Patents Assigned to Fuji Electric Device Technology Co., Ltd.
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Publication number: 20110096640Abstract: A method of drawing a pattern for magnetic transfer on a substrate, including the steps of rotating the substrate and scanning the substrate, by an electron beam, in a circumferential direction thereof, deflecting, using a deflection signal, the electron beam in a radial direction thereof, and switching irradiation of the electron beam on and off, so as to create the pattern of a plurality of dots.Type: ApplicationFiled: October 22, 2010Publication date: April 28, 2011Applicant: Fuji Electric Device Technology Co., Ltd.Inventor: Hiroto KIKUCHI
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Publication number: 20110096429Abstract: A master disk for magnetic transfer of a reference servo signal in a spiral mode, having a pattern including a plurality of dots groups, which are disposed at different radial positions of the master disk with a first pitch, and correspond to the reference servo signal in the spiral mode. Each of the plurality of dot groups includes a plurality of dots, successively disposed with a second pitch along a circumferential direction of the master disk at a same one of the radial positions. Each of the plurality of dots is of a ferromagnetic material, and has four sides, two opposing sides thereof extending in the circumferential direction, and the other two opposing sides thereof extending in a radial direction of the master disk.Type: ApplicationFiled: October 22, 2010Publication date: April 28, 2011Applicant: Fuji Electric Device Technology Co., Ltd.Inventor: Hiroto KIKUCHI
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Publication number: 20110086471Abstract: A method of producing a semiconductor device that has a silicon substrate including a first major surface and a second major surface thereof, a front surface device structure being formed in a region of the first major surface, the method has a step of forming a rear electrode in a region of the second major surface, which includes evaporating or sputtering aluminum-silicon onto the second major surface to form an aluminum silicon film as a first layer of the rear electrode, the aluminum silicon film having a silicon concentration of at least 2 percent by weight when the thickness thereof is less than 0.3 ?m.Type: ApplicationFiled: December 17, 2010Publication date: April 14, 2011Applicant: Fuji Electric Device Technology Co., Ltd.Inventors: Kenichi KAZAMA, Tsunehiro Nakajima, Koji Sasaki, Akio Shimizu, Takashi Hayashi, Hiroki Wakimoto
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Patent number: 7923135Abstract: A magnetic recording medium is formed by stacking in order, on a nonmagnetic base, at least an underlayer, magnetic recording layer, and protective layer. The magnetic recording layer includes a plurality of magnetic layers and an exchange-coupling control layer, and the magnetic recording medium is characterized in that a physical pattern is formed in the exchange-coupling control layer. The exchange-coupling control layer is located between the magnetic layers of the magnetic recording layer.Type: GrantFiled: March 23, 2009Date of Patent: April 12, 2011Assignee: Fuji Electric Device Technology Co., Ltd.Inventor: Sadayuki Watanabe
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Publication number: 20110076514Abstract: A magnetic recording medium includes a substrate; a magnetic recording layer that is provided on the substrate and that has a plurality of tracks; and a separation layer that magnetically separates respective tracks of the plurality of tracks of the magnetic recording layer from one another and that is composed of a material including a nonmagnetic amorphous alloy selected from the group consisting of chromium boride (CrB), nickel boride (NiB), chromium phosphide (CrP), and nickel phosphide (NiP). The nonmagnetic amorphous alloy is used as a filler material for the separation layer and has a smooth surface after filling and an excellent corrosion resistance. This enables production of the magnetic recording medium by a simple method so that producibility is excellent and without spoiling reliability.Type: ApplicationFiled: July 7, 2010Publication date: March 31, 2011Applicant: Fuji Electric Device Technology Co., Ltd.Inventor: Noboru KURATA
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Patent number: 7910233Abstract: A magnetic recording medium for use in a thermally assisted recording system is disclosed. The magnetic recording medium comprises at least a magnetic layer, a protective layer and a lubricant layer formed on a nonmagnetic substrate, wherein a lubricant of the lubricant layer exhibits such a heat resistance that an amount of volatilization when the magnetic layer is heated to a temperature not lower than a temperature Tw is less than 1% with respect to an initial amount of the lubricant in an unheated condition. The present invention addresses a problem of the heat resistance performance of the lubricant for use in magnetic recording media and provides a magnetic recording medium exhibiting high heat resistance.Type: GrantFiled: October 29, 2008Date of Patent: March 22, 2011Assignee: Fuji Electric Device Technology Co., Ltd.Inventors: Takeshi Watanabe, Kunihiro Imai, Takako Matsumoto
