Method for fabricating thin-film structure magnetizable bead detector
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United States of America Patent
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Jun 23, 2015
Grant Date -
Feb 5, 2009
app pub date -
Sep 26, 2008
filing date -
Oct 13, 1999
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Abstract
A ferromagnetic thin-film based magnetic field detection system used for detecting the presence of selected molecular species. A magnetic field sensor supported on a substrate has a binding molecule layer positioned on a side thereof capable of selectively binding to the selected molecular species held on a magnetic particle. The magnetic field sensor can be substantially covered by an electrical insulating layer having a recess therein adjacent to the sensor in which the binding molecule layer is provided. A thin-film channel structure to the sensor is supported on the substrate that can be accompanied by a reservoir structure, and an electrical interconnection conductor is supported on the substrate at least in part between the sensor and the substrate, and is electrically connected to the sensor. The magnetic field sensor can be provided in a bridge circuit, and can be formed by a number of interconnected individual sensors.
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