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 inChinese physics B Vol. 21; no. 10; pp. 403 - 409
Main 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
Format Journal Article
LanguageEnglish
Published 01.10.2012
Subjects
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
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ISSN1674-1056
2058-3834
1741-4199
DOI10.1088/1674-1056/21/10/107201

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Summary: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.
Bibliography: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）
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SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/21/10/107201