Magneto-impedance element and magneto-impedance sensor including detection coil
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United States of America Patent
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Feb 19, 2013
Grant Date -
Feb 14, 2013
app pub date -
Oct 2, 2008
filing date -
Oct 2, 2007
priority date (Note) -
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Abstract
A magneto-impedance element includes a magnetic sensitive member having a form of a line, whose electromagnetic characteristics vary depending on an external magnetic field, a pulse current flowing from one to another end portion thereof in an axial direction. A conductive layer is arranged on an insulating layer provided on an outer surface of the magnetic sensitive member. A connection portion, electrically connecting the magnetic sensitive member and the conductive layer, is arranged on the other end portion in the axial direction of the magnetic sensitive member. A detection coil, outputting an induced voltage corresponding to an intensity of an external magnetic field acting on the magnetic sensitive member when the pulse current flows in the magnetic sensitive member, is wounded around the conductive layer. A direction of the pulse currents flowing in the magnetic sensitive member and in the conductive layer are opposite each other.
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