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公开(公告)号：CA1268827A
公开(公告)日：1990-05-08
申请号：CA483024
申请日：1985-06-03
Applicant: SONY CORP
Inventor： MURAKAMI YOSHIKAZU , ITO SEIGO , YAMADA TOSHIRO
Abstract: A tuned oscillator is disclosed which comprises an active element, a resonator electrically connected to the active element and made of a magnetic material using ferromagnetic resonance phenomenon, and a magnetic circuit for applying a magnetic field to the resonator. The resonator is made of an YIG (yttrium, iron and garnet) thin film magnetic resonance element formed by a thin film forming technique and utilizes an uniform mode ferro-magnetic resonance in the YIG thin film, and operating under the application of magnetic field of the magnetic circuit.
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公开(公告)号：DE3381184D1
公开(公告)日：1990-03-08
申请号：DE3381184
申请日：1983-09-26
Applicant: SONY CORP
Inventor： KANEKO MASAHIRO , TAMADA HITOSHI , OKAMOTO TSUTOMU , YAMADA TOSHIRO
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公开(公告)号：AU4093478A
公开(公告)日：1980-04-24
申请号：AU4093478
申请日：1978-10-20
Applicant: SONY CORP
Inventor： HIMURO MASAMI , YAMADA TOSHIRO , MAKINO YOSHIMI
Abstract: A pick-up device for reading out information which has been recorded on a magnetic medium. The device comprises a substrate and a layer of soft magnetic material overlying a surface of the substrate, the easy axis or direction of magnetization being normal to the surface and the magnetic material having properties capable of having magnetic bubble domains generated and propagated therein, so that when the pick-up device is used to read out information from a magnetic medium, patterns of magnetic domains are formed in the layer of magnetic material corresponding to the patterns of the recorded information. Although the magnetic material is of the type capable of having magnetic bubble domains generated and propagated therein, there is no need to provide the usual bias field for maintaining the bubble domains or for providing domain-transport or domain-annihilating fields. In one use of the pick-up device, light is transmitted through the substrate and through the layer of magnetic material to be reflected from a layer of light-reflective material back through the magnetic material and the substrate, whereby the polarization of the reflected light is rotated, relative to the polarization of the transmitted light, by an amount determined by the patterns of magnetic domains formed in the layer of magnetic material. Hence, the recorded information can be optically read from the magnetic medium. In another use of this device, a magnetoresistive head is disposed on the substrate, the resistance of this magnetoresistive head being varied as a function of the patterns of magnetic domains formed in the layer of magnetic material.
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公开(公告)号：EP0129605A4
公开(公告)日：1987-01-22
申请号：EP84900111
申请日：1983-12-20
Applicant: SONY CORP
Inventor： KANEKO MASAHIKO SONY CORPORATI , TAMADA HITOSHI , OKAMOTO TSUTOMU , YAMADA TOSHIRO
IPC: G11B11/105 , G11B5/02
CPC classification number: G11B11/10504 , G11B11/10515 , G11B11/10536 , G11B11/10589
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公开(公告)号：CA1266101A
公开(公告)日：1990-02-20
申请号：CA513293
申请日：1986-07-08
Applicant: SONY CORP
Inventor： MURAKAMI YOSHIKAZU , TANAKA HIDEO , MIYAKE MASAMI , ITO SEIGO , TAMADA HITOSHI , YAMADA TOSHIRO
Abstract: A YIG film microwave device utilizing the ferrimagnetic resonance of a YIG film, comprising a YIG film microwave element formed by a liquid phase epitaxial growth process and a photolithographic process, and a magnetic circuit including permanent magnets for applying a DC magnetic field to the YIG film microwave element. Some of the Fe3+ ions of the YIG film are substituted by nonmagnetic ions to provide the YIG film microwave device with satisfactory temperature characteristics. The YIG film microwave device is capable of operating stably over the wide range of working frequency and that of temperature.
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Patent Agency Ranking
公开(公告)号：DE3586805T2
公开(公告)日：1993-05-06
申请号：DE3586805
申请日：1985-06-04
Applicant: SONY CORP
Inventor： MURAKAMI YOSHIKAZU , ITO SEIGO , YAMADA TOSHIRO
Abstract: A signal converter is disclosed which comprises a filter (2) formed of a first ferromagnetic resonator supplied with a input signal to be converted and deriving a filtered signal having a first frequency, a local oscillator (5) formed of an active element and a second ferromagnetic resonator connected to the active element, deriving an oscillating signal having a second frequency, a mixer (4) mixing the filtered signal and said oscillating signal and deriving a converted signal, the first ferromagnetic resonator being formed of a first ferrimagnetic crystal, a microstrip line magnetically coupled to the ferrimagnetic crystal and first D.C. bias magnetic field means applying a first D.C. bias magnetic field to the first ferrimagnetic crystal, the second ferromagnetic resonator being formed of a second ferrimagnetic crystal, a microstrip line magnetically coupled to the second ferrimagnetic crystal, and second D.C. bias magnetic field means applying a second D.C. bias magnetic field to the second ferrimagnetic crystal. The first and second ferrimagnetic crystal is composed of ferrimagnetic thin films such as YIG film formed by a thin film forming technique, such as, liquid phase epitaxial growth.
