Patent application number | Description | Published |
20090015958 | Magnetic recording device and magnetic recording apparatus - A magnetic recording device includes: a laminated body including: a first ferromagnetic layer with a magnetization substantially fixed in a first direction; a second ferromagnetic layer with a variable magnetization direction; a first nonmagnetic layer disposed between the first ferromagnetic layer and the second ferromagnetic layer; and a third ferromagnetic layer with a variable magnetization direction. The magnetization direction of the second ferromagnetic layer is determinable in response to the orientation of a current, by allowing electrons spin-polarized by passing a current in a direction generally perpendicular to the film plane of the layers of the laminated body to act on the second ferromagnetic layer, and by allowing a magnetic field generated by precession of the magnetization of the third ferromagnetic layer to act on the second ferromagnetic layer. | 01-15-2009 |
20100237040 | Method for manufacturing glass stamper, glass stamper, and method for manufacturing magnetic recording medium - A method for manufacturing a glass stamper includes the following steps. First, a diamond film is formed on a substrate. A resist is applied onto the diamond film and a pattern is formed by performing electron beam lithography and development. The diamond film is etched with any one of oxygen and Ar gas using the pattern on the resist as a mask, thereby transferring the pattern to the diamond film. The resist and the substrate are removed to fabricate a diamond mold. Then, a glass stamper is manufactured by glass molding using the diamond mold. | 09-23-2010 |
20100247974 | Substrate for magnetic recording medium, magnetic recording medium, and magnetic recording apparatus - It is possible to improve the recording and reproducing S/N ratio, the reproduction signal intensity, and the degree of high density recording. There are provided a plurality of recording tracks formed on a substrate, each recording track being formed of a magnetic material, and non-recording sections formed on the substrate, each non-recording section separating adjacent recording tracks, each recording track including a plurality of recording sections and connecting sections for connecting the recording sections adjacent thereto in a track longitudinal direction, and each connecting section having a cross-sectional area in a track width direction that is smaller than a cross-sectional area in a track width direction of adjacent recording sections. | 09-30-2010 |
20110068319 | INFORMATION RECORDING AND REPRODUCING DEVICE - According to one embodiment, an information recording and reproducing device includes a stacked body. The stacked body includes a first layer, a second layer and a recording layer provided between the first layer and the second layer. The recording layer includes a phase-change material and a crystal nucleus. The phase-change material is capable of reversely changing between a crystal state and an amorphous state by a current supplied via the first layer and the second layer. The crystal nucleus is provided in contact with the phase-change material and includes a crystal nucleus material having a crystal structure identical to a crystal structure of the crystal state of the phase-change material, and a crystal nucleus coating provided on a surface of the crystal nucleus material and having a composition different from a composition of the crystal nucleus material. | 03-24-2011 |
20120061784 | MAGNETIC RECORDING DEVICE AND MAGNETIC RECORDING APPARATUS - An example magnetic recording device includes a laminated body. The laminated body includes a first ferromagnetic layer with a magnetization substantially fixed in a first direction; a second ferromagnetic layer with a variable magnetization direction; a first nonmagnetic layer disposed between the first ferromagnetic layer and the second ferromagnetic layer; a third ferromagnetic layer with a variable magnetization direction; and a fourth ferromagnetic layer with a magnetization substantially fixed in a second direction, wherein at least one of the first and second direction is generally perpendicular to the film plane. The magnetization direction of the second ferromagnetic layer is determinable in response to the orientation of a current, by passing the current in a direction generally perpendicular to the film plane of the layers of the laminated body and the magnetization of the third ferromagnetic layer is able to undergo precession by passing the current. | 03-15-2012 |
20120250406 | MAGNETIC MEMORY DEVICE AND METHOD OF MAGNETIC DOMAIN WALL MOTION - A magnetic memory device comprises a first electrode, a second electrode, a laminated structure comprising plural first magnetic layers being provided between the first electrode and the second electrode, a second magnetic layer comprising different composition elements from that of the first magnetic layer and being provided between plural first magnetic layers, a piezoelectric body provided on a opposite side to a side where the first electrode is provided in the laminated structure, and a third electrode applying voltage to the piezoelectric body and provided on a different position from a position where the first electrode is provided in the piezoelectric body. | 10-04-2012 |
20130200041 | Method for Manufacturing Glass Stamper and Method for Manufacturing Magnetic Recording Medium - A method for manufacturing a glass stamper includes the following steps. First, a diamond film is formed on a substrate. A resist is applied onto the diamond film and a pattern is formed by performing electron beam lithography and development. The diamond film is etched with any one of oxygen and Ar gas using the pattern on the resist as a mask, thereby transferring the pattern to the diamond film. The resist and the substrate are removed to fabricate a diamond mold. Then, a glass stamper is manufactured by glass molding using the diamond mold. | 08-08-2013 |
20130250668 | MAGNETIC MEMORY ELEMENT, MAGNETIC MEMORY, AND MAGNETIC MEMORY DEVICE - According to one embodiment, a magnetic memory element includes: a magnetic wire, a stress application unit, and a recording/reproducing unit. The magnetic wire includes a plurality of domain walls and a plurality of magnetic domains separated by the domain walls. The magnetic wire is a closed loop. The stress application unit is configured to cause the domain walls to circle around along the closed loop a plurality of times by applying stress to the magnetic wire. The recording/reproducing unit is configured to write memory information by changing magnetizations of the circling magnetic domains as the domain walls circle around and to read the written memory information by detecting the magnetizations of the circling magnetic domains. | 09-26-2013 |
20140078807 | MAGNETIC RECORDING DEVICE AND MAGNETIC RECORDING APPARATUS - An example magnetic recording device includes a magnetic recording section and a magnetization oscillator and a first nonmagnetic layer disposed between the magnetic recording section and the magnetization oscillator. The magnetic recording section includes a first ferromagnetic layer with a magnetization substantially fixed in a first direction; a second ferromagnetic layer with a variable magnetization direction; and a second nonmagnetic layer disposed between the first ferromagnetic layer and the second ferromagnetic layer. The magnetization oscillator includes a third ferromagnetic layer with a variable magnetization direction; a fourth ferromagnetic layer with a magnetization substantially fixed in a second direction; and a third nonmagnetic layer disposed between the third ferromagnetic layer and the fourth ferromagnetic layer. | 03-20-2014 |
20150055404 | MAGNETIC MEMORY DEVICE AND METHOD OF MAGNETIC DOMAIN WALL MOTION - A magnetic memory device comprises a first electrode, a second electrode, a laminated structure comprising plural first magnetic layers being provided between the first electrode and the second electrode, a second magnetic layer comprising different composition elements from that of the first magnetic layer and being provided between plural first magnetic layers, a piezoelectric body provided on a opposite side to a side where the first electrode is provided in the laminated structure, and a third electrode applying voltage to the piezoelectric body and provided on a different position from a position where the first electrode is provided in the piezoelectric body. | 02-26-2015 |