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41. 发明专利

JPH059020A SUPERCONDUCTING PARTS FOR HIGH-FREQUENCY 失效
公开(公告)号：JPH059020A
公开(公告)日：1993-01-19
申请号：JP9468991
申请日：1991-04-01
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： ISHII OSAMU , ITO KEIICHIRO , NAGAI YASUHIRO , KIMACHI YOSHIHIRO
IPC分类号： C01G1/00 , C01G3/00 , C04B41/81 , H01L39/00 , H01Q1/40
摘要： PURPOSE:To suppress deterioration with the lapse of time by coating the surface of a superconductor material with a chemically stable insulator. CONSTITUTION:A superconductor material made of an oxide having a super- conducting state at low temp. is immersed in a soln. contg. a fluorocarbon type org. substance and an inorg. oxide selected from glass, alumina, magnesia and tantalum oxide, the solvent is removed and the surface of the superconductor material is coated with a chemically stable insulator.

42. 发明专利

JPH04373202A OXIDE SUPERCONDUCTING MICROWAVE DEVICE 失效
公开(公告)号：JPH04373202A
公开(公告)日：1992-12-25
申请号：JP17589891
申请日：1991-06-21
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NAGAI YASUHIRO , ISHII OSAMU , ITO KEIICHIRO , SUZUKI TAKAFUMI
IPC分类号： H01P1/203 , H01P3/08 , H01P7/08
摘要： PURPOSE:To realize the oxide superconducting microwave device with high performance and high reliability in which the frequency adjustment or the performance adjustment at mount is facilitated. CONSTITUTION:A thin fluororesin thin film 18 is filled in a gap 16 between an upper board including an upper ground lane 12 and an intermediate board 13 including a center conductor 11 to assemble the strip line structure of the oxide superconducting microwave device. Thus, an undesired gap for close adhesion is eliminated by smoothing a mechanical contact face between the upper board 14 and the intermediate board 13. Since the gap 16 is filled by using the fluororesin thin film 18 having a larger dielectric constant than that of air, a change in the effective dielectric constant around the center conductor 11 is suppressed.

43. 发明专利

JPH04163808A MANUFACTURE OF SUPERCONDUCTIVE DEVICE 失效
公开(公告)号：JPH04163808A
公开(公告)日：1992-06-09
申请号：JP28858290
申请日：1990-10-29
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TERADA AKIRA , KIMACHI YOSHIHIRO , NAGAI YASUHIRO
IPC分类号： H01L39/24 , H01B12/06 , H01B13/00
摘要： PURPOSE:To prevent degradation due to fabrication of a superconductive film and to obtain a superconducting device with high quality by fabricating a substrate surface into a pattern shape prepared in advance and, forming an oxide superconductive film on the projection surface of the processed surface. CONSTITUTION:A device pattern 2B prepared in advance is formed on a surface of a SrTiO3 substrate 2 by a separation processing. Then, an oxide superconductive film 1A is formed on the projection surface of the processed substrate 2 by means of epitaxial growth. Degradation of superconductive characteristics in the edge side of the pattern due to ions collision can be prevented because no processing is added to such a superconductive film 1A. Furthermore, since no resist is applied to the surface of the superconductor, oxygen plasma arcing becomes unnecessary, degradation of superconductive characteristics in surface and side of the pattern due to excess or insufficiency of oxygen is not generated. High quality superconducting device can be obtained accordingly.

44. 发明专利

JPH0496383A MANUFACTURE OF OXIDE SUPERCONDUCTING DEVICE 失效
公开(公告)号：JPH0496383A
公开(公告)日：1992-03-27
申请号：JP21417090
申请日：1990-08-13
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NAGAI YASUHIRO , TSURU KOJI , KOSHIMOTO YASUHIRO
IPC分类号： H01L39/24
摘要： PURPOSE:To introduce a pin for suppressing movement of flux to a thin oxide superconductor film, to increase a critical current density and to reduce noise of 1/f by excessively supplying oxygen to the thin film, and then reducing part of the oxygen in the film. CONSTITUTION:Excess oxygen is supplied to an oxide superconductor pattern 2 formed in a device pattern, for example, by an oxygen plasma 3 generated by a high frequency excitation or an oxygen ion beam 4 generated by an ion source, etc., through steps of a thin oxide superconductor film 2 before a device processing or a photolithography, etc. Then part of excess oxygen in the film is reduced. As a reducing method of this case, a heat treatment at 500 deg.C for a short time, irradiation with Ar, N2 ions, etc., is employed. A microscopic structure change of a pin, etc., can be generated in the film thereby to suppress movement of flux, etc., in the film, a high critical current density is maintained even in a magnetic field, thereby forming the thin film having small 1/f noise.

