An experimental investigation is presented into the extraordinary Hall effect (EHE) in planar ensembles of Co nanoparticles embedded in a W or Au matrix. The EHE signal strength is shown to depend on the mean thicknesses of both the nanoparticles and the matrix. Its maximum is observed for mean Co thicknesses of 0.3–0.6 nm. The EHE signal is found to grow with decreasing matrix thickness until the structure loses its electrical continuity. A sensitivity as high as S = 32 Θ/T (S = ΔU/IΔH) is achieved with a Co-W film. This result opens up possibilities for building room-temperature ferromagnetic sensors for local magnetometry.
Russian Microelectronics – Springer Journals
Published: Mar 30, 2007
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