Large magnetic moment observed in Co-doped ZnO nanocluster-assembled thin films at room temperature

被引：53

作者：

Zhao, Z. W. ^{[1
]}

Tay, B. K.

Chen, J. S.

Hu, J. F.

Lim, B. C.

Li, G. P.

机构：

[1] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 637798, Singapore

[2] Data Storage Inst, Singapore 117608, Singapore

[3] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 119260, Singapore

[4] Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2007年 / 90卷 / 15期

关键词：

D O I：

10.1063/1.2721140

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Co-doped ZnO nanocluster-assembled films were deposited by nanocluster-beam deposition. Zn0.986Co0.014O nanoclusters remained wurtzite in structure with size of 5 nm. Compared with bulk ZnO, a blueshift of 0.28 eV was observed in the absorption edge of the film. Two photo-luminescence bands at 378 and 510 nm were detected. Room-temperature ferromagnetism was observed in doped ZnO nanocluster-assembled film. Moreover, it exhibited a large saturated magnetization of 1.4 mu(B)/Co and increased to 3.65 mu(B)/Co after the film was annealed. The possible mechanisms on the observed ferromagnetism and enhanced magnetic moment were discussed. (c) 2007 American Institute of Physics.

引用

页数：3

共 24 条

[1] Ferromagnetism at room temperature on electrodeposited Co2+-doped ZnO thin film [J].

Abid, M. ;

Abid, J. -P. ;

Ansermet, J. -Ph. .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2006, 153 (08) :D138-D142

[2]

[Anonymous], 1995, HDB XRAY PHOTOELECTR

[3] Room-temperature ferromagnetic Co-doped ZnO nanoneedle array prepared by pulsed laser deposition [J].

Chen, JJ ;

Yu, MH ;

Zhou, WL ;

Sun, K ;

Wang, LM .

APPLIED PHYSICS LETTERS, 2005, 87 (17) :1-3

[4] Donor impurity band exchange in dilute ferromagnetic oxides [J].

Coey, JMD ;

Venkatesan, M ;

Fitzgerald, CB .

NATURE MATERIALS, 2005, 4 (02) :173-179

[5] Ferromagnetism in Fe-doped SnO2 thin films [J].

Coey, JMD ;

Douvalis, AP ;

Fitzgerald, CB ;

Venkatesan, M .

APPLIED PHYSICS LETTERS, 2004, 84 (08) :1332-1334

[6] Synthesis and magnetic properties of Co-doped ZnO nanowires [J].

Cui, Jingbiao ;

Zeng, Qi ;

Gibson, Ursula J. .

JOURNAL OF APPLIED PHYSICS, 2006, 99 (08)

[7] Zener model description of ferromagnetism in zinc-blende magnetic semiconductors [J].

Dietl, T ;

Ohno, H ;

Matsukura, F ;

Cibert, J ;

Ferrand, D .

SCIENCE, 2000, 287 (5455) :1019-1022

[8] Origin of ultraviolet photoluminescence in ZnO quantum dots: Confined excitons versus surface-bound impurity exciton complexes [J].

Fonoberov, VA ;

Balandin, AA .

APPLIED PHYSICS LETTERS, 2004, 85 (24) :5971-5973

[9]

FURDYNA JK, 1988, J APPL PHYS, V64, P29

[10]

GARSON GA, 1996, J VAC SCI TECHNOL A, V14, P1637

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