45. 发明专利

JPH0496284A PROCESSING METHOD FOR OXIDE SUPERCONDUCTOR 失效
公开(公告)号：JPH0496284A
公开(公告)日：1992-03-27
申请号：JP20684490
申请日：1990-08-06
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TERADA AKIRA , NAGAI YASUHIRO , SUZUKI TAKAFUMI , TSURU KOJI
IPC分类号： H01L39/24 , H01P3/08 , H01P11/00
摘要： PURPOSE:To enhance performance of a device, to suppress an irregularity in performance due to processing deterioration and to improve controllability of a device performance by simultaneously irradiating with reducing ions when the residue of an organic resist used for a mask is ashed by oxygen plasma to be removed. CONSTITUTION:When an oxygen plasma ashing is conducted by an RF oxygen plasma generator, an argon ion beam is, for example, raster-scanned from a differential evacuation type raster scan argon ion gun 2 to a sample 1 to be processed having residual resist on the surface, and the entire surface of the sample 1 is irradiated with the beam. Accordingly, since oxygen excessively supplied by an oxygen plasma irradiating is removed by irradiating it with reducing ions such as argon, nitrogen, etc., a function of removing rigid residual resist and a function of suppressing deterioration of superconducting characteristic can be compatible.

46. 发明专利

JPH0487384A OXIDE SUPER CONDUCTIVE QUANTUM INTERFERING DEVICE 失效
公开(公告)号：JPH0487384A
公开(公告)日：1992-03-19
申请号：JP20225890
申请日：1990-07-30
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NAGAI YASUHIRO , TSURU KOJI , SERIKAWA TADASHI , SHIRAI SEIICHI
IPC分类号： H01L39/22
摘要： PURPOSE:To make it possible to provide, at comparatively reasonable price, a compact, high-performance, and highly reliable quantum interfering device which features noise reduction and simple shielding, and eliminates the necessity of bonding by forming a superconductive loop and superconductive coil on a substrate, and by connecting the superconductive loop and amplification circuit through thin-film signal wiring. CONSTITUTION:A superconductive quantum interfering device (a) is constituted by a superconductive input coil 3 and a superconductive loop 2, and others, centering on oxide superconductive films, on a substrate made of single crystal inductor composed of NgO or SrTiO3. On the same substrate, a front-placed amplification element (b) is made, centering on multi-crystal silicon. Two devices of (a) and (b) can be housed in the region with approximately 600X600 micron. Therefore, the size of the whole quantum interfering device does not increase, even if front-placed amplification elements increase and are installed on the same substrate. As a result, reasonable-price FET elements, which can move even in 77K, can be constituted as a whole on the same substrate, and signal wiring can be remarkably reduced, and generation of noises from the outside or inductive noises can be restrained.

47. 发明专利

JPH03291009A VARIABLE DELAY ELEMENT 失效
公开(公告)号：JPH03291009A
公开(公告)日：1991-12-20
申请号：JP9226890
申请日：1990-04-09
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： ISHII OSAMU , NAGAI YASUHIRO , KOSHIMOTO YASUHIRO
IPC分类号： H01F27/00 , H01B12/02 , H01L39/00 , H03H7/30
摘要： PURPOSE:To provide a required delay without a loss by applying a prescribed magnetic field being a critical magnetic field or over to a magnetic pole face having a proper negative pattern of a superconducting plate. CONSTITUTION:When a magnetic field generated at a magnetic face 111 of a variable delay element is a critical magnetic field Hc or over, only the hatched part in a wiring pattern 14 in a superconducting plate 10 in the magnetic pole face 111 of a negative pattern 141 are in a superconducting state. When an electromagnet 2 is not excited, the signal is delayed by a time when the signal is propagated between electrode terminals 3, 4 straightly and the signal passes the route shown in hatched lines when a magnetic field is applied, and the delay is increased. Then the strength of the inputted signal is constant within a measured error when the output of an oscillator is inputted directly to a sampling oscilloscope, and when the output is inputted to the sampling oscilloscope via a variable delay element, and no loss is offered.

