer keep up with the growth rate of information, and it is urgent to increase the capacity of storage devices to meet the increasing data storage requirements. As the backbone of storage devices, hard drives have always been favored. However, due to the superparamagnetic effect of magnetic recording media, its storage density is getting closer and closer to its limit of 1Tb / in 2 . The study found, L 1 0 -FePt has a high perpendicular magnetocrystalline anisotropy and a small critical grain size for thermal stability, and is considered to be the best choice for the next...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/706G11B5/718G11B5/851C23C14/16C23C14/18C23C14/35
CPCG11B5/70605C23C14/165C23C14/185C23C14/35G11B5/718G11B5/851
Inventor 张宗芝林亮朱振东赵柄丞朱伟骅金庆原
Owner FUDAN UNIV
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