Ferrotec Corporation

Yasutake Hirota

Takayuki Hachida

Kenichi Katsuma

Masatake Hirooka

A magnetic member includes a plurality of superparamagnetic particles held by the magnetic member. Each of the plurality of superparamagnetic particles is formed with a particle size which is set at least such that a Neel relaxation time &#x3c4;n in the each of the superparamagnetic particles becomes shorter than a cycle P of an alternating current magnetic field applied to the magnetic member (&#x3c4;n&#x3c;P) when the magnetic member is used as an electronic component.

Magnetic member and electronic component

A current sensor according to the present invention includes a sensor element and a detector. The sensor element includes a core member, an exciting coil and a detection coil. The sensor element is configured such that, while the exciting coil is fed with an excitation signal, comprising a fundamental component, and when the signal to be detected flows, a signal, including a harmonic component, corresponding to the permeability &#x3bc; of the core member at that point, being superposed on the fundamental component, is outputted from the detection coil. The detector includes a component extraction unit, a level specification unit, and an information output unit.

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Chuo-ku, Japan

Yasutake Hirota