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利用金属有机源化学气相沉积技术, 通过改变受主掺杂源和导入氢气并提高生长压力来逐步抑制C的办法, 在蓝宝石上外延了Mn, N共掺ZnO薄膜. X射线衍射显示所有样品都具有良好的单轴取向. ZnMnO:N样品的Raman光谱中C元素相关的振动模明显消失. 同时van der Pauw法Hall效应测量表明, 通过逐步对C的抑制, 样品由n型导电转变成p型导电, 这主要是由于C与N形成复合体取代O位(CN)O, 具有最低形成能且充当浅施主. 对N, Mn共掺ZnO晶体的第一性原理模拟计算显示了N, Mn共掺ZnO的态密度在Fermi能级处存在较强的自旋极化, 表明N 2p电子与Mn 3d电子之间存在较强的p-d相互作用, 形成磁性束缚激子产生磁矩. 一旦引入C后, C, N形成复合体取代O位, 导致体系磁性减弱或者消失. 模拟计算结果与实验表征分析结果一致表明: 对于Mn, N共掺ZnO薄膜样品, 引入C与N形成复合体取代O位, Mn, N共掺ZnO薄膜磁性减弱或消失. 因此, Mn 3d电子与N 2p局域束缚的电子形成的磁性束缚激子决定了Mn, N共掺ZnO薄膜室温铁磁信号的产生.Mn-N co-doped ZnO film on sapphire substrate is fabricated by metal-organic chemical vapor deposition method with changing the acceptor-doped source and importing the hydrogen and increasing the pressure to suppress carbon (C) approach gradually. X-ray diffraction displays the strong C-axis orientation. Raman sepectrum is employed to analyze vibration modes related to C elements. Hall measurements on the samples by van der Pauw method reveal the transition from n-type to p-type after suppression of C, which is possible due to the complex of (CN)O acting as a shallow donor. The first principles simulation calculation for Mn and N codoped ZnO crystals has been perfermed, and the total density of states reveals the strong p-d interaction and magnetic moment existing in the Mn and N codoped ZnO. The introduction of the complex of (CN)O, causes the p-d interaction to disappear and the magnetic moment to reduce even disappear. Therefore, the formation of magnetic bound polaron of Mn 3d electronics and N 2p local bound electronic determines the magnetic interaction effect, which can be explained from the theoretical predication on the Mn 3d and N 2p ferromagnetic (hole) coupling on the ferromagnetism.
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Keywords:
- dilute magnetic semiconductor /
- ferromagnetism /
- first principle /
- N-Mn codoped ZnO
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[21] Wang Q, Sun Q, Jena P, Kawazoe Y 2004 Phys. Rev. B 70 052408
[22] Dietl T, Andrearczyk T, Lipinska A, Kiecana M, Tay M, Wu Y H2007 Phys. Rev. B 76 155312
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[1] özgür ü, Alivov Y I, Liu C, Teke A, Reshchikov M A, Do?gan S,Avrutin V, Cho S J, Morko H 2005 J. Appl. Phys. 98 041301
[2] Dietl T, Ohno H, Matsukura F 2000 Science 287 1019
[3] Bi Y J, Guo Z Y, Sun H Q, Lin Z, Dong Y C 2008 Acta Phys. Sin.57 7800 (in Chinese) [毕艳军, 郭志友, 孙慧卿, 林竹, 董玉成 2008 物理学报 57 7800]
[4] Yu Z, Li X, Long X, Cheng XW,Wang J Y, Liu Y, Cao MS,WangF C 2008 Acta Phys. Sin. 57 4539 (in Chinese) [于宙, 李祥, 龙雪, 程兴旺, 王晶云, 刘颖, 曹茂盛, 王富耻 2008 物理学报 57 4539]
[5] Sharma P, Gupta A, Rao K V 2003 Nat. Mater. 2 673
[6] Liu S M, Gu S L, Ye J D, Zhu S M, Liu W, Tang K, Shan Z P,Zhang R, Zheng Y D, Sun X W 2008 Appl. Phys. A 91 535
[7] Wu K P, Gu S L, Tang K, Zhu S M, Xu M X, Zhang R, Zheng YD 2009 J. Appl. Phys. 106 113710
[8] Wu K P, Gu S L, Tang K, Zhu S M, Zhang R, Zheng Y D 2011Thin Solid Films 519 2499
[9] Nickel N H, Friedrich F, Rommeluère J F, Galtier P 2005 Appl.Phys. Lett. 87 211905
[10] Tang K, Gu S L, Zhu S M, Liu J G, Chen H, Ye J D, Zhang RZheng Y D 2009 Appl. Phys. Lett. 95 192106
[11] Chen H, Gu S L, Liu W, Zhu S M, Zheng Y D 2008 J. Appl. Phys.104 113511
[12] Segall M D, Lindan P J D, Probert M J 2002 J. Phys. Cond. Matt.14 2717
[13] Marlo M 2000 Phys. Rev. B 62 2899
[14] Yuan D, Huang D H, Luo H F,Wang F H 2010 Acta Phys. Sin. 596457 (in Chinese) [袁娣, 黄多辉, 罗华锋, 王藩侯 2010 物理学报 59 6457]
[15] Duan M Y, Xu M, Zhou H P, Chen Q Y, Hu Z G, Dong C J 2007Acta Phys. Sin. 56 5359 (in Chinese) [段满益, 徐明, 周海平, 陈青云, 胡志刚, 董成军 2007 物理学报 56 5359]
[16] Ye J D, Gu S L, Zhu S M, Zhang R, Zheng Y D 2006 Appl. Phys.Lett. 88 101905
[17] Tang K, Gu S L, Zhu S M, Liu W, Ye J D, Zhu J M, Zhang R,Zheng Y D, Sun X W 2008 Appl. Phys. Lett. 93 132107
[18] Li X, Keyes B, Asher S, Zhang S B, Wei S H, Coutts T J, LimpijumnongS, van de Walle C G 2005 Appl. Phys. Lett. 86 122107
[19] Li X, Asher S E, Limpijumnong S, Zhang S B,Wei S H, Barnes TM, Coutts T J, Noufi R 2006 J. Vac. Sci. Technol. A 24 1213
[20] Zhang S B, Northrup J E 1991 Phys. Rev. Lett. 67 2339
[21] Wang Q, Sun Q, Jena P, Kawazoe Y 2004 Phys. Rev. B 70 052408
[22] Dietl T, Andrearczyk T, Lipinska A, Kiecana M, Tay M, Wu Y H2007 Phys. Rev. B 76 155312
[23] Dietl T 2006 Nat. Mater. 5 673
[24] Zhang S B, Wei S H, Zunger A 2001 Phys. Rev. B 63 075205
[25] Yadav M K, Sanyal B, Mookerjee A 2009 J. Magn. Magn. Mater.321 273
[26] Liu Q H, Sun Z H, Yan W Y, Zhong W J, Pan Z Y, Hao L Y, WeiS Q 2007 Phys. Rev. B 76 245210
[27] Liu E Z, He Y, Jiang J Z 2006 Appl. Phys. Lett. 89 122504
[28] Hsu H S, Huang J C A, Huang Y H, Liao Y F, Lin M Z, Lee C H2006 Appl. Phys. Lett. 89 122504
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