Magnetic recording medium and magnetic recording apparatus
A technology of magnetic recording and magnetic recording layer, applied in the direction of magnetic recording, magnetic recording layer, data recording, etc., can solve the problem of insufficient noise reduction.
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Embodiment 1
[0074] exist figure 1 A schematic cross-sectional view of the magnetic recording medium of the present invention is shown in . The magnetic recording medium has a substrate dense layer 3 , a cladding layer 5 , a non-magnetic orientation control layer 7 , a magnetic recording layer 9 and a protective layer 10 on a substrate 1 . The cladding layer 5 is composed of a microcrystalline precipitation type soft magnetic layer 51 and a crystalline soft magnetic layer 53 , and the crystalline soft magnetic layer 53 is formed on the magnetic recording layer 9 side. In this embodiment, Fe—Ta—C is used for the microcrystalline precipitation soft magnetic layer 51 , and permalloy is used for the crystalline soft magnetic layer 53 . It is not limited thereto, and the Fe-Ta-C of the microcrystal precipitation soft magnetic layer 51 may be replaced by a microcrystal precipitation soft magnetic material such as Fe-Ta-N, and a crystalline soft magnetic material such as Fe-Al-Si may be used. T...
Embodiment 2
[0128] exist Figure 6 A schematic sectional view of another specific example of the magnetic recording medium of the present invention is shown in . The magnetic recording medium has a nonmagnetic layer 62 , a magnetic recording layer 63 and a protective layer 64 on a substrate 1 . A magnetic recording medium is produced in the following procedure.
[0129] In the following description, in terms of evaluating the characteristics of the produced media, the media substrate for evaluation should be a glass substrate for magnetic disks from the perspective of industrialization. As will be described later, it is difficult to heat up to high temperatures because of the use of general glass substrates. We conducted experiments, so we studied the production process of thermally oxidized silicon substrates first, and then produced media using glass substrates for magnetic disks, and confirmed the characteristics of magnetic disks.
[0130] First, clean the thermally oxidized silicon...
Embodiment 3
[0204] Figure 10 A schematic cross-sectional view showing another embodiment of the magnetic recording medium of the present invention. The magnetic recording medium has a magnetic recording layer 9 and a protective layer 10 on a substrate 1 . In this embodiment, the magnetic recording layer 9 is directly formed on the substrate 1 , but a non-magnetic layer may be provided between the substrate 1 and the magnetic recording layer 9 in order to improve the crystal orientation of the magnetic recording layer 9 . Alternatively, between the substrate 1 and the magnetic recording layer 9, a cladding layer formed of a soft magnetic material may be used to constitute a two-layer perpendicular magnetic recording medium.
[0205] In this embodiment, there are no special restrictions on the metal film or conductive film formation method. The method mentioned in the embodiment is a representative film formation method. In the case of metal film or conductive film formation , DC magnetr...
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Abstract
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