| Original Articles |
|
|
|
|
Origin of Room-Temperature Ferromagnetism for Cobalt-Doped ZnO Diluted Magnetic Semiconductor |
| PENG Long1;ZHANG Huai-Wu1;WEN Qi-Ye1;SONG Yuan-Qiang1;SU Hua1;John Q. Xiao2 |
| 1State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 6100542Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA |
|
| Cite this article: |
|
PENG Long, ZHANG Huai-Wu, WEN Qi-Ye et al 2008 Chin. Phys. Lett. 25 1438-1441 |
|
|
|
Abstract The pure single phase of Zn0.95Co0.05O bulks is successfully prepared by solid-state reaction method. The effects of annealing atmosphere on room-temperature ferromagnetic behaviour for the Zn0.95Co0.05O bulks are
investigated. The results show that the air-annealed samples has similar weak ferromagnetic behaviour with the as-sintered samples, but the obvious ferromagnetic behaviour is observed for the samples annealed in vacuum or Ar/H2 gas, indicating that the strong ferromagnetism is associated with high oxygen vacancies density. High saturation magnetization Ms=0.73μB/Co and coercivity Hc=233.8Oe are obtained for the Ar/H2 annealed samples with pure single phase structure. The enhanced room-temperature ferromagnetic behaviour is also found in the samples with high carrier concentration controlled by doping interstitials Zn (Zni).
|
| Keywords:
75.50.Pp
81.20.Ev
76.30.Fc
|
|
|
Received: 12 September 2007
Published: 31 March 2008
|
|
| PACS: |
75.50.Pp
|
(Magnetic semiconductors)
|
| |
81.20.Ev
|
(Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)
|
| |
76.30.Fc
|
(Iron group (3d) ions and impurities (Ti-Cu))
|
|
|
|
|
|
[1] Hong N H, Sakai J, Prellier W, Hassini A, Ruyter A and Gervais F2004 Phys. Rev. B 70 195204
[2] Coey J M D, Douvalis A P, Fitzgerald C B and Venkatesan M 2004 Appl. Phys. Lett. 84 1332
[3] Hong N H, Sakai J, Hassini A and Ruyter A 2005 J. Phys.:Condens. Mater. 17 1697
[4] Weng H M, Yang X P, Dong J M, Mizuseki H, Kawasaki M and Kawazoe Y2004 Phys. Rev. B 69 125219
[5] Jaffe J E, Droubay T C and Chambers S A 2005 J. Appl.Phys. 97 073908.
[6] Schwartz D A and Gamelin 2004 Adv. Mater. 16 2115
[7] Hong N H, Sakai J, Poirot N and Brize V 2006 Phys. Rev.B 73 132404
[8] Coey J M D, Venkatesan M and Fitzgerald C B 2005 Nat.Mater. 4 173
[9] Venkatesan M, Fitzgerald C B, Lunney J G and Coey J M D 2004 Phys. Rev. Lett. 93 177206 |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
