Abstract: An object is to provide a burnishing method in which it is possible to reduce the flying height of a magnetic head by improving the smoothness of the surface of a magnetic disk while suppressing contamination of the magnetic disk due to falling-off or crushing of abrasive grains from a polishing tape. In the burnishing method, an alignment process of adjusting the position in a thickness direction of a magnetic disk 10 of an outer peripheral plate 75 installed outside an outer peripheral end 10c of at least one of the magnetic disk 10 and the magnetic disk 10 so as to make the surface of the outer peripheral plate 75 and the surface of the magnetic disk 10 become flush with each other is performed between a substrate installation process and a burnishing process.

Abstract: Provided is a method of manufacturing a magnetic recording mediums comprising employing a lifting and drying device for cleaning substrates by immersing one or more disk-like substrates with a central hole into a cleaning liquid disposed in a cleaning tank and lifting and drying the substrates, the lifting and drying device including: a hanger mechanism that is inserted through the central hole of the substrates and supports a plurality of the substrates while being hung thereon; an elevation mechanism that elevates the hanger mechanism between a position where the substrates are immersed into the cleaning liquid inside the cleaning tank and a position where the substrates are lifted from the cleaning tank; and an ejection mechanism that is disposed in the cleaning tank and ejects the cleaning liquid from the downside of the hanger mechanism toward the substrate.

Abstract: An object is to provide a burnishing method in which it is possible to reduce the flying height of a magnetic head by improving the smoothness of the surface of a magnetic disk while suppressing contamination of the magnetic disk due to falling-off or crushing of abrasive grains from a polishing tape. In the burnishing method, an alignment process of adjusting the position in a thickness direction of a magnetic disk 10 of an outer peripheral plate 75 installed outside an outer peripheral end 10c of at least one of the magnetic disk 10 and the magnetic disk 10 so as to make the surface of the outer peripheral plate 75 and the surface of the magnetic disk 10 become flush with each other is performed between a substrate installation process and a burnishing process.

Abstract: There are provided an abrasive tape capable of suppressing contamination of a magnetic disk due to shattered abrasive particles and smoothing the surface of the magnetic disk; a method for producing an abrasive tape; and a varnishing process. An abrasive tape 1 produced according to the method for producing an abrasive tape of the invention is used in a process for varnishing a magnetic disk and produced according to a process for preparing a slurry by kneading and dispersing abrasive particles 5 and a binding agent 6; a process for forming a coating film by applying the slurry on a support 2; a process for forming an abrasive particle layer 3 by hardening the coating film; and a process for forming a coating layer 4 on the surface of the abrasive particle layer 3.

Abstract: There is provided a method for manufacturing a perpendicular magnetic recording medium that includes a step for forming a smooth substrate surface without generating abnormal protrusions or the like when forming a magnetic film or the like on the surface of the substrate, the method for manufacturing a perpendicular magnetic recording medium characterized by including a polishing step in which the surface of a non-magnetic substrate is smoothed before forming the laminated structure on top of the non-magnetic substrate, wherein a polishing liquid used in the polishing step contains diamond particles within a range from 0.001 to 0.05% by mass and also contains a polishing accelerator within a range from 10 to 100 times the amount of diamond particles, and the polishing accelerator is an organic polymer material containing a sulfonic group or a carboxylic group and having an average molecular weight of 4,000 to 10,000.

Abstract: Disclosed are a flow-through washing method and a flow-through washing apparatus which efficiently remove dust adhering to the surface of a substrate and prevent dust from adhering to the surface of the substrate again after washing. The flow-through washing method runs washing liquid (L) inside a washing tank (2) in the lateral direction, and applies an ultrasonic vibration to the washing liquid (L) in a state in which an object (W) to be washed is immersed in this washing liquid (L), whilst washing this object (W). By regulating the flow rate of the washing liquid (L) flowing in any of the feed ports (3) and/or discharge ports (5) of a plurality of feed ports (3) which feed the washing liquid (L) to the washing tank (2) and plurality of discharge ports (5) which discharge washing liquid (L) from the washing tank (2), the washing liquid (L) inside the washing tank (2) can be set so as to run in a laminar flow state.

