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	Transition from diluted magnetic insulator to semiconductor in Co-doped ZnO transparent oxide
	Song, C. ; Liu, X. J. ; Geng, K. W. ; Zeng, F. ; Pan, F. ; He, B. ; Wei, S. Q.
	2010-05-10 ; 2010-05-10
关键词	FERROMAGNETISM SPECTROSCOPY FILMS Physics, Applied
中文摘要	Epitaxial growth of Co-doped ZnO films has been prepared on Al2O3 (001) substrate by an efficient and low cost method, i.e., direct current reactive magnetron cosputtering. The correlation among local Co structure and magnetic, electric, and optical properties of Co:ZnO films has been carefully studied. Taking advantage of decreasing the oxygen partial pressure, we have demonstrated the transition from diluted magnetic insulators (DMIs) to semiconductors (DMSs) in Zn0.96Co0.04O films. Full multiple-scattering ab initio calculations of Co K-edge x-ray-absorption near-edge structure clearly provide a structure fingerprint to determine Co2+ replacing Zn2+ and a slight dissimilarity of local Co structure between DMIs and DMSs. Co:ZnO insulating films exhibiting more robust room temperature ferromagnetism than semiconducting films reveal that structure defects are seen to be responsible for the ferromagnetic ordering in Co:ZnO transparent oxide. Furthermore, optical transmittance measurements show a large redshift instead of Burstein-Moss effect (blueshift) from DMIs to DMSs. The present result reveals the good potential for its applications in magnetic transparent electrodes, such as magnetic metal-insulator-semiconductor diodes. (c) 2007 American Institute of Physics.
语种	英语 ; 英语
出版者	AMER INST PHYSICS ; MELVILLE ; CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/20596]
专题	清华大学
推荐引用方式 GB/T 7714	Song, C.,Liu, X. J.,Geng, K. W.,et al. Transition from diluted magnetic insulator to semiconductor in Co-doped ZnO transparent oxide[J],2010, 2010.
APA	Song, C..,Liu, X. J..,Geng, K. W..,Zeng, F..,Pan, F..,...&Wei, S. Q..(2010).Transition from diluted magnetic insulator to semiconductor in Co-doped ZnO transparent oxide..
MLA	Song, C.,et al."Transition from diluted magnetic insulator to semiconductor in Co-doped ZnO transparent oxide".(2010).

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