Structural, magnetic and spectroscopic study of a diluted magnetic oxide:: Co doped CeO2-δ

被引：33

作者：

Vodungbo, B. ^{[1
]}

Vidal, F. ^{[1
]}

Zheng, Y. ^{[1
]}

Marangolo, M. ^{[1
]}

Demaille, D. ^{[1
]}

Etgens, V. H. ^{[1
]}

Varalda, J. ^{[2
]}

De Oliveira, A. J. A. ^{[2
]}

Maccherozzi, F. ^{[3
]}

Panaccione, G. ^{[3
]}

机构：

[1] Univ Paris 06, CNRS, UMR 7588, Inst NanoSci Paris, F-75015 Paris, France

[2] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP, Brazil

[3] CNR, INFM, TASC Lab, I-34012 Trieste, Italy

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2008年 / 20卷 / 12期

关键词：

D O I：

10.1088/0953-8984/20/12/125222

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A structural, spectroscopic and magnetic study of Co doped CeO2-delta diluted magnetic oxide (DMO) thin films grown by pulsed laser deposition is presented. No secondary phase or metallic clusters could be detected. The samples are ferromagnetic at room temperature and epitaxial films display a large magnetic anisotropy with an out-of-plane easy axis. The evolution of the magnetization with temperature did not reveal any superparamagnetic signal related to nanosized clusters, reinforcing the conclusion that the ferromagnetism is intrinsic in this system. The magnetization at saturation has the same magnitude (similar to 1.4-1.5 mu(B)/Co) in epilayers and textured films and shows no clear dependence on the structural quality, contrary to other DMOs. It is also shown that ferromagnetism is not restricted to a particular region of the films, such as the interface. The ferromagnetic signal depends sensitively on the oxygen pressure during growth and post-growth annealing. The valence of Ce and Co was deduced from x-ray spectroscopies, revealing a predominant Co2+ state. The origin of ferromagnetism in Co doped CeO2-delta is discussed in connection with possible charge-compensating defects and existing models describing indirect exchange in DMOs.

引用

页数：10

共 44 条

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