Abstract: Disclosed is a magnetic recording medium, which comprises a metal magnetic thin film formed on a nonmagnetic support member, surface resistivity of the metal magnetic thin film is in the range of 1×103 ?/sq.-1×107 ?/sq., a value of Mr·t (a product of amount of residual magnetization (Mr) and film thickness (t)) is within the range of 4 mA-13 mA, and amount of residual magnetization (Mr) is within the range of 160 kA/m-360 kA/m. As a result, in the reproduction using GMR head, it is possible to suppress noise and to prevent saturation of GMR head and electrostatic destruction.

Abstract: A head substrate and a protective substrate are formed of an electrostatic-discharge resistant conductive material having an electrical resistivity of 102 to 1010 ?cm. These substrates are electrically connected to a base metal through the use of conductive paste and are set to a ground potential via the base metal and a rotating drum. This suppresses a discharge current flowing through an MR element when an electrostatically charged substance touches or approaches a magnetic reproducing head, a terminal, a conducting wire, etc. to generate an electrostatic discharge. The magnetic reproducing head including an MR element and the like is prevented against an electrostatic discharge damage. It is possible to provide the magnetic reproducing head, a head drum apparatus, and a magnetic recording-reproducing apparatus which can highly effectively prevent an electrostatic discharge damage.

Abstract: Disclosed is a magnetic recording medium, which comprises a metal magnetic thin film formed on a nonmagnetic support member, surface resistivity of the metal magnetic thin film is in the range of 1×103 &OHgr;/sq.-1×107 &OHgr;/sq., a value of Mr·t (a product of amount of residual magnetization (Mr) and film thickness (t)) is within the range of 4 mA-13 mA, and amount of residual magnetization (Mr) is within the range of 160 kA/m-360 kA/m. As a result, in the reproduction using GMR head, it is possible to suppress noise and to prevent saturation of GMR head and electrostatic destruction.

Abstract: A low-loss bipolar transistor comprising a collector layer composed of an n++ Si substrate and n− Si film, a base layer composed of a p− SiGe film, an emitter layer composed of an n+ Si film, a base electrode, an emitter electrode, a collector electrode, and an insulating material to coat the exposed surface including the junction boundary of the base layer and collector layer, wherein when a total length of contact boundary per unit area in the area where the emitter electrode and base electrode are adjacently arranged is assumed to be X (mm/cm2) and the dopant density of the emitter layer is assumed to be Y (atom/cm3), the expressions X≧500 and Y≧9.0×1018−3.2×1015 X are satisfied.

Abstract: A diode of the present invention has a Si substrate, a Si film of a first conductivity type laminated on this Si substrate, and a SiGe film of a second conductivity type laminated on this first conductivity type Si film.

Abstract: A head substrate and a protective substrate are formed of an electrostatic-discharge resistant conductive material having an electrical resistivity of 102 to 1010 &OHgr;cm. These substrates are electrically connected to a base metal through the use of conductive paste and are set to a ground potential via the base metal and a rotating drum. This suppresses a discharge current flowing through an MR element when an electrostatically charged substance touches or approaches a magnetic reproducing head, a terminal, a conducting wire, etc. to generate an electrostatic discharge. The magnetic reproducing head including an MR element and the like is prevented against an electrostatic discharge damage. It is possible to provide the magnetic reproducing head, a head drum apparatus, and a magnetic recording-reproducing apparatus which can highly effectively prevent an electrostatic discharge damage.

Abstract: This invention relates to a magnetic head device and a disk drive, which are suitable for application to a mass-storage floppy disk drive. A first and second rails are provided on the disk side in projected form on a slider of each of magnetic head elements 20 so as to extend in a tangential direction R of a track of the disk and be parallel with each other. A head chip for recording and reproducing data in a state of being in contact with a recording surface of the disk and in a standard recording density is provided substantially in the central position of the first rail. Another head chip for recording and reproducing data in a state of being levitated from the recording surface of the disk and in a high recording density is provided in a position on the rear side of the second rail 26b with respect to the tangential direction R of the track. A width of the first rail of each magnetic head element is narrower than a width of the second rail thereof.

Abstract: This invention relates to a magnetic head device and a disk drive, which are suitable for application to a mass-storage floppy disk drive or the like. A first and a second rails are provided on the disk side in projected form on a slider of each of magnetic head elements 20 so as to extend in a tangential direction R of a track of the disk and be parallel with each other. A head chip for recording and reproducing data in a state of being in contact with a recording surface of the disk and in a standard recording density is provided substantially in the central position of the first rail. Another head chip for recording and reproducing data in a state of being levitated from the recording surface of the disk and in a high recording density is provided in a position on the rear side of the second rail 26b with respect to the tangential direction R of the track. A width of the first rail of each magnetic head element is narrower than a width of the second rail thereof.

Abstract: This invention relates to a magnetic head device and a disk drive, which are suitable for application to a mass-storage floppy disk drive or the like. A first and a second rail are provided on the disk side in projected form on a slider of each of magnetic head elements 20 so as to extend in a tangential direction R of a track of the disk and be parallel with each other. A head chip for recording and reproducing data in a state of being in contact with a recording surface of the disk and in a standard recording density is provided substantially in the central position of the first rail. Another head chip for recording and reproducing data in a state of being levitated from the recording surface of the disk and in a high recording density is provided in a position on the rear side of the second rail 26b with respect to the tangential direction R of the track. A width of the first rail of each magnetic head element is narrower than a width of the second rail thereof.

Abstract: A magnetic disc apparatus capable of selectively driving at least two types of the magnetic discs having signal recording portions on their major surfaces and having different recording densities. The magnetic disc apparatus includes a main head carriage mounted for movement on a base block, a supporting arm having its one end supported by a main head carriage, and a magnetic head having a first transducer having a slider, and a first core and adapted for accessing information signals at a first recording density, and a second transducer having a second core and adapted for accessing information signals at a second recording density higher than the first recording density. A magnetic gap for the first transducer and a magnetic gap for the second transducer are formed on the surface of the magnetic head facing the major surface of the magnetic disc.

Abstract: A magnetoresistance effect type magnetic head apparatus has a magnetoresistance effect sensing element, means for applying a bias magnetic field to the sensing element, a detecting circuit for obtaining a detecting signal, a low pass filter for deriving an unwanted signal component from the detecting signal, and means for applying a cancelling magnetic field to the sensing element so as to eliminate the unwanted signal component. An additional sensing element may also be provided to detect an external magnetic field, and a corresponding signal is generated which is applied to a first sensing element so as to cancel the effects of the external magnetic field.

Abstract: A magnetic transducer head utilizing magnetoresistance effect having a circuit for applying a constant voltage to outer ends of at least one pair of magnetoresistance effect elements provided in series on a discontinuous portion other than a magnetic gap of a magnetic core forming a magnetic gap and a conductor arrangement for applying bias magnetic fields opposite in polarity to the magnetoresistance effect elements, respectively wherein an output is derived from a connected point between the pair of magnetoresistance effect elements.