48. 发明专利

JPH03183601A PRODUCTION OF OXIDE SUPERCONDUCTING FILM 失效
公开(公告)号：JPH03183601A
公开(公告)日：1991-08-09
申请号：JP31761889
申请日：1989-12-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NAGAI YASUHIRO , TSURU KOJI , KOSHIMOTO YASUHIRO
IPC分类号： C01B13/14 , C01G1/00 , C01G29/00 , H01B12/06 , H01B13/00
摘要： PURPOSE:To obtain a high performance superconducting device utilizing the advantages of an oxide superconducting film by forming an oxide superconducting film on an MgO (110) single crystal substrate, coating the surface of the film with an MgO (110) single crystal and carrying out heat treatment. CONSTITUTION:A thin Bi-Sr-Ca-Cu oxide film 2 is deposited on a mirror pol ished MgO (110) single crystal substrate 1 by a vapor growth method or other method. The surface of the film 2 is coated with a mirror polished MgO (110) single crystal sheet 3 and heat treatment is carried out in an oxygen atmosphere. After this heat treatment, the sheet 3 is removed. The film 2 is converted into an oxide superconducting film for a superconducting device.

49. 发明专利

JPH0395474A MAGNETIC FIELD SENSOR 失效
公开(公告)号：JPH0395474A
公开(公告)日：1991-04-19
申请号：JP23313489
申请日：1989-09-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KOSHIMOTO YASUHIRO , NAGAI YASUHIRO , ITO KEIICHIRO
IPC分类号： G01R33/02
摘要： PURPOSE:To measure a low frequency magnetic field with a high S/N ratio by periodically applying a current of critical current density or more to the superconductive plate provided in a magnetic shield and selectively amplifying the frequency coinciding with the current frequency of a magnetoelectric converter. CONSTITUTION:A fixed shield 2 and variable shields 3, 4 are provided so as to cover a magnetoelectric converter 1 and the temp. of the shields 3, 4 is set to temp. slightly lower than superconductivity developing temp. and the current flowing to the shields 3, 4 from an AC current source 12 increases and, when the current value of the current exceeds a critical current value, superconductive characteristics break and susceptibility becomes zero and magnetic flux enters a magnetic field sensor. When the current value becomes the critical current value or less, superconductivity is again developed and the magnetic flux is discharged from the magnetic field sensor and the output from the converter 1 becomes one corresponding to a zero magnetic field. Since a low frequency magnetic field is subjected to AM modulation by the frequency of the current source 12, for example, when a magnetic field signal of DC - several Hz is modulated by a 10kHz AC current like a heart magnetic field and detected, said signal can be detected as a signal having a band of 10kHz + or - several Hz.

50. 发明专利

JPS61170918A MAGNETORESISTANCE EFFECT-TYPE MAGNETIC HEAD 失效
公开(公告)号：JPS61170918A
公开(公告)日：1986-08-01
申请号：JP1142085
申请日：1985-01-24
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YASUDA KYOSUKE , NAGAI YASUHIRO , TOSHIMA TOMOYUKI
IPC分类号： G11B5/39
摘要： PURPOSE:To narrow easily a track by arranging a thin film element having an magnetoresistance effect in a clearance between two thin film electrodes which are formed on the surface of a substrate. CONSTITUTION:The magnetic flux of a recording medium 5 is dierectly detected by a magnetoresistance effect-type magnetic head (MR head) through electrodes 4-1 and 4-2 as a change in the resistance of a region shown by (g') of a magnetic thin filmelement (MR element) 1. Namely, the MR element 1 can be provided with a magnetoresistance effect (MR effect) in the wide film thickness range 0.02-1mum. Since the width of a track in this case is equal to the thickness (t') of the MR element 1, the track can be easily narrowed. As rotating magnetization is utilized as the magnetization mechanism of the MR element 1, the frequency characteristic can be improved.

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