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Publication number: 20110048628Abstract: A method of manufacturing a discrete track medium type perpendicular magnetic recording layer with reduced magnetic interference between tracks and enhanced magnetic recording density is disclosed in which protruding parts of a pattern of protrusions and recesses provided in a composite magnetic recording layer are formed in high quality having a similar film thickness and equivalent perpendicular magnetic recording performance to a perpendicular magnetic recording layer designed for a continuous film type medium.Type: ApplicationFiled: August 10, 2010Publication date: March 3, 2011Applicant: FUJI ELECTRIC DEVICE TECHNOLOGY CO.,LTD.Inventor: Akira SATO
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Patent number: 7894152Abstract: A servo pattern magnetization method is provided, having full-amplitude servo signals, to eliminate the need for intensity modification and waveform shaping during servo signal reading, and to improve the precision of head positioning and enable an increase in track recording density. A servo pattern magnetization method for a perpendicular recording discrete track medium, having a plurality of recording areas and a plurality of servo areas separating the plurality of recording areas, has a process of recording magnetization perpendicular to the substrate and in opposite directions in each of the magnetic recording layers of the plurality of servo blocks, by means of the leakage magnetic field from the soft magnetic layers separated from other servo blocks when a magnetic field is applied.Type: GrantFiled: January 10, 2008Date of Patent: February 22, 2011Assignee: Fuji Electric Device Technology Co., Ltd.Inventor: Kiminori Sato
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Patent number: 7888173Abstract: A semiconductor device manufacturing method includes the steps of preparing a semiconductor element having a first electrode, a second electrode, and a third electrode facing the first electrode and second electrode, the first electrode and second electrode being electrically separated by an insulating layer; arranging a first conductive bonding material on a first metal foil and placing the semiconductor element on the first conductive bonding material; supporting a sheet-shape second conductive bonding material by the insulating layer; arranging a first post electrode and a second post electrode above the first and second electrodes respectively with the second conductive bonding material intervening therebetween; and forming a first conductive bonding layer for bonding the first electrode and the first post electrode, a second conductive bonding layer for bonding the second electrode and the second post electrode, and a third conductive bonding layer for bonding the third electrode and the first metal foilType: GrantFiled: March 12, 2009Date of Patent: February 15, 2011Assignee: Fuji Electric Device Technology Co., Ltd.Inventors: Harutaka Taniguchi, Yoshinari Ikeda
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Patent number: 7879468Abstract: A magnetic recording medium is disclosed in which there is no degradation of magnetic characteristics at the time of manufacture, such as is seen in proposed discrete-track media or patterned media. The medium can be manufactured by a simple method and results in excellent productivity. Magnetic recording media have a substrate, and, provided thereon in order from the substrate side, are a soft magnetic layer, a crystal orientation control layer, and a magnetic recording layer. The area of at least a portion of the crystal orientation control layer is provided with a depressed portion. Portions of the magnetic layer formed on this depressed portion have a non-granular structure, whereas portions of the magnetic formed on the crystal orientation control layer outside the depressed portion have a granular structure.Type: GrantFiled: March 4, 2008Date of Patent: February 1, 2011Assignee: Fuji Electric Device Technology Co., Ltd.Inventor: Shinji Uchida
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Patent number: 7875374Abstract: Substrates for perpendicular magnetic recording media, and perpendicular magnetic recording media using such substrates, are disclosed. By setting the substrate inclination angle, or a parameter related to substrate shape relating to this angle, within an appropriate range, magnetic recording media can be obtained with excellent read signal quality and signal quality stability, regardless of the final substrate machining method.Type: GrantFiled: May 14, 2008Date of Patent: January 25, 2011Assignee: Fuji Electric Device Technology Co., Ltd.Inventor: Hiroshi Minazawa
