Авторы: T. Uchiyama, K. Mohri, Life Fellow, Y. Honkura, L. Panina

2012 г.

IEEE TRANS. ON MAGNETICS

     We have developed sensitive micro magnetic sensors referred to as MI sensors based on magneto-impedance effect in amorphous wires and CMOS IC electronic circuits providing a sharp-pulse excitation. Micro sized MI-HIC chips have been in mass production of electronic compasses by Aichi Steel Corp. since 2002 for mobile phones and since 2010 for smart phones. Recently we have realized pico-Tesla ( Oe) resolution for microMI sensors making use of ultralow intrinsic magnetic noise in amorphous wires with the pulse magnetoimpedance effect. The pico-Tesla MI sensor is useful especially for bio-magnetic measurements without any magnetic shielding at room temperature. In order to avoid a risk of traffic accident due to noise reduction electric vehicles, an alert systemfor the pedestrians having a smart phone would be useful, if pico-Tesla MI sensor were built in the smart phones.

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