Room temperature diluted magnetic semiconductor synthesized by dual beam laser deposition |
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Authors: | YZ Peng WD Song CW An JJ Qiu JF Chong BC Lim MH Hong T Liew TC Chong |
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Institution: | (1) Data Storage Institute, DSI Building, 5 Engineering Drive 1, Singapore, 117608, Singapore;(2) Electrical and Computer Engineering Department, National University of Singapore, Singapore, 119260, Singapore |
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Abstract: | Diluted magnetic semiconductor Co-doped ZnO film has been synthesized by a dual beam pulsed laser deposition method. The magnetic, electrical, and optical properties of the Zn0.985Co0.015O0.67 film are studied in this paper. The film shows ferromagnetic behavior with a coercivity of about 300 Oe at room temperature, and semiconductor behavior with carrier concentration of 2.2×1018 cm-3, and a resistivity of 102 m![OHgr](/content/83vaa46632kbaltg/xxlarge937.gif) cm. Structural investigations indicated that the film has similar lattice constants to that of ZnO. It is shown that the film exhibits excellent optical properties with a band gap energy of 3.31 eV, which is close to that of ZnO. The origins of the magnetism are also discussed. PACS 81.15.Fg; 75.50 Pp; 61.72.Vv |
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