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Publication number: 20110013303Abstract: A magnetic transfer device and method are provided. A magnetic field generating structure comprises a pair of permanent magnets connected to a return yoke. Respective magnetic poles of the magnets, of a different polarity from one another, oppose each other with a conjoined body disposed therebetween. The magnetic field generating structure is moved from a position at an outer periphery of the conjoined body, to a position at an inner periphery of the conjoined body, and then moved from the position at the inner periphery across the conjoined body toward the outer periphery, to a position outside of the conjoined body. The return yoke is positioned at a radially more outward position, toward the outer periphery, than are the permanent magnets. The movement of the magnetic field generating structure is carried out while maintaining a constant distance from the rotating conjoined body.Type: ApplicationFiled: July 7, 2010Publication date: January 20, 2011Applicant: Fuji Electric Device Technology Co., Ltd.Inventor: Hiroto KIKUCHI
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Patent number: 7872461Abstract: A reverse current stopping circuit includes a synchronous rectification device, a comparator for detecting a reverse current of an inductor, the synchronous rectification device being turned off when the reverse current is detected by the comparator, a reverse current detector circuit for detecting a switching terminal voltage after the synchronous rectification device is turned off, thereby determining a value of the inductor current to decide whether the inductor current is flowing in a reverse direction or a forward direction, and a memory unit for receiving a predetermined output signal from the reverse current detector circuit in accordance with a result of the reverse current detector circuit, and outputting a control signal for an offset voltage in accordance with the predetermined output signal. The offset voltage is changed in accordance with the control signal so as to adjust the inductor current to zero when the synchronous rectification device is turned off.Type: GrantFiled: May 21, 2009Date of Patent: January 18, 2011Assignee: Fuji Electric Device Technology Co., Ltd.Inventor: Kouhei Yamada
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Publication number: 20110000879Abstract: A method of easily manufacturing a master disk for magnetic transfer is disclosed. The method of the invention facilitates separation of the master disk and a slave disk to be transferred even after conducting a magnetic transfer process after adhering the two disks by pressing or exhaustion for the purpose of enhancing transfer performance. A method of manufacturing a master disk comprises a step of forming recesses by eliminating selected parts of a surface region of soft magnetic layer 20 that is uniformly formed on the surface of substrate 10, to a depth not to cut apart the parts with one another, and a step of transforming recessed parts 20b to a nonmagnetic or low magnetic state. The steps forms a pattern of protrusions 20a and recesses 20b corresponding to information to be magnetically transferred, the protrusions 20a being magnetic and the recesses 20b being nonmagnetic or low magnetic.Type: ApplicationFiled: July 2, 2010Publication date: January 6, 2011Applicant: FUJI ELECTRIC DEVICE TECHNOLOGY CO., LTD.Inventor: Satomi Kajiwara
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Publication number: 20110002059Abstract: A magnetic transfer method includes a conjoined body formation step of stacking a transfer master storing transfer information on a transfer receiving body. Air between contact surfaces of the transfer master and transfer receiving body is pushed out in the direction of a non-pressurized area by pressurizing the stacked transfer master and transfer receiving body, to form the conjoined body. The method further includes a transfer step of, by bringing a magnetic field generating module close to the conjoined body, and applying a magnetic field, carrying out a magnetic transfer of the transfer information from the transfer master to the transfer receiving body. A surface roughness of smooth portions of the transfer master in which no transfer information is formed, and the surface roughness of the transfer receiving body, is 1 nm or less.Type: ApplicationFiled: June 30, 2010Publication date: January 6, 2011Applicant: Fuji Electric Device Technology Co., Ltd.Inventor: Narumi SATO
