Magnetism and Giant Magneto-Transport Properties in Granular Solids
نویسنده
چکیده
Magnetic granular solids consist of nanometer-sized magnetic particles uniformly dispersed and embedded in an immiscible insulating or metallic medium. They display a rich variety of magnetic properties and giant magneto-transport properties due to their unique nanostructure, which can be usefully described by the metal volume fraction and the metal particle diameter of granular solids. Fabrications and characterizations of granular solids, their enhanced magnetic properties, percolation behavior, single-domain characteristics, superparamagnetic relaxation, and superparamagnetism are reviewed. Giant magneto-transport properties, recently observed in granular solids, including giant magnetoresistance, extraordinary Hall resistivity, magneto-thermal conductivity, and Wiedemann-Franz law are discussed.
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