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	Room Temperature Ferromagnetism in Cobalt-Doped LiNbO3 Single Crystalline Films
	Song, Cheng ; Wang, Changzheng ; Liu, Xuejing ; Zeng, Fei ; Pan, Feng
	2010-10-12 ; 2010-10-12
关键词	VAPOR TRANSPORT EQUILIBRATION THIN-FILMS MECHANISM ZNO Chemistry, Multidisciplinary Crystallography Materials Science, Multidisciplinary
中文摘要	Cobalt-doped (5 at. %) LiNbO3 (CO:LN) single: crystalline films were prepared by combinatorial laser molecular-beam epitaxy on Al2O3 (001) substrates. The oxygen atmosphere should be severely controlled to be approximately 10 Pa to obtain stoichiometric Li/Nb concentration. Determined by asymmetric X-ray diffraction and high-resolution transmission electron microscopy, the epitaxial relationship of the sample follows (003)< 100 >(F) vertical bar. (003)< 100 >(S), (110)< 001 >(F) vertical bar vertical bar (110)< 001 >(S), and (113)<(1)over bar > 10>(F) vertical bar vertical bar (113) <(1)over bar10 >(S) (F and S denote the film and the substrate, respectively). The Co:LN films have a single-phase, where Co is not metallic but in the 2+ state. Co K-edge X-ray-absorption near-edge structure spectrum determines that Co2+ ions substitute for Nb5+ lattice sites, producing oxygen vacancies to compensate for the charge nonequilibrium, and shows that the Co-O bond length is greater than that of Co:LN films grown on Si (100) substrates. The Co:LN/Al2O3 films exhibit a high Curie temperature of similar to 550 K and room temperature ferromagnetism of 0.58 mu(B)/Co arising from the bound magnetic polarons mechanism based on defects. This work opens a window to a class of single-phase multiferroics by introducing magnetic dopants to ferroelectric materials and to the mechanism of dopants induced ferromagnetism in insulators.
语种	英语 ; 英语
出版者	AMER CHEMICAL SOC ; WASHINGTON ; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/78379]
专题	清华大学
推荐引用方式 GB/T 7714	Song, Cheng,Wang, Changzheng,Liu, Xuejing,et al. Room Temperature Ferromagnetism in Cobalt-Doped LiNbO3 Single Crystalline Films[J],2010, 2010.
APA	Song, Cheng,Wang, Changzheng,Liu, Xuejing,Zeng, Fei,&Pan, Feng.(2010).Room Temperature Ferromagnetism in Cobalt-Doped LiNbO3 Single Crystalline Films..
MLA	Song, Cheng,et al."Room Temperature Ferromagnetism in Cobalt-Doped LiNbO3 Single Crystalline Films".(2010).

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