Target material and its application in recording layer material of magnetic recording media

Abstract

The invention discloses a target material, which is formed by the main material of: CoPt-copper oxide-oxide or CoCrPt-copper oxide-oxide or CoCrPtB-copper oxide-oxide. The added copper oxide is the main technological characteristic. With the application of the target material in the sputtering process of a recording layer material of a magnetic recording media, the sputtering process is stable and the required thickness of an intergranular layer of magnetic particles in the recording layer can be reduced. In addition, thermal stability is high. Therefore, recording density of the recording layer of the magnetic recording media can be raised, and recording capacity of the whole storage media is enhanced.

Description

technical field [0001] The invention relates to a storage medium, especially a target material and a recording layer material used in a magnetic recording medium. Background technique [0002] At present, the magnetic recording of hard disks can be divided into two types according to the direction of magnetization: horizontal recording (longitudinal magnetic recording) and vertical recording (perpendicular magnetic recording). Vertical disc surface. The structure of perpendicular recording media includes substrate (glass or aluminum), adhesion layer, soft underlayer, seed layer, intermediate layer, recording layer, cover layer ( covering layer) and lubricating layer (lubricative layer), such as figure 1 As shown, the most important key technology is the recording layer. Such as figure 2 As shown in the literature report IEEETrans.Magn., 38 (2002) 1976 pointed out that adding oxides in a very thin CoPt-based magnetic recording layer can effectively make the oxide segrega...

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Problems solved by technology

[0005] 1. In order to reduce noise, it is necessary to increase the amount of oxides to achieve good isolation of magnetic particles; but when too much oxide is added, some oxides will run into the magnetic particles, which will cause increased noise

[0006] 2. During the sputtering process, if there are more oxides in the target, it is easier to cause arcing in the local area of ​​the target surface, which will affect the quality of the coating and cause the deposited film to fail to meet the quality requirements.

Although the above-mentioned documents and the technical means provided in the U.S. publication point out that adding an appropriate amount of oxide can reduce the magnetic coupling phenomenon and improve the signal-to-noise ratio, it still cannot provide a target material and be used in the recording of magnetic recording media. layer material, which can directly improve the problem caused by too much oxide in the sputtering process and can reduce the required G.B. oxide thickness in the recording layer

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