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公开(公告)号：DE3687929D1
公开(公告)日：1993-04-15
申请号：DE3687929
申请日：1986-07-09
Applicant: SONY CORP
Inventor： MURAKAMI YOSHIKAZU , TANAKA HIDEO , MIYAKE MASAMI , ITOH SEIGO , TAMADA HITOSHI , YAMADA TOSHIRO
Abstract: YIG film microwave apparatus, utilising the ferrimagnetic resonance of a YIG film, comprises a YIG film microwave device (1) formed by a liquid phase epitaxial growth process and a photolithographic process, and a magnetic circuit (2) including permanent magnets (4) for applying a DC magnetic field to the YIG film microwave device (1). The Fe ions of the YIG film are partially substituted by nonmagnetic ions to provide YIG film microwave apparatus with satisfactory temperature characteristics. The YIG film microwave apparatus is capable of operating stably over wide ranges of working frequencies and temperatures.
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公开(公告)号：CA1212757A
公开(公告)日：1986-10-14
申请号：CA437179
申请日：1983-09-21
Applicant: SONY CORP
Inventor： KANEKO MASAHIKO , TAMADA HITOSHI , OKAMOTO TSUTOMU , YAMADA TOSHIRO
Abstract: A thermomagnetic recording method is disclosed which includes the steps of providing a layer of soft magnetic material having an easy axis of magnetization normal to the layer and being of the type of magnetic material in which magnetic bubble domains can be generated, applying bias magnetic field to the layer, strength of the magnetic field being selected between the run-out field and the collapse field, and applying an optical beam to the layer so as to form a bubble domain having magnetization opposite in direction to the bias field, the layer of the soft magnetic material having selected values , ?, h, Hc and Ms to satisfy the relation wherein Hc is the coercive force of the layer, Ms is the saturation magnetization of the layer, h is the thickness of the layer, .sigma.w is domain wall energy, d is the diameter of the generated domain, each of CM and C.sigma. is a constant determined by h, d and ? where .
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公开(公告)号：AU522038B2
公开(公告)日：1982-05-13
申请号：AU4093478
申请日：1978-10-20
Applicant: SONY CORP
Inventor： HIMURO MASAMI , YAMADA TOSHIRO , MAKINO YOSHIMI
Abstract: A pick-up device for reading out information which has been recorded on a magnetic medium. The device comprises a substrate and a layer of soft magnetic material overlying a surface of the substrate, the easy axis or direction of magnetization being normal to the surface and the magnetic material having properties capable of having magnetic bubble domains generated and propagated therein, so that when the pick-up device is used to read out information from a magnetic medium, patterns of magnetic domains are formed in the layer of magnetic material corresponding to the patterns of the recorded information. Although the magnetic material is of the type capable of having magnetic bubble domains generated and propagated therein, there is no need to provide the usual bias field for maintaining the bubble domains or for providing domain-transport or domain-annihilating fields. In one use of the pick-up device, light is transmitted through the substrate and through the layer of magnetic material to be reflected from a layer of light-reflective material back through the magnetic material and the substrate, whereby the polarization of the reflected light is rotated, relative to the polarization of the transmitted light, by an amount determined by the patterns of magnetic domains formed in the layer of magnetic material. Hence, the recorded information can be optically read from the magnetic medium. In another use of this device, a magnetoresistive head is disposed on the substrate, the resistance of this magnetoresistive head being varied as a function of the patterns of magnetic domains formed in the layer of magnetic material.
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公开(公告)号：DE2845604A1
公开(公告)日：1979-05-03
申请号：DE2845604
申请日：1978-10-19
Applicant: SONY CORP
Inventor： HIMURO MASAMI , YAMADA TOSHIRO , MAKINO YOSHIMI
Abstract: A pick-up device for reading out information which has been recorded on a magnetic medium. The device comprises a substrate and a layer of soft magnetic material overlying a surface of the substrate, the easy axis or direction of magnetization being normal to the surface and the magnetic material having properties capable of having magnetic bubble domains generated and propagated therein, so that when the pick-up device is used to read out information from a magnetic medium, patterns of magnetic domains are formed in the layer of magnetic material corresponding to the patterns of the recorded information. Although the magnetic material is of the type capable of having magnetic bubble domains generated and propagated therein, there is no need to provide the usual bias field for maintaining the bubble domains or for providing domain-transport or domain-annihilating fields. In one use of the pick-up device, light is transmitted through the substrate and through the layer of magnetic material to be reflected from a layer of light-reflective material back through the magnetic material and the substrate, whereby the polarization of the reflected light is rotated, relative to the polarization of the transmitted light, by an amount determined by the patterns of magnetic domains formed in the layer of magnetic material. Hence, the recorded information can be optically read from the magnetic medium. In another use of this device, a magnetoresistive head is disposed on the substrate, the resistance of this magnetoresistive head being varied as a function of the patterns of magnetic domains formed in the layer of magnetic material.
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