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

Z. W. Zhao; B. K. Tay; J. S. Chen; J. F. Hu; B. C. Lim; G. P. Li

doi:10.1063/1.2721140

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

Z. W. Zhao^*, B. K. Tay, J. S. Chen, J. F. Hu, B. C. Lim, G. P. Li

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

57 Citations (Scopus)

Abstract

Co-doped ZnO nanocluster-assembled films were deposited by nanocluster-beam deposition. Zn_0.986Co_0.014O nanodusters 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 photoluminescence 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 1.4μ_B/Co and increased to 3.65μ_B/Co after the film was annealed. The possible mechanisms on the observed ferromagnetism and enhanced magnetic moment were discussed.

Original language	English
Article number	152502
Journal	Applied Physics Letters
Volume	90
Issue number	15
DOIs	https://doi.org/10.1063/1.2721140
Publication status	Published - 2007
Externally published	Yes

ASJC Scopus Subject Areas

Physics and Astronomy (miscellaneous)

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

abstract = "Co-doped ZnO nanocluster-assembled films were deposited by nanocluster-beam deposition. Zn0.986Co0.014O nanodusters 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 photoluminescence 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 1.4μB/Co and increased to 3.65μB/Co after the film was annealed. The possible mechanisms on the observed ferromagnetism and enhanced magnetic moment were discussed.",

author = "Zhao, {Z. W.} and Tay, {B. K.} and Chen, {J. S.} and Hu, {J. F.} and Lim, {B. C.} and Li, {G. P.}",

year = "2007",

doi = "10.1063/1.2721140",

language = "English",

volume = "90",

journal = "Applied Physics Letters",

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T1 - Large magnetic moment observed in Co-doped ZnO nanocluster-assembled thin films at room temperature

AU - Zhao, Z. W.

AU - Tay, B. K.

AU - Chen, J. S.

AU - Hu, J. F.

AU - Lim, B. C.

AU - Li, G. P.

PY - 2007

Y1 - 2007

N2 - Co-doped ZnO nanocluster-assembled films were deposited by nanocluster-beam deposition. Zn0.986Co0.014O nanodusters 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 photoluminescence 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 1.4μB/Co and increased to 3.65μB/Co after the film was annealed. The possible mechanisms on the observed ferromagnetism and enhanced magnetic moment were discussed.

AB - Co-doped ZnO nanocluster-assembled films were deposited by nanocluster-beam deposition. Zn0.986Co0.014O nanodusters 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 photoluminescence 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 1.4μB/Co and increased to 3.65μB/Co after the film was annealed. The possible mechanisms on the observed ferromagnetism and enhanced magnetic moment were discussed.

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

Abstract

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