Structural and magnetic properties of wurtzite CoO thin films

被引：21

作者：

Alaria, J. ^{[1
]}

Cheval, N. ^{[1
]}

Rode, K. ^{[1
]}

Venkatesan, M. ^{[1
]}

Coey, J. M. D. ^{[1
]}

机构：

[1] Univ Dublin Trinity Coll, Sch Phys & CRANN, Dublin 2, Ireland

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2008年 / 41卷 / 13期

关键词：

D O I：

10.1088/0022-3727/41/13/135004

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Hexagonal CoO thin films on (0 0 0 1) Al2O3 and ZnO are prepared by off-axis and on-axis pulsed laser deposition. The structural properties were studied by in situ reflection high-energy electron diffraction and ex situ x-ray diffraction. The magnetic properties of the films depend on the mode of growth. The films grown in a normal geometry are a mixture of Co3O4 and CoO and show ferromagnetism at room temperature, whereas the films grown off-axis are single phase and present a Curie-Weiss behaviour. Wurtzite CoO does not order magnetically because the antiferromagnetic Co2+-O2--Co2+ superexchange is geometrically frustrated. It is proposed that defective Co3O4 in thin films is ferrimagnetic, due to the appearance of high spin Co3+ on B sites.

引用

页数：6

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