Ferromagnetism,variable range hopping,and the anomalous Hall effect in epitaxial Co：ZnO thin film
A series of high quality single crystalline epitaxial Zn 0.95 Co 0.05 O thin films is prepared by molecular beam epitaxy.Superparamagnetism and ferromagnetism are observed when the donor density is manipulated in a range of 10 18 cm 3-10 20 cm 3 by changing the oxygen partial pressure during film gr...
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| Published in | Chinese physics B Vol. 21; no. 10; pp. 403 - 409 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
01.10.2012
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1674-1056 2058-3834 1741-4199 |
| DOI | 10.1088/1674-1056/21/10/107201 |
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| Abstract | A series of high quality single crystalline epitaxial Zn 0.95 Co 0.05 O thin films is prepared by molecular beam epitaxy.Superparamagnetism and ferromagnetism are observed when the donor density is manipulated in a range of 10 18 cm 3-10 20 cm 3 by changing the oxygen partial pressure during film growth.The conduction shows variable range hopping at low temperature and thermal activation conduction at high temperature.The ferromagnetism can be maintained up to room temperature.However,the anomalous Hall effect is observed only at low temperature and disappears above 160 K.This phenomenon can be attributed to the local ferromagnetism and the decreased optimal hopping distance at high temperatures. |
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| AbstractList | A series of high quality single crystalline epitaxial Zn sub(0.95)Co sub(0.05)O thin films is prepared by molecular beam epitaxy. Superparamagnetism and ferromagnetism are observed when the donor density is manipulated in a range of 10 super(18) cm super(-3)-10 super(20) cm super(-3) by changing the oxygen partial pressure during film growth. The conduction shows variable range hopping at low temperature and thermal activation conduction at high temperature. The ferromagnetism can be maintained up to room temperature. However, the anomalous Hall effect is observed only at low temperature and disappears above 160 K. This phenomenon can be attributed to the local ferromagnetism and the decreased optimal hopping distance at high temperatures. A series of high quality single crystalline epitaxial Zn 0.95 Co 0.05 O thin films is prepared by molecular beam epitaxy.Superparamagnetism and ferromagnetism are observed when the donor density is manipulated in a range of 10 18 cm 3-10 20 cm 3 by changing the oxygen partial pressure during film growth.The conduction shows variable range hopping at low temperature and thermal activation conduction at high temperature.The ferromagnetism can be maintained up to room temperature.However,the anomalous Hall effect is observed only at low temperature and disappears above 160 K.This phenomenon can be attributed to the local ferromagnetism and the decreased optimal hopping distance at high temperatures. |
| Author | 白洪亮 贺树敏 徐同帅 刘国磊 颜世申 朱大鹏 代正坤 杨丰帆 代由勇 陈延学 梅良模 |
| AuthorAffiliation | School of Physics and National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China |
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| Cites_doi | 10.1063/1.1714508 10.1016/0022-3697(64)90156-8 10.1063/1.3431294 10.1016/j.scriptamat.2011.01.018 10.7498/aps.60.087301 10.1103/PhysRevB.79.115209 10.1103/PhysRevLett.100.047206 10.1063/1.1783591 10.1063/1.2186079 10.1103/PhysRevLett.95.225502 10.1063/1.3284075 10.1103/PhysRevB.83.045206 10.7498/aps.60.067505 10.1103/PhysRevB.81.054420 10.1063/1.3456085 10.1103/PhysRevB.77.245210 10.1103/PhysRevB.73.205342 10.1088/0022-3727/42/8/085001 10.1016/j.spmi.2007.04.053 10.1063/1.1508168 10.1038/nmat1310 10.1063/1.3357376 10.1007/BF02692541 10.1016/j.jmmm.2009.05.030 10.1103/PhysRevB.75.205206 10.1088/0022-3719/12/10/018 |
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| DocumentTitleAlternate | Ferromagnetism,variable range hopping,and the anomalous Hall effect in epitaxial Co：ZnO thin film |
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| Notes | A series of high quality single crystalline epitaxial Zn 0.95 Co 0.05 O thin films is prepared by molecular beam epitaxy.Superparamagnetism and ferromagnetism are observed when the donor density is manipulated in a range of 10 18 cm 3-10 20 cm 3 by changing the oxygen partial pressure during film growth.The conduction shows variable range hopping at low temperature and thermal activation conduction at high temperature.The ferromagnetism can be maintained up to room temperature.However,the anomalous Hall effect is observed only at low temperature and disappears above 160 K.This phenomenon can be attributed to the local ferromagnetism and the decreased optimal hopping distance at high temperatures. ZnCoO; variable range hopping; anomalous Hall effect 11-5639/O4 Bai Hong-Liang,He Shu-Min,Xu Tong-Shuai,Liu Guo-Lei,Yan Shi-Shen,Zhu Da-Peng,Dai Zheng-Kun,Yang Feng-Fan,Dai You-Yong,Chen Yan-Xue, Mei Liang-Mo （School of Physics and National Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,China） ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
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| References | 22 23 Efros A L (24) 1979; 12 27 28 29 Li S S (9) 2011; 266 Fu W Y (2) 2011; 60 Lajn A (18) 2010 30 31 Ye S (8) 2010; 200 10 11 Qiu D Q (3) 2011; 60 12 13 Ye L (26) 2007 14 15 Xu Q Y (5) 2009; 42 16 17 19 1 4 Brodsky M H (25) 1979; 36 6 7 20 21 |
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| Snippet | A series of high quality single crystalline epitaxial Zn 0.95 Co 0.05 O thin films is prepared by molecular beam epitaxy.Superparamagnetism and ferromagnetism... A series of high quality single crystalline epitaxial Zn sub(0.95)Co sub(0.05)O thin films is prepared by molecular beam epitaxy. Superparamagnetism and... |
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| SubjectTerms | Conduction heating Density Epitaxy Ferromagnetism Film growth Hall effect Optimization Thin films ZnO薄膜 分子束外延 反常霍尔效应 变程跳跃 合作 生长过程 超顺磁性 铁磁性 |
| Title | Ferromagnetism,variable range hopping,and the anomalous Hall effect in epitaxial Co：ZnO thin film |
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