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Extraordinary Magnetoresistance in Semiconductor/Metal Hybrids: A Review

Computer, Electrical and Mathematical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
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Materials 2013, 6(2), 500-516; https://doi.org/10.3390/ma6020500
Received: 4 December 2012 / Revised: 28 January 2013 / Accepted: 29 January 2013 / Published: 13 February 2013
The Extraordinary Magnetoresistance (EMR) effect is a change in the resistance of a device upon the application of a magnetic field in hybrid structures, consisting of a semiconductor and a metal. The underlying principle of this phenomenon is a change of the current path in the hybrid structure upon application of a magnetic field, due to the Lorentz force. Specifically, the ratio of current, flowing through the highly conducting metal and the poorly conducting semiconductor, changes. The main factors for the device’s performance are: the device geometry, the conductivity of the metal and semiconductor, and the mobility of carriers in the semiconductor. Since the discovery of the EMR effect, much effort has been devoted to utilize its promising potential. In this review, a comprehensive overview of the research on the EMR effect and EMR devices is provided. Different geometries of EMR devices are compared with respect to MR ratio and output sensitivity, and the criteria of material selection for high-performance devices are discussed. View Full-Text
Keywords: magnetoresistance effect; extraordinary magnetoresistance effect; semiconductor/metal hybrid; magnetic sensors; high-mobility semiconductors; III–V semiconductors magnetoresistance effect; extraordinary magnetoresistance effect; semiconductor/metal hybrid; magnetic sensors; high-mobility semiconductors; III–V semiconductors
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Sun, J.; Kosel, J. Extraordinary Magnetoresistance in Semiconductor/Metal Hybrids: A Review. Materials 2013, 6, 500-516.

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