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17 April 2007 An investigation on granular-nanocomposite-based giant magnetoresistance (GMR) sensor fabrication
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The magnetoresistance behavior of the polyurethane composites reinforced with iron nanoparticles which has been heat treated was reported. The flexible nanocomposites were fabricated by the surface-initiated-polymerization (SIP) method. The uniformly distributed nanoparticles within the polymer matrix, well characterized by field emission scanning electron microscopy, favor a continuous carbon matrix formation after annealing, rendering the transition from insulating to conductive composites. The coercive forces reflect strong particle loading and matrix dependent magnetic properties. The obtained nanocomposites possess fairly good giant magnetoresistance (MR), with a MR of 7.3 % at room temperature and 14 % at 130 K. Furthermore, the formed carbon matrix has a 7 wt.% argon adsorption potential for fuel cell applications.
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Zhanhu Guo, Suying Wei, Sung Park, Monica Moldovan, Amar Karki, David Young, and H. Thomas Hahn "An investigation on granular-nanocomposite-based giant magnetoresistance (GMR) sensor fabrication", Proc. SPIE 6526, Behavior and Mechanics of Multifunctional and Composite Materials 2007, 65260U (17 April 2007);

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