Development of High-Sensitivity Fluxgate Magnetometer Using Single-Crystal Yttrium-Iron Garnet Thick Film as the Core Material
ELECTRO MAGNETIC APPLICATIONS INC BOSTON MA
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Traditionally, a fluxgate sensor is made of metallic magnetic ribbons by which the second-order harmonics is characterized in relation to an imposed dc field. Resolution of the sensor device is limited by Barkhausen noise generated in the core region. In contrast to the conventional approach we propose to perform fluxgate operation coherently involving detection of the generated harmonics of all orders. As such, noise influence is minimized, since noise can only add to the detection scheme incoherently. In order to achieve this goal we choose to work with insulator cores, such as single-crystal yttrium-iron- garnet YIG thick films. In the absence of eddy-current damping, high-order harmonics are not attenuated in the core region, allowing them to be effectively included as coherent detection. Our long-term goals are to fabricate efficient fluxgate sensors using YIG films as the core material providing the following advantages reliability, ruggedness, and economy. Most importantly, we expect our new sensor devices would result in a sensitivity one or two orders superior to the existing devices.
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