Synthesis and Magnetic Properties of Manganese-Doped GaP Nanowires |
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Authors: | Han Doo Suk Bae Seung Yong Seo Hee Won Kang Young Joo Park Jeunghee Lee Gangho Ahn Jae-Pyoung Kim Soonkyu Chang Joonyeon |
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Affiliation: | Department of Chemistry, Korea University, Jochiwon 339-700, Korea. |
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Abstract: | We characterized the structure and magnetic properties of Mn-incorporated GaP nanowires synthesized by thermal evaporation of GaP/Mn powders. The nanowires consist of twin-crystalline zinc blende GaP grown with the [111] direction and doped with about 1 at. % Mn. They are often sheathed with the bumpy amorphous outerlayers containing high concentrations of Mn and O. The ferromagnetic hysteresis curves at 5 and 300 K and temperature-dependent magnetization provide evidence for the ferromagnetism with the Curie temperature higher than room temperature. Magnetic properties of individual nanowires have been measured, showing a large negative magnetoresistance equal to about -5% at 5 K. We suggest that the Mn doping of GaP nanowires would form a dilute magnetic semiconductor. |
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