Abstract: Provided is a lifting and drying device for cleaning substrates by immersing one or more disk-like substrates with a central hole into a cleaning liquid disposed in a cleaning tank and lifting and drying the substrates, the lifting and drying device including: a hanger mechanism that is inserted through the central hole of the substrates and supports a plurality of the substrates while being hung thereon; an elevation mechanism that elevates the hanger mechanism between a position where the substrates are immersed into the cleaning liquid inside the cleaning tank and a position where the substrates are lifted from the cleaning tank; and an ejection mechanism that is disposed in the cleaning tank and ejects the cleaning liquid from the downside of the hanger mechanism toward the substrate.

Abstract: A magnetic recording medium is provided, which has at least one soft magnetic layer, at least one seed layer, at least one underlayer and at least one perpendicular magnetic recording layer, and is characterized in that the or each seed layer is comprised of a covalently bonded material. The covalently bonded material preferably predominantly comprises a nitride having a hexagonal crystal structure, more preferably, predominantly comprises aluminum nitride having a hexagonal wurtzite crystal structure. This magnetic recording medium is superior in recording and reproducing an information with high density.

Abstract: In a perpendicular magnetic recording medium having at least a soft magnetic back layer, an underlayer, an intermediate layer and a perpendicular magnetic recording layer on a nonmagnetic substrate, at least one layer in the intermediate layer contains Re as a main component element and contains, as a second main component element, an element having an hcp structure or an element having a bcc structure. The concentration of Re as the main component element of the intermediate layer is within the range from 55 to 99.5 atomic percent. The second component element is Co or Cr.

Abstract: A magnetic recording medium is provided, which has at least one soft magnetic layer, at least one seed layer, at least one underlayer and at least one perpendicular magnetic recording layer, and is characterized in that the or each seed layer is comprised of a covalently bonded material. The covalently bonded material preferably predominantly comprises a nitride having a hexagonal crystal structure, more preferably, predominantly comprises aluminum nitride having a hexagonal wurtzite crystal structure. This magnetic recording medium is superior in recording and reproducing an information with high density.

Abstract: A magnetic recording medium comprising a substrate, at least one soft magnetic underlayer formed on the substrate, a perpendicular magnetic recording layer formed on the soft magnetic underlayer, and a protective layer formed on the perpendicular magnetic recording layer, is provided wherein the perpendicular magnetic recording layer is comprised of a primary recording layer, a non-magnetic intermediate layer and an auxiliary layer; the primary recording layer comprises magnetic crystal grains and grain boundary portions surrounding the magnetic crystal grains, and has a perpendicular magnetic anisotropy; the auxiliary layer has a negative magneto crystalline anisotropy; and the non-magnetic intermediate layer is formed between the primary recording layer and the auxiliary layer and comprises at least one metal selected from Ru, Rh and Ir, or at least one alloy thereof.

Abstract: The present invention provides a magnetic recording medium capable of reducing the diameter of particles of a perpendicular magnetic recording layer and obtaining a high perpendicular orientation to enable information to be recorded or reproduced at a high density, a method of manufacturing the same, and a magnetic recording/reproducing apparatus. A perpendicular magnetic recording medium includes a non-magnetic substrate; and at least a soft magnetic layer, an underlayer, an intermediate layer, and a perpendicular magnetic recording layer that are formed on the non-magnetic substrate in this order. The underlayer is a (111) crystal orientation layer having an fcc structure, and the intermediate layer includes a (110) crystal orientation layer having a bcc structure and a (002) crystal orientation layer having an hcp structure in this order. The (110) crystal orientation layer having the bcc structure includes 60 at % or more of Cr.

