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Magnetic-Field-Sensing Materials Composed of Metal–Semiconductor Hybrid Nanostructures

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Abstract:

A huge positive magnetoresistance effect, about 4 orders of magnitude at room temperature, was discovered in metal–semiconductor hybrid nanostructures. The hybrid material consisting of metallic nanostructures that are fabricated on a GaAs substrate by ultra-high vacuum deposition method exhibits magnetic field—sensitive current-voltage characteristics. When a constant voltage above the threshold value, is applied to the film, a very steep change in the current, which we term magnetoresistive switch, is driven by the huge magnetoresistance effect under a relatively low magnetic field at room temperature. The magnetoresistance effect is very sensitive to the nanoscale morphology of the hybrid film; in other words, one can control the magnetoresistance function at will by modifying the nanostructure of this material. The origin of the magnetoresistive switch effect and its possible application as a magnetic field sensor is discussed.

Keywords: MAGNETIC FIELD SENSOR; MAGNETORESISTANCE; MAGNETORESISTIVE SWITCH; METALSEMI-CONDUCTOR HYBRID; NANOSTRUCTURE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2005.049

Publication date: February 1, 2005

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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