Room-temperature ferromagnetism in pure and Co doped CeO2 powders

被引：116

作者：

Wen, Qi-Ye ^{[1
]}

Zhang, Huai-Wu

Song, Yuan-Qiang

Yang, Qing-Hui

Zhu, Hao

Xiao, John Q.

机构：

[1] Univ Elect Sci & Technol China, State Key Lab Elect Films & Integrated Devices, Chengdu 610054, Peoples R China

[2] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2007年 / 19卷 / 24期

关键词：

D O I：

10.1088/0953-8984/19/24/246205

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report the room-temperature (RT) ferromagnetism (FM) observed in pure and Co doped CeO(2) powder. An insulating nonmagnetic CeO(2) single crystal, after grinding into fine powder, shows an RT-FM with a small magnetization of 0.0045 emu g(-1). However, the CeO(2) powder became paramagnetic after oxygen annealing, which strongly suggests an oxygen vacancy meditated FM ordering. Furthermore, by doping Co into CeO(2) powder the FM can significantly enhance through a F-centre exchange (FCE) coupling mechanism, in which both oxygen vacancies and magnetic ions are involved. As the Co content increases, the FM of Co doped CeO(2) initially increases to a maximum 0.47 emu g(-1), and then degrades very quickly. The complex correlation between the Co content and saturation magnetization was well interpreted by supposing the coexistence of three subsets of Co ions in CeO(2). Our results reveal that the large RT-FM observed in Co doped CeO(2) powder originates from a combination effect of oxygen vacancies and transition metal doping.

引用

页数：7

共 23 条

[1] Ferromagnetism in Fe-doped SnO2 thin films [J].

Coey, JMD ;

Douvalis, AP ;

Fitzgerald, CB ;

Venkatesan, M .

APPLIED PHYSICS LETTERS, 2004, 84 (08) :1332-1334

[2] CATALYTIC PROPERTIES AND SURFACE-STATES OF COBALT-CONTAINING OXIDATION CATALYSTS [J].

GARBOWSKI, E ;

GUENIN, M ;

MARION, MC ;

PRIMET, M .

APPLIED CATALYSIS, 1990, 64 (1-2) :209-224

[3] Room-temperature ferromagnetism observed in undoped semiconducting and insulating oxide thin films [J].

Hong, NH ;

Sakai, J ;

Poirot, N ;

Brizé, V .

PHYSICAL REVIEW B, 2006, 73 (13)

[4] Role of defects in tuning ferromagnetism in diluted magnetic oxide thin films [J].

Hong, NH ;

Sakai, J ;

Huong, NT ;

Poirot, N ;

Ruyter, A .

PHYSICAL REVIEW B, 2005, 72 (04)

[5] Transparent Cr-doped SnO2 thin films:: ferromagnetism beyond room temperature with a giant magnetic moment [J].

Hong, NH ;

Sakai, J ;

Prellier, W ;

Hassini, A .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2005, 17 (10) :1697-1702

[6] Ferromagnetism in transition-metal-doped TiO2 thin films -: art. no. 195204 [J].

Hong, NH ;

Sakai, J ;

Prellier, W ;

Hassini, A ;

Ruyter, A ;

Gervais, F .

PHYSICAL REVIEW B, 2004, 70 (19) :1-6

[7] Evidence of oxygen vacancy enhanced room-temperature ferromagnetism in Co-doped ZnO [J].

Hsu, H. S. ;

Huang, J. C. A. ;

Huang, Y. H. ;

Liao, Y. F. ;

Lin, M. Z. ;

Lee, C. H. ;

Lee, J. F. ;

Chen, S. F. ;

Lai, L. Y. ;

Liu, C. P. .

APPLIED PHYSICS LETTERS, 2006