Patent application number | Description | Published |
20090135519 | Magnetic recording medium, method and apparatus for manufacturing magnetic recording apparatus - A magnetic recording medium includes a disk substrate, and recording cells arrayed on the disk substrate in a track direction, the recording cells includes a ferromagnetic pattern and a magnetic pattern formed on one of two sidewalls of the ferromagnetic pattern in the track direction and having a lower crystalline magnetic anisotropy constant Ku than that of the ferromagnetic pattern. | 05-28-2009 |
20090201607 | Patterned perpendicular magnetic recording medium and magnetic recording and reproducing apparatus - It is made possible to provide a patterned perpendicular magnetic recording medium that has smaller write magnetic field and the variation of magnetic characteristics in the bit regions, generates fewer reversed magnetic domains in the position control information regions of the head, and has excellent thermal stability. A patterned perpendicular magnetic recording medium includes: a nonmagnetic substrate; a soft magnetic base layer formed on the nonmagnetic substrate; a nonmagnetic intermediate layer formed on the soft magnetic base layer; and a perpendicular magnetic recording layer formed on the nonmagnetic intermediate layer, and including a stacked structure of a CoPt-based crystalline film having a Pt content in the range of 5 atomic percent to 35 atomic percent and a rare-earth and transition metal alloy amorphous film formed on the CoPt-based crystalline film. The CoPt-based crystalline film and the rare-earth and transition metal alloy amorphous film are exchange-coupled. | 08-13-2009 |
20100018946 | METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM - According to one embodiment, a method of manufacturing a magnetic recording medium includes forming a hard mask and a resist on a magnetic recording layer, imprinting a stamper on the resist to transfer patterns of protrusions and recesses, removing resist residues left in the recesses of the patterned resist, etching the hard mask using the patterned resist as a mask to transfer the patterns of protrusions and recesses, stripping the resist, and performing ion beam etching to remove the remaining hard mask and to modify a surface of the magnetic recording layer uncovered with the remaining hard mask. | 01-28-2010 |
20100018947 | METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM - According to one embodiment, a method of manufacturing a magnetic recording medium includes forming a magnetic recording layer, an oxidation inhibiting layer, a hard mask layer includes carbon on a substrate, coating the hard mask layer with a resist, transferring patterns of protrusions and recesses to the resist by imprinting to form resist patterns, sequentially performing etching of the hard mask layer using the resist patterns as masks, etching of the oxidation inhibiting layer, and etching and/or magnetism deactivation of the magnetic recording layer to form patterns of the magnetic recording layer, and sequentially performing stripping of the resist patterns, stripping of the hard mask layer and stripping of the oxidation inhibiting layer, in which ion beam etching is used for stripping the oxidation inhibiting layer. | 01-28-2010 |
20100047625 | METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM - According to one embodiment, a method of manufacturing a magnetic recording medium includes forming a resist on a magnetic recording layer, imprinting a stamper to the resist to transfer patterns of protrusions and recesses, and partially etching the magnetic recording layer in areas not covered with patterns of the resist used as masks by ion beam etching using a mixed gas of He and N | 02-25-2010 |
20100147791 | METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM - According to one embodiment, a method of manufacturing a magnetic recording medium includes forming a first hard mask, a second hard mask and a resist film on a magnetic recording layer, imprinting a stamper on the resist film to transfer patterns of recesses and protrusions, removing residues remained in recess of the patterned resist film, etching the second hard mask using the patterned resist film as a mask to transfer patterns of recesses and protrusions, etching the first hard mask using the patterned second hard mask as a mask to transfer patterns of recesses and protrusions, and deactivating magnetism of the magnetic recording layer exposed in the recesses together with removing the second hard mask by ion-beam etching. | 06-17-2010 |
20100214694 | METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM - According to one embodiment, a method of manufacturing a magnetic recording medium includes forming a first hard mask, a second hard mask and a resist on a magnetic recording layer, imprinting a stamper to the resist to transfer patterns of protrusions and recesses to the resist, removing residues remaining in the recesses of the patterned resist, etching the second hard mask by using the patterned resist as a mask to transfer the patterns of protrusions and recesses to the second hard mask, etching the first hard mask by using the second hard mask as a mask to transfer the patterns of protrusions and recesses to the first hard mask, removing the second hard mask remaining on the protrusions of the first hard mask, and deactivating the magnetic recording layer exposed in the recesses by means of ion beam irradiation. | 08-26-2010 |
