Chin. Phys. Lett.  2007, Vol. 24 Issue (1): 214-217    DOI:
Original Articles |
Variations from Zn1-xCoxO Magnetic Semiconductor to Co--ZnCoO Granular Composite
CHEN Yan-Xue1;YAN Shi-Shen1;LIU Guo-Lei1;MEI Liang-Mo1;REN Miao-Juan2
1School of Physics and Microelectronics and National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100 2School of Science, Jinan University, Jinan 250022
Cite this article:   
CHEN Yan-Xue, YAN Shi-Shen, LIU Guo-Lei et al  2007 Chin. Phys. Lett. 24 214-217
Download: PDF(258KB)  
Export: BibTeX | EndNote | Reference Manager | ProCite | RefWorks
Abstract We investigate the variations from as-deposited Zn1-xCoxO magnetic semiconductors to the post-annealed Co--ZnCoO granular composite. The as-deposited Zn1-xCoxO magnetic semiconductor deposited under thermal non-equilibrium conditions is composed of Zn1-xCoxO nanograins of high Co concentration. The room-temperature ferromagnetism with high magnetization and large negative magnetoresistance are found in the as-deposited samples. By annealing, the samples become of granular composite consisting of the Co metal grains and the remanent Zn1-xCoxO matrix. Although the magnetization is enhanced after annealing, the spin-dependent negative magnetoresistance disappears at room temperature. The magnetoresistance observed in the annealed samples in the high field region has no relation with the ferromagnetism, which in turn indicates that the room-temperature ferromagnetism and large negative magnetoresistance observed in the as-deposited are the intrinsic properties of the Zn1-xCoxO magnetic semiconductor.
Keywords: 75.50.Pp      75.47.-m     
Published: 01 January 2007
PACS:  75.50.Pp (Magnetic semiconductors)  
  75.47.-m (Magnetotransport phenomena; materials for magnetotransport)  
TRENDMD:   
URL:  
https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2007/V24/I1/0214
Service
E-mail this article
E-mail Alert
RSS
Articles by authors
CHEN Yan-Xue
YAN Shi-Shen
LIU Guo-Lei
MEI Liang-Mo
REN Miao-Juan
Related articles from Frontiers Journals
[1] YUAN Xiao-Bo, REN Jun-Feng, HU Gui-Chao. Effect of Carrier Differences on Magnetoresistance in Organic and Inorganic Spin Valves[J]. Chin. Phys. Lett., 2012, 29(6): 214-217
[2] JI Chang-Jian**, ZHANG Cheng-Qiang, ZHAO Gang, WANG Wen-Jing, SUN Gang, YUAN Hui-Min, HAN Qi-Feng . Preparation and Properties of Diluted Magnetic Semiconductors GaMnAs by Low-Temperature Molecular Epitaxy[J]. Chin. Phys. Lett., 2011, 28(9): 214-217
[3] PENG Lin**, LIU Yong-Sheng, CAI Chuan-Bing, ZHANG Jin-Cang . Influence of Magnetic Scattering and Interface Transparency on Superconductivity Based on a Ferromagnet/Superconductor Heterostructure[J]. Chin. Phys. Lett., 2011, 28(8): 214-217
[4] P. Nalini, A. John Peter** . Energy Gap Dependence on Mn Content in a Diluted Magnetic Quantum Dot[J]. Chin. Phys. Lett., 2011, 28(4): 214-217
[5] Murtaza Saleem**, Saadat A. Siddiqi, Shahid Atiq, M. Sabieh Anwar . Structural and Magnetic Studies of Zn0.95Co0.05O and Zn0.90Co0.05Al0.05O[J]. Chin. Phys. Lett., 2011, 28(11): 214-217
[6] QIN Yu-Feng, YAN Shi-Shen, KANG Shi-Shou, XIAO Shu-Qin, LI Qiang, DAI Zheng-Kun, SHEN Ting-Ting, DAI You-Yong**, LIU Guo-Lei, CHEN Yan-Xue, MEI Liang-Mo, ZHANG Ze . Electric and Magnetic Field Tunable Rectification and Magnetoresistance in FexGe1−x/Ge Heterojunction Diodes[J]. Chin. Phys. Lett., 2011, 28(10): 214-217
[7] LI Tian-Jing, LI Gong-Ping, GAO Xing-Xin, CHEN Jing-Sheng. Observation of Room Ferromagnetism in Cu-Implanted Crystal ZnO[J]. Chin. Phys. Lett., 2010, 27(8): 214-217
[8] ZHANG Yan, SHENG Peng, LIU Wen-Ming, SHU Qi, GU Zhi-Hua, NI Gang,. Influence of Substrate on the Transportation Properties of Co/Alq3 Granular Films on a Si Wafer[J]. Chin. Phys. Lett., 2010, 27(7): 214-217
[9] YAN Huai-Yue, XIU Xiang-Qian, HUA Xue-Mei, LIU Zhan-Hui, ZHOU An, ZHANG Rong, XIE Zi-Li, HAN Ping, SHI Yi, ZHENG You-Dou . Optical and Structural Properties of Cr-Doped GaN Grown by HVPE Method[J]. Chin. Phys. Lett., 2010, 27(12): 214-217
[10] XU Jian-Ping, LI Lan, LV Li-Ya, ZHANG Xiao-Song, CHEN Xi-Ming, WANG Jian-Feng, ZHANG Feng-Ming, ZHONG Wei, DU You-Wei. Structural and Magnetic Properties of Fe-Doped Anatase TiO2 Films Annealed in Vacuum[J]. Chin. Phys. Lett., 2009, 26(9): 214-217
[11] WU Li-Hua, ZHANG Xiao-Zhong, ZHANG Xin, WAN Cai-Hua, GAO Xi-Li, TAN Xin-Yu, YUAN Jun. Bias Voltage Controlled Positive Magnetoresistance of Fe0.05-C0.95/Si Heterostructures[J]. Chin. Phys. Lett., 2009, 26(8): 214-217
[12] JIANG Li-Juan, WANG Xiao-Liang, XIAO Hong-Ling, WANG Zhan-Guo, FENG Chun, ZHANG Ming-Lan, TANG Jian. Structural and Magnetic Properties of Sm Implanted GaN[J]. Chin. Phys. Lett., 2009, 26(7): 214-217
[13] DENG Jiang-Xia, YAN Shi-Shen, MEI Liang-Mo, J. P. Liu, B. Altuncevahir, V. Chakka, WANG Yong, ZHANG Ze, SUN Xiang-Cheng, J. Lian, K. Sun. Magnetic Properties and Antiferromagnetic Coupling in Inhomogeneous Zn1-xFexO Magnetic Semiconductor[J]. Chin. Phys. Lett., 2009, 26(2): 214-217
[14] XING Peng-Fei, CHEN Yan-Xue, TANG Min-Jian, YAN Shi-Shen, LIU Guo-Lei, MEI Liang-Mo, JIAO Jun,. Room-Temperature Anisotropic Ferromagnetism in Fe-Doped In2O3 Heteroepitaxial Films[J]. Chin. Phys. Lett., 2009, 26(11): 214-217
[15] LIU Zhao-Sen, Divis Martin, Sechovsky Vladimir. Negative Magnetoresistivity of ErBi and Its Crystal-Field Levels[J]. Chin. Phys. Lett., 2009, 26(1): 214-217
Viewed
Full text


Abstract