摘要:
In order to obtain a magneto-impedance type magnetic sensor having a soft magnetic film facing to a conductive nonmagnetic film, and available a large impedance change with a carrier signal at a relatively low frequency, the magnetic sensor comprises a meander type conductive nonmagnetic thin film of zigzag shape formed with at least one pair of electrode terminals at both ends and a soft magnetic film which is strip-shaped so as to face thereto at a plurality of regions and has an easy axis of magnetization in a width direction of the strip shape, a high frequency carrier signal is applied to the above-mentioned electrode terminals and further a direct current bias magnetic field is applied. By performing AM detection of an AM modulation signal output from the above-mentioned electrode terminals, an impedance change of the conductive nonmagnetic film which is changed by external magnetic field is detected as a change of the high frequency carrier signal, thereby the external magnetic field can be detected.
摘要:
A shielded magnetic head includes a magnetically shielded gap and first to fourth conductive magnetic films disposed in the gap. The first to fourth conductive magnetic films, each extending parallel to a tip face of a magnetic head to be opposed to a magnetic recording medium, are aligned at a distance from one another in a direction perpendicular to the tip face so as to be away from the tip face in ascending order and connected to one another so as to form a bridge circuit. The distance between the first conductive magnetic film and the tip face is set so that a signal magnetic field from the magnetic recording medium is applied to the first conductive magnetic film. By canceling impedance components that do not vary depending on a magnetic field, the shielded magnetic head detects only impedance components that vary depending on a signal magnetic field.
摘要:
In a high-frequency impedance type magnetic head having high impedance and capable of efficiently detecting a change in impedance, an electrically conductive metal film is sandwiched between two soft magnetic films, and the two soft magnetic films form a portion of a magnetic path. The thickness of one soft magnetic film is smaller than the thickness of the other soft magnetic film. The electrically conductive metal thin film has a pair of electrodes at respective ends thereof, to which are connected an oscillator for applying a high frequency carrier signal to the electrodes and a high frequency amplifier having a demodulator circuit. Further, an electrically conductive metal film winding is provided, and a DC current is applied to the electrically conductive metal film winding at the time of reproduction, while on the other hand, a signal current is applied to the electrically conductive metal film winding at the time of recording.
摘要:
A magnetic head sensing apparatus includes a first, second and third magnetic core of a soft magnetic film formed by a thin film forming method. One end of the first and second magnetic core face a magnetic recording medium and are disposed with a predetermined distance therebetween field. The third magnetic core is disposed between the first and second magnetic cores. A conductive coil is wound around the third magnetic core. A conductive wire passes through the third magnetic core and is insulated therefrom. A DC-biased high-frequency constant current flows through the conductive wire to reproduce information recorded on the magnetic recording medium. Also, a recording signal is applied to the conductive coil sense the magnetic field.
摘要:
A magnetic head unit of the present invention is provided with a magnetic head having a magnetic impedance element, and a head suspension for suspending the magnetic head is provided with a matching transmission line of one-fourth wavelength for transmitting a high-frequency signal output from the magnetic head.
摘要:
In a high-frequency impedance type magnetic head having high impedance and capable of efficiently detecting a change in impedance, an electrically conductive metal film is sandwiched between two soft magnetic films, and the two soft magnetic films form a portion of a magnetic path. The thickness of one soft magnetic film is smaller than the thickness of the other soft magnetic film. The electrically conductive metal thin film has a pair of electrodes at respective ends thereof, to which are connected an oscillator for applying a high frequency carrier signal to the electrodes and a high frequency amplifier having a demodulator circuit. Further, an electrically conductive metal film winding is provided, and a DC current is applied to the electrically conductive metal film winding at the time of reproduction, while on the other hand, a signal current is applied to the electrically conductive metal film winding at the time of recording.
摘要:
A magnetic head includes a first, second and third magnetic core of a soft magnetic film formed by a thin film forming method. One end of the first and second magnetic core face a magnetic recording medium and are disposed with a predetermined distance therebetween. The third magnetic core is disposed between the first and second magnetic cores. A conductive coil is wound around the third magnetic core. A conductive wire passes through the third magnetic core and is insulated therefrom. A DC-biased high-frequency constant current flows through the conductive wire to reproduce information recorded on the magnetic recording medium. Also, a recording signal is applied to the conductive coil.
摘要:
The present invention relates to a magnetic head for recording and reproducing signals from a magnetic recording medium, wherein the magnetic head comprises a stylus having a pair of electrodes, a conductive multilayer film having a staircase-shaped section, and a magnetic body formed on the multilayer film. The magnetic head further comprises an excitation conductive thin film disposed so as to surround the stylus, a magnetic yoke forming a closed magnetic loop together with a magnetic recording medium and the stylus, and an anti-abrasive film formed on the magnetic yoke so as to oppose the recording medium. During recording, a signal current is supplied to the excitation conductive thin film to generate a recording magnetic field from the end of the stylus. During reproduction, a high-frequency voltage is applied across the electrodes, and a magnetic impedance change of the stylus, caused by a signal magnetism on the recording medium, is detected. The relative position of the magnetic head to the recording medium is controlled by deflecting a cantilever according to a capacitance between the magnetic head and the recording medium. Accordingly, the magnetic head of the present invention is capable of remarkably enhancing recording densities and data transfer rates.
摘要:
In the magnetic recording characteristics of recording apparatus, when there are three or more magnetic tips disposed on one head base, the extension lines in the depth direction of the head tips pass through the central line of the cylinder. The both outermost head tips on the head base disposed in one window of the cylinder possess head gaps as dummy head, but do not have the function of magnetic recording characteristics of recording, reproducing and erasing. In the disclosed multiple magnetic head, the materials of the head tips on one head base including the dummy head are the same.
摘要:
A magnetic head includes magnetic cores formed by sputter layers of an amorphous magnetic alloy formed on a non-magnetic substrate (1). A non-magnetic ceramic layer is provided on one amorphous magnetic alloy layer, and a non-magnetic substrate is bonded thereon by a bonding glass layer. The one amorphous magnetic alloy sputter layer is isolated from the bonding glass layer by the non-magnetic ceramic layer to prevent the quality of the bonding glass layer from deteriorating thus a stronger bonding force is maintained. The bonding of the amorphous ceramic layer with respect to the one amorphous magnetic alloy layer is strong, thus providing a magnetic head having high reliability.