H. Osada

Iwate University, Morioka, Iwate, Japan

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Publications (5)7.11 Total impact

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    ABSTRACT: The magnetic infrared sensor (MIS) is a detector utilizing the pyromagnetic effect of ferrimagnetic film (FMF) with a low Curie temperature. When infrared rays are absorbed by the MIS, there is a magnetization change in the sensor. This change is read out by a magnetoresistance element and is converted into a voltage with a peak value that increases with a rise in infrared energy. This paper describes the construction of the MIS, and characterization of infrared rays
    IEEE Transactions on Magnetics 10/1999; · 1.42 Impact Factor
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    ABSTRACT: The pyrophotosensor PPS with 1.0 μm-thickness is a device utilizing the magnetic property of a thermally-sensitive ferrimagnetic thin film with low Curie temperature. The conventional photomagnetic semiconductor using a thick film with 55 μm-thickness has a slow response and a large size, while the PPS is characterized by a quick pulse response and a high sensitivity. When light is radiated to the PPS, the PPS absorbs light energy which causes the reluctance change to the PPS. The reluctance change can be read out by a magnetoresistive element and it is converted into voltage of which the peak value grows with an increase in illuminance. The PPS is useful as a magnetic sensor as an alternative to electric photosensors
    IEEE Transactions on Magnetics 08/1998; · 1.42 Impact Factor
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    ABSTRACT: We propose a contactless power transmission system using a new meander type coil. Effectiveness for stabilizing the amount of the transmitted power against a load displacement and suppressing electromagnetic noise emission is the features of meander type coils. Maximum power is transmitted when the pitch of the transmitter coil corresponds to the receiver shape. An Active Excitation System was realized using circuit in which the relative position between transmitter and receiver coils are always assured. Furthermore the system result is an optimal distribution of flux. Therefore, the receiver position is cleared and transmitter-pitch is set up optimally
    IEEE Transactions on Magnetics 08/1998; · 1.42 Impact Factor
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    ABSTRACT: Starting and driving methods of contactless power transmission to electric vehicles are proposed. By employing rectangular and spiral coils for primary and secondary windings, respectively, for a contactless power station (CLPS), over 200 W of electric power was transmitted to the authors' fabricated EV motor setup and verified its actual operation on it. The EV is a compact prototype driven by CLPS, loaded with a lightweight battery. The battery supplies a part of transient current arising from starting and acceleration of EV. The CLPS-powered prototype could actually be driven at 30 km/h for an overall energy consumption of 100 W. Driving tests with and without CLPS using a “10-mode” driving schedule were executed and compared
    IEEE Transactions on Magnetics 10/1997; · 1.42 Impact Factor
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    ABSTRACT: A temperature-sensitive magnetic thin-film (TMT) is made by sputtering Mn-Zn ferrite. Temperature-sensitive magnetic cores and thick-films have already been fabricated, however a magnetic thin-film with temperature dependence has not been shown yet. The authors developed a TMT by a new method with RF sputtering of a TMT utilizing a low Curie temperature Mn-Zn ferrite core as a target. The TMT with quick thermal response can be used as a micro temperature sensor, a thermomagnetic transducer or a photomagnetic device
    IEEE Transactions on Magnetics 12/1995; · 1.42 Impact Factor