Abstract: There is provided a method for manufacturing a perpendicular magnetic recording medium that includes a step for forming a smooth substrate surface without generating abnormal protrusions or the like when forming a magnetic film or the like on the surface of the substrate, the method for manufacturing a perpendicular magnetic recording medium characterized by including a polishing step in which the surface of a non-magnetic substrate is smoothed before forming the laminated structure on top of the non-magnetic substrate, wherein a polishing liquid used in the polishing step contains diamond particles within a range from 0.001 to 0.05% by mass and also contains a polishing accelerator within a range from 10 to 100 times the amount of diamond particles, and the polishing accelerator is an organic polymer material containing a sulfonic group or a carboxylic group and having an average molecular weight of 4,000 to 10,000.

Abstract: A perpendicular magnetic recording medium is provided, which has a backing layer, a primer layer, an intermediate layer and at least one perpendicular magnetic recording layer, and is characterized in that the perpendicular magnetic recording layer contains Co and Cr, and at least one of the perpendicular magnetic recording layer or layers has a granular structure comprising ferromagnetic crystal grains and grain boundaries comprised of non-magnetic tungsten oxide. The perpendicular magnetic recording layer may be a double-layered structure comprising the tungsten oxide grain boundary-containing layer and a Cr oxide, Si oxide, Ta oxide or Ti oxide grain boundary-containing layer formed on the tungsten oxide grain boundary-containing layer. The perpendicular magnetic recording medium exhibits good perpendicular orientation and has ferromagnetic crystal grains with extremely small grain size, and thus, is superior in high recording density characteristic.

Abstract: Disclosed is a burnishing tape, a method of producing the same and a method of burnishing a magnetic disk with which a surface of the magnetic disk may be smoothed while contamination of a magnetic disk caused by crushed abrasive grains is prevented. A burnishing tape (1) manufactured by the method of manufacturing of the burnishing tape according to an embodiment of the invention is used to burnish the magnetic disk. The method includes: kneading and dispersing abrasive grains (5) and a binder (6) to prepare slurry; applying the slurry on the support (2) to form a coating layer; curing the coating layer to form an abrasive grain layer (3); and forming a liquid lubricant layer (4) on a surface of the abrasive grain layer (3).

Abstract: There are provided an abrasive tape capable of suppressing contamination of a magnetic disk due to shattered abrasive particles and smoothing the surface of the magnetic disk; a method for producing an abrasive tape; and a varnishing process. An abrasive tape 1 produced according to the method for producing an abrasive tape of the invention is used in a process for varnishing a magnetic disk and produced according to a process for preparing a slurry by kneading and dispersing abrasive particles 5 and a binding agent 6; a process for forming a coating film by applying the slurry on a support 2; a process for forming an abrasive particle layer 3 by hardening the coating film; and a process for forming a coating layer 4 on the surface of the abrasive particle layer 3.

Abstract: The present invention provides a magnetic recording medium capable of recording or reproducing high-density information by reducing the grain size of a perpendicular magnetic recording layer and improving vertical orientation, a method of manufacturing the same, and a magnetic recording/reproducing apparatus. The perpendicular magnetic recording medium includes: a non-magnetic substrate; and at least an soft magnetic layer, an under layer, an intermediate layer, and a perpendicular magnetic recording film that are formed on the non-magnetic substrate. At least one layer of the intermediate layer is made of an alloy material of an element having an fcc structure and an element having a bcc structure or an hcp structure, and has both a crystal structure having (111) orientation and an irregular layer lattice (stacking fault) caused by a mixture of the fcc structure and the bcc structure.

Abstract: A process for producing a magnetic recording medium, which process comprises a texturing step for forming texture grooves having a line density of 7,500 lines/mm or more on the surface of a non-metallic substrate, and a step for forming an orientation-determining film, a non-magnetic undercoat layer, and a magnetic layer on the non-metallic substrate.

Abstract: An electric vacuum cleaner in which it is possible to ensure an increased area of a lower mesh filter 34 while saving space is provided.

Abstract: A process for producing a magnetic recording medium, which process comprises a texturing step for forming texture grooves having a line density of 7,500 lines/mm or more on the surface of a non-metallic substrate, and a step for forming an orientation-determining film, a non-magnetic undercoat layer, and a magnetic layer on the non-metallic substrate.