20100214695 | METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM - According to one embodiment, a method of manufacturing a magnetic recording medium includes forming a first hard mask, a second hard mask and a resist on a magnetic recording layer, imprinting a stamper to the resist to transfer patterns of protrusions and recesses to the resist, removing residues remaining in the recesses of the patterned resist by means of a first etching gas, etching the second hard mask by means of the first etching gas using the patterned resist as a mask to transfer the patterns to the second hard mask, etching the first hard mask by means of a second etching gas different from the first etching gas using the second hard mask as a mask to transfer the patterns to the first hard mask, and performing ion beam etching in order to deactivate the magnetic recording layer exposed in the recesses and to remove the second hard mask. | 08-26-2010 |
20100215989 | METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM - According to one embodiment, a method of manufacturing a magnetic recording medium includes forming a first hard mask, a second hard mask and a resist on a magnetic recording layer, imprinting a stamper to the resist to transfer patterns of protrusions and recesses to the resist, removing residues remaining in the recesses of the patterned resist, etching the second hard mask by using the patterned resist as a mask to transfer the patterns of protrusions and recesses to the second hard mask, etching the first hard mask by using the second hard mask as a mask to transfer the patterns of protrusions and recesses to the first hard mask, subjecting the magnetic recording layer exposed in the recesses to modifying treatment to change an etching rate, and deactivating the magnetic recording layer exposed in the recesses. | 08-26-2010 |
20110000880 | METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM - According to one embodiment, a method of manufacturing a magnetic recording medium includes forming a resist on a magnetic recording layer, imprinting a stamper to the resist to transfer patterns of protrusions and recesses, and partially etching the magnetic recording layer in areas not covered with patterns of the resist used as masks by ion beam etching using a mixed gas of He and N | 01-06-2011 |
20110014496 | METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM - According to one embodiment, there is provided a method of manufacturing a magnetic recording medium, including forming a first hard mask including carbon as a main component, a second hard mask including a main component other than carbon and a resist on a magnetic recording layer, contacting a stamper to the resist to transfer patterns of protrusions and recesses to the resist, removing residues in the recesses of the patterned resist, etching the second hard mask, etching the first hard mask, patterning the magnetic recording layer, and removing the first hard mask, the method further including, between etching the first hard mask and removing the first hard mask, removing the second hard mask remaining on the protrusions of the first hard mask, and removing a contaminating layer on a surface of the first hard mask by a mixed gas of oxygen-based gas and a fluorine compound. | 01-20-2011 |
20110235212 | METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM - According to one embodiment, a method of manufacturing a magnetic recording medium includes forming on a magnetic recording layer a first hard mask, a second hard mask, a third hard mask and a resist, imprinting the resist with a stamper, removing a residue left in the recesses of the patterned resist, etching the third hard mask by use of the patterned resist as a mask, etching the second hard mask by use of the third hard mask as a mask, etching the first hard mask by use of the second hard mask as a mask, forming a pattern of the magnetic recording layer with ion beam irradiation, and removing the first hard mask by use of a remover liquid with higher reactivity to the metal material of the first hard mask than to a constituent element of the magnetic recording layer. | 09-29-2011 |
20120019960 | MAGNETIC RECORDING MEDIUM - According to one embodiment, a bit patterned medium includes a substrate, and a magnetic recording layer disposed above the substrate and including patterns of protrusions. Each of the protrusions contains a plurality of crystal grains. An average distance between the crystal grains is 0.5 to 3.0 nm in each of the protrusions. The protrusions include first protrusions each having a length of 1 μm or more in a radial direction of the medium and second protrusions each having a length in the radial direction shorter than the length of the first protrusion in the radial direction. Each of the first protrusions has a nucleation field Hn for magnetization reversal and a coercive force Hc satisfying the inequalities, Hn≧1.5 kOe and 0.5 kOe≦Hc−Hn≦1.5 kOe. | 01-26-2012 |
20120067843 | Method of forming fine pattern - A method of forming a fine pattern according to an embodiment includes: forming a hard mask on a substrate; forming a mask reinforcing member on the hard mask; forming a di-block copolymer layer on the mask reinforcing member, the di-block copolymer layer comprising a sea-island structure; forming a pattern comprising a concave-convex structure in the di-block copolymer layer, with island portions of the sea-island structure being convex portions; and transferring the pattern onto the hard mask by performing etching on the mask reinforcing member and the hard mask, with a mask being the pattern formed in the di-block copolymer layer. The mask reinforcing member is comprised of a material having an etching speed that is higher than an etching speed for the hard mask and is lower than an etching speed for sea portions of the sea-island structure of the di-block copolymer layer. | 03-22-2012 |