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Publication number: 20100330270Abstract: A method of manufacturing a magnetic recording medium includes providing a substrate that is a magnetic recording medium substrate having a disc shape, having two main surfaces, and having defined therein a center hole; holding the center hole of the substrate from both main surfaces with two holding members that each have a disc shape to hold the substrate and to cover at least the periphery of the center hole adjacent to the two main surfaces of the substrate; and applying resist liquid simultaneously to both main surfaces of the substrate using spin coating to form a resist layer simultaneously on both main surfaces while maintaining the periphery of the center hole immediately adjacent to the two main surfaces of the substrate resist-free as an unapplied portion. The method enables efficient formation of uniform resist layers without defects on both faces of the substrate.Type: ApplicationFiled: June 22, 2010Publication date: December 30, 2010Applicant: Fuji Electric Device Technology Co., Ltd.Inventors: Yuichi HASHIZUME, Kunio Hibino
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Publication number: 20100330221Abstract: An imprint stamper and imprint device are provided which, at the same time as being able to swiftly separate a substrate from a stamper after imprinting utilizing an even bowing and the resilience of the stamper when imprinting, can respond to a switch to mass production by making it difficult for a defect to occur on the pattern surface of the substrate and stamper. A stamper is configured of a plate-shaped body whose Young's modulus is 50 GPa or more, 500 GPa or less, whose thickness is 200 ?m or more, 1000 ?m or less, and which has a bow with a curvature of 2×10?5 or more, 2×10?3 or less, wherein a microstructure pattern to be transferred is provided on one surface.Type: ApplicationFiled: March 9, 2010Publication date: December 30, 2010Applicant: FUJI ELECTRIC DEVICE TECHNOLOGY CO. LTD.Inventor: Shinji UCHIDA
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Publication number: 20100314247Abstract: A filtered cathodic arc device includes a plasma generating module which generates plasma using an arc discharge which has a cathode target as a deposition raw material; a deposition processing chamber in which a deposition receiving substrate is placed; a curved magnetic field duct that is placed between the plasma generating module and the deposition processing chamber, and that guides plasma generated by the plasma generating module to the deposition processing chamber with a magnetic field; a wool medium formed of a nonmagnetic metal fiber which covers the interior wall of the magnetic field duct; and a bias power source for the wool medium. The device balances reduction of particulate particles and a high deposition rate.Type: ApplicationFiled: May 5, 2010Publication date: December 16, 2010Applicant: Fuji Electric Device Technology Co., Ltd.Inventors: Shinya Takashima, Masanori Ooto, Yoshiyuki Yonezawa
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Publication number: 20100308496Abstract: A method of manufacturing a stamper for nanoimprinting is provided which enables formation of finer patterns and which can be executed inexpensively. The method includes a step of forming a metal thin film on the surface of a substrate; a step of forming a resist layer on the surface of the metal thin film; a step of forming a relief pattern in the resist layer in use of an electron beam lithography method; a step of etching the metal thin film in imitation of the relief pattern in the resist layer, and forming a pattern-shaped metal mask; and, a step of forming a relief pattern on the substrate in imitation of the metal mask. In step (d), by side-etching the metal thin film, the width of the protruding portions formed in the substrate in step (e) are reduced to be less than the width of the depression portions of the relief pattern formed in step (c).Type: ApplicationFiled: March 8, 2010Publication date: December 9, 2010Applicant: FUJI ELECTRIC DEVICE TECHNOLOGY CO., LTDInventor: Shinji UCHIDA
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Publication number: 20100233515Abstract: A perpendicular type of magnetic recording medium has a multi-layered recording structure made up of a plurality of ferro-magnetic layers and a non-magnetic layer interposed between the plurality of ferro-magnetic layers, and the perpendicular magnetic anisotropy energy of the lower ferro-magnetic layer is greater than the perpendicular magnetic anisotropy energy of the upper ferro-magnetic layer. Accordingly, the lower ferro-magnetic layer may be easily magnetically reversed by a magnetic field applied during a write operation. Thus, the perpendicular type of magnetic recording medium exhibits an enhanced thermal stability and write-ability.Type: ApplicationFiled: March 12, 2010Publication date: September 16, 2010Applicants: SAMSUNG ELECTRONICS CO., LTD., FUJI ELECTRIC DEVICE TECHNOLOGY CO., LTD.Inventors: Sok-hyun Kong, Hoo-san Lee, Sadayuki Watanabe, Shunji Takenoiri