Room temperature ferromagnetism in Fe-doped CeO2 thin films grown on LaAlO3 (001)

被引：30

作者：

Sharma, S. K. ^{[1
]}

Thakur, P. ^{[2
]}

Kumar, Shalendra ^{[3
]}

Shukla, D. K. ^{[4
]}

Brookes, N. B. ^{[2
]}

Lee, C. G. ^{[3
]}

Pirota, K. R. ^{[1
]}

Koo, B. H. ^{[3
]}

Knobel, M. ^{[1
]}

机构：

[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil

[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[3] Changwon Natl Univ, Sch Nano & Adv Mat Engn, Chang Won 641773, South Korea

[4] Aligarh Muslim Univ, Dept Phys, Aligarh 202002, Uttar Pradesh, India

来源：

THIN SOLID FILMS | 2010年 / 519卷 / 01期

基金：

巴西圣保罗研究基金会;

关键词：

Ferromagnetism; X-ray absorption spectroscopy; X-ray magnetic circular dichroism; Magnetization; Cerium oxide; Doped oxides; Iron; Pulse laser deposition; MAGNETIC CIRCULAR-DICHROISM;

D O I：

10.1016/j.tsf.2010.08.096

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ce1-xFexO2-delta/LaAlO3(001) thin films (x = 0.01 and 0.03) have been prepared by pulsed laser deposition method and thoroughly characterized using X-ray diffraction (XRD), dc magnetization, near edge X-ray absorption fine structure (NEXAFS), and X-ray magnetic circular dichroism (XMCD). XRD data reveal a single-phase cubic structure with a strong crystallographic orientation along the (200) plane. Room temperature ferromagnetism is confirmed through isothermal hysteresis as well as temperature dependent magnetization measurements, which clearly show the ferromagnetic Curie temperature occurring at least above 350 K. The Fe L-3.2 edge NEXAFS spectra for both Fe-doped thin films exhibit mixed valent Fe2+/Fe3+ states, whereas Ce M-5.4 edge shows the 4+ state of Ce, throughout the doping. With the increase in Fe doping, Fe2+ state increases and a simultaneous decrease in magnetization value is also observed. The XMCD signal of both samples reveals the ferromagnetic ordering of substituted Fe ions in the ceria matrix. Our results indicate that ferromagnetism is intrinsic to the ceria system and is not due to any secondary magnetic impurity. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：410 / 413

页数：4

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