摘要:
A magnetic disk has a magnetic layer and a protective layer disposed on the magnetic layer. A multiplicity of lands having sizes within a predetermined range of sizes and generally equal heights within a predetermined range are formed on the surface of the protective layer at a density within a predetermined range. The lands serve to effectively remove contaminants attached to the floating surface of a magnetic head to ensure a desired sliding reliability and floating stability of the head during a long period of time even in the case of a high-density magnetic disk apparatus in which the extent of floating of the head is small. The reliability with which the magnetic disk apparatus operates is thereby improved. The lands are formed on the surface of the protective layer by a process of forming a mask of fine particles on the protective layer surface and etching the protective layer surface through this mask.
摘要:
A magnetic recording medium excellent in corrosion resistance and rubbing reliability is realized by forming a number of concavities and convexities on the surface of a protective layer formed on a substrate and applying dry etching with a noble gas after the formation of the concavities and convexities to form a modified layer having hydrophobic nature on the surface of the protective layer.
摘要:
This invention relates to the magnetic recording medium, its manufacturing method and the magnetic disk apparatus, in which the ferromagnetic thin film is formed on the substrate board, and the protective layer is provided on that. A Magnetic recording medium of the has at least one layer of the protective layer on the magnetic surface, which is characterized in that the surface of the protective layer is provided with the high noncontinuous large resistance layer, and the density of the surface of the protective layer is higher than other regions other than the said surface. The magnetic recording medium has the surface of the protective layer which contains at least one kind or more of the element of the inert gas element, the halogen element and hydrogen. Therefore, when making a lower flying height of the magnetic head is achieved, the slide durability over the long term is improved, particularly, the slide durability of the magnetic disk apparatus using the MR head can be improved.
摘要:
There is provided a magnetic disk apparatus comprising: at least one magnetic disk having a magnetic layer and a surface protective layer on a substrate; a magnetic head which faces the magnetic disk in a rotating state with a micro gap and is supported by a slider; rotating means for rotating the magnetic disk; and a actuator for moving and positioning the magnetic head to a predetermined position on the magnetic disk, wherein a plurality of protrusions each having a flat surface are formed in at least a region on the surface of the magnetic disk where a contact start/stop operation can be executed. According to the above magnetic disk apparatus, since the frictional force between the disk and the head is small and the flying height of the head can be reduced and the good floating stability is obtained, so that the excellent recording and reproducing characteristics are derived. Further, protrusions are formed on the protective layer of the magnetic disk and the protrusion shapes are changed in a accordance with a radial position of the magnetic disk depending on the flying height of the magnetic head. According to the above magnetic disk apparatus, since the change of spacing can be set smaller than the change of the flying height, high recording density can be achieved.
摘要:
There is provided a magnetic disk apparatus comprising: at least one magnetic disk having a magnetic layer and a surface protective layer on a substrate; a magnetic head which faces the magnetic disk in a rotating state with a micro gap and is supported by a slider; rotating means for rotating the magnetic disk; and a actuator for moving and positioning the magnetic head to a predetermined position on the magnetic disk, wherein a plurality of protrusions each having a flat surface are formed in at least a region on the surface of the magnetic disk where a contact start/stop operation can be executed. According to the above magnetic disk apparatus, since the frictional force between the disk and the head is small and the flying height of the head can be reduced and the good floating stability is obtained, so that the excellent recording and reproducing characteristics are derived. Further, protrusions are formed on the protective layer of the magnetic disk and the protrusion shapes are changed in a accordance with a radial position of the magnetic disk depending on the flying height of the magnetic head. According to the above magnetic disk apparatus, since the change of spacing can be set smaller than the change of the flying height, high recording density can be achieved.
