Magnetic disk and method of producing the same

#This invention relates to a magnetic disk to be loaded in a magnetic disk apparatus, such as a HDD (hard disk drive), for recording information and a method of producing the same.

#At present, following the development of the IT (information technology) industry, it is requested to achieve dramatic technical innovation in the information recording technology, in particular, the magnetic recording technology. For example, in the field of a magnetic disk to be loaded in a magnetic disk apparatus, such as a HDD, there is a demand for a technique capable of achieving an information recording density on the order of 40 Gbit/inch2 to 100 Gbit/inch2 or more.

#In the magnetic disk apparatus, use has been made of a CSS (Contact Start and Stop) system. In the CSS system, a magnetic head is kept in contact with a contact sliding zone formed on a surface of a magnetic disk when the magnetic disk apparatus is turned off or stopped. In a starting operation, the magnetic head slides on the contact sliding zone in contact therewith to be slightly lifted up. Then, a read or a write operation is started in a read/write zone located outside or inside the contact sliding zone. In the CSS system, the contact sliding zone separate from the read/write zone must be provided on the magnetic disk.

#A sole FIGURE is a schematic sectional view of a magnetic disk according to an embodiment of this invention.

#Now, description will be made of embodiments of this invention in detail in conjunction with several specific examples. It is noted here that this invention is not limited to the following examples.

#Referring to the sole FIGURE, a magnetic disk 10 in Example 1 comprises a glass substrate 1 with a nonmagnetic metal layer 2 composed of a seed layer 2a and an underlayer 2b, a magnetic layer 3, a carbon-based protection layer 4, an alcohol-based coupling layer 5, and a lubrication layer 6 successively laminated on the glass substrate 1. Each of these layers except the magnetic layer 3 is a nonmagnetic layer. FIG. 1 shows a state immediately after deposition. A boundary between he alcohol-based coupling layer 5 and the lubrication layer 6 may become unclear with lapse of time because of mutual diffusion.

#Next, description will be made of a method of producing the magnetic disk 10 in Example 1.