Evidence of Superparamagnetic Co Clusters in Pulsed Laser Deposition-Grown Zn0.9Co0.1O Thin Films Using Atom Probe Tomography

被引：64

作者：

Larde, Rodrigue ^{[1
,2
]}

Talbot, Etienne ^{[1
,2
]}

Pareige, Philippe ^{[1
,2
]}

Bieber, Herrade ^{[3
]}

Schmerber, Guy ^{[3
]}

Colis, Silviu ^{[3
]}

Pierron-Bohnes, Veronique ^{[3
]}

Dinia, Aziz ^{[3
]}

机构：

[1] Univ Rouen, CNRS, UMR 6634, GPM, F-76801 St Etienne, France

[2] INSA Rouen, F-76801 St Etienne, France

[3] CNRS UDS, UMR 7504, IPCMS, F-67034 Strasbourg 2, France

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2011年 / 133卷 / 05期

关键词：

DILUTED MAGNETIC SEMICONDUCTORS; TEMPERATURE FERROMAGNETISM; TRANSPORT-PROPERTIES; ROOM-TEMPERATURE; OXIDE; ORIGIN; BULK; ZN;

D O I：

10.1021/ja108290u

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Nanosized Co clusters (of about 3 nm size) were unambiguously identified in Co-doped ZnO thin films by atom probe tomography. These clusters are directly correlated to the superparamagnetic relaxation observed by ZFC/FC magnetization measurements. These analyses provide strong evidence that the room-temperature ferromagnetism observed in the magnetization curves cannot be attributed to the observed Co clusters. Because there is no experimental evidence of the presence of other secondary phases, our results reinforce the assumption of a defect-induced ferromagnetism in Co-doped ZnO diluted magnetic semiconductors.

引用

页码：1451 / 1458

页数：8

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