20120275058 | MAGNETIC RECORDING MEDIUM, METHOD OF MANUFACTURING THE SAME, AND MAGNETIC RECORDING/REPRODUCTION APPARATUS - According to one embodiment, a magnetic recording medium includes a substrate, an auxiliary layer formed on the substrate, and at least one perpendicular magnetic recording layer formed on the auxiliary layer. The perpendicular magnetic recording layer includes a magnetic dot pattern. The perpendicular magnetic recording layer is made of an alloy material containing one element selected from iron and cobalt, and one element selected from platinum and palladium. This alloy material has the L1 | 11-01-2012 |
20120275059 | PERPENDICULAR MAGNETIC RECORDING MEDIUM, METHOD OF MANUFACTURING THE SAME, AND MAGNETIC RECORDING/REPRODUCTION APPARATUS - According to one embodiment, a magnetic recording medium includes a substrate, an auxiliary layer formed on the substrate, and at least one perpendicular magnetic recording layer formed on the auxiliary layer. The perpendicular magnetic recording layer includes a magnetic dot pattern. The perpendicular magnetic recording layer is made of an alloy material containing one element selected from iron and cobalt, and one element selected from platinum and palladium. This alloy material has the L1 | 11-01-2012 |
20120276414 | MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING/REPRODUCTION APPARATUS - According to one embodiment, a perpendicular magnetic recording medium includes a nonmagnetic interlayer formed on a nonmagnetic substrate, an antiferromagnetic layer having a thickness of 2 to 30 nm, a first nonmagnetic underlayer having a thickness of 0.2 to 5 nm, a first bit patterned ferromagnetic layer, a first bit patterned nonmagnetic layer, and a second bit patterned ferromagnetic layer. | 11-01-2012 |
20130258523 | MAGNETIC RECORDING MEDIUM, MAGNETIC RECORDING/REPRODUCING APPARATUS, AND METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM - A magnetic recording medium of an embodiment includes: a substrate; a nonmagnetic base layer disposed on the substrate; a perpendicular magnetic recording layer disposed on the nonmagnetic base layer, having a hard magnetic recording layer, a nonmagnetic intermediate layer, and a soft magnetic recording layer, and divided into mutually separated plural regions; and a protective layer disposed on the perpendicular magnetic recording layer. The hard magnetic recording layer has an easy magnetization axis directed to a stack direction of the hard magnetic recording layer. The nonmagnetic intermediate layer contains one of C, ZnO, a carbide of Si, Ti, Ta or W, and a nitride of Si, Ti, Ta or W. | 10-03-2013 |
20140042013 | MAGNETIC RECORDING MEDIUM, METHOD OF MANUFACTURING THE SAME, AND MAGNETIC RECORDING/REPRODUCTION APPARATUS - According to one embodiment, a magnetic recording medium includes a substrate, an auxiliary layer formed on the substrate, and at least one perpendicular magnetic recording layer formed on the auxiliary layer. The perpendicular magnetic recording layer includes a magnetic dot pattern. The perpendicular magnetic recording layer is made of an alloy material containing one element selected from iron and cobalt, and one element selected from platinum and palladium. This alloy material has the L1 | 02-13-2014 |
20140139951 | MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING/REPRODUCTION APPARATUS - According to one embodiment, a perpendicular magnetic recording medium includes a nonmagnetic interlayer formed on a nonmagnetic substrate, an antiferromagnetic layer having a thickness of 2 to 30 nm, a first nonmagnetic underlayer having a thickness of 0.2 to 5 nm, a first bit patterned ferromagnetic layer, a first bit patterned nonmagnetic layer, and a second bit patterned ferromagnetic layer. | 05-22-2014 |
20140211338 | MAGNETORESISTIVE MAGNETIC HEAD AND MAGNETIC RECORDING AND REPRODUCING APPARATUS - A magnetic head according to an embodiment includes a first magnetic shield and a second magnetic shield that are opposed to each other, and a magnetoresistive film arranged between the first magnetic shield and the second magnetic shield, and including a first magnetic layer including a first metal layer that contains 90 at. % or more of Fe and a first Heusler alloy layer, a second magnetic layer arranged on a side of the first Heusler alloy layer opposite from the first magnetic layer, and an intermediate layer arranged between the first Heusler alloy layer and the second magnetic layer. | 07-31-2014 |
20140334029 | MAGNETORESISTIVE ELEMENT, MAGNETIC HEAD, AND MAGNETIC RECORDING AND REPRODUCING APPARATUS - A magnetoresistive element according to an embodiment includes: a magnetoresistance effect film including: a first and second magnetic films; and an intermediate film disposed between the first and second magnetic films, at least one of the first and second magnetic films being formed of a Heusler alloy expressed as Co | 11-13-2014 |
20140334041 | MAGNETORESISTIVE ELEMENT, MAGNETIC HEAD, MAGNETIC RECORDING AND REPRODUCING APPARATUS, AND METHOD OF MANUFACTURING MAGNETORESISTIVE ELEMENT - A magnetoresistive element according to an embodiment includes: a magnetoresistance effect film including: a first magnetic film; a second magnetic film; and an intermediate film of a nonmagnetic material disposed between the first magnetic film and the second magnetic film, at least one of the first magnetic film and the second magnetic film being formed of a material expressed as A | 11-13-2014 |