摘要:
A magnetic disk includes a substrate, a magnetic layer, and a protective layer. At least one region of a surface of the magnetic disk has protrusions. A height of each of the protrusions is not less than 5 nm and not greater than 40 nm, and is within ±30% of an average height of the protrusions. A density of the protrusions is not less than 200/mm2 and is not greater than 250,000/mm2. A width of a surface of each of the protrusions in a radial direction of the magnetic disk is not less than 0.1 &mgr;m and is not greater than 10 &mgr;m. The protrusions are discrete protrusions aligned in a spiral direction of the magnetic disk at a predetermined spacing in the radial direction of the magnetic disk. The at least one region of the surface of the magnetic disk includes flat areas between the protrusions. At least some of the flat areas extend continuously from an inner redius of the at least one region of the surface of the magnetic disk to an outer radius of t he at least one region of the surface of the magnetic disk.
摘要:
A method of forming projections on major surfaces of a disk comprises the steps of supporting the disk in a space, spraying a multiplicity of fine solid particles into the space, charging the sprayed fine solid particles with electricity of the same polarity so that the fine solid particles are floating in the space in a mutually separated state due to electric repellent forces acting between the fine solid particles, electrostatically depositing the fine solid particles charged with electricity on the surfaces of the disk, and etching the disk surfaces by using the deposited fine solid particles as masks, thereby forming a multiplicity of projections on the disk surfaces.
摘要:
A cleaning apparatus enables a workpiece to be rotated at a high speed over a long period, enables the outer and inner circumferences of the workpiece to be cleaned by a simple structure without provision of a special mechanism, and enables avoidance of formation of scratches in the radial direction of the workpiece. Chuck members 1-1 to 1-3 for chucking the outer periphery of a magnetic disk W are driven to rotate by a brush rotation mechanism 4 and are made to rock back and forth in the radial direction of the magnetic disk W by a rocking portion 6 of the brush rotation mechanism 4. Specifically, the rollers 12 of the chuck members 1-1 to 1-3 are formed by polyurethane foam and a plurality of circumferential grooves 14 are formed in the surface of the rollers 12. The rod-shaped brushes 3-1 and 3-2 are formed by attaching sponges 32 having a large number of bumps 30 to the front ends of shafts 31. The rocking portion 6 makes the sponges 32 rock back and forth so that the bumps 30 at the front end swing out to the inner circumference side of the magnetic disk W and the bumps 30 at the rear end swing out to the outer circumference side of the magnetic disk W.
摘要:
A polishing system and a method of control of the same enabling reliable transfer of the workpieces into and out of the system while maintaining the precision of polishing of the workpieces. Provision is made of a polishing apparatus 1, a first transfer apparatus 2, a second transfer apparatus 3, and a control apparatus 4. In the polishing apparatus 1, workpieces W held in m number of holding holes 14 formed in n number of carriers 14 are polished on their two surfaces by a lower platen 10 and an upper platen 19. The control apparatus 4 finds the revolution angle of the carriers 14 when the workpieces reach the desired thickness, makes the carriers revolve until the revolution angle of a whole multiple of 360.degree./n closest to the revolution angle found, and then makes the polishing apparatus 1 stop. Further, it finds the rotation angle of the carriers after stopping and makes mounters 24 and 34 of a loader 23 and unloader 33 rotate by exactly that rotation angle so as to transfer the workpieces W into and out from the carriers 14.
摘要:
A polishing amount control system and method for same which can quickly feed back the results of measurement of a coating layer of a workpiece to the next polishing work so as to improve the productivity of the workpieces and further enable high precision polishing work. The thicknesses of the plating layers of the two surfaces of a magnetic disk W polished by a double-side polishing apparatus 1 are measured by an X-ray thickness meter 2. The rotational speeds of the drive motors 15 and 18 of the double-side polishing apparatus 1 are controlled in accordance with the results of the measurement. Specifically, the polishing amounts of the plating layers of the upper surface and lower surface of the magnetic disk W polished next become within 1.8 .mu.m to 2.2 .mu.m by controlling the rotational speeds of the upper platen 13 and the lower platen 11. The thickness difference of the upper and lower surfaces of the same magnetic disk W become within -0.15 .mu.m to +0.15 .mu.m by controlling the rotational speed of one of the upper platen 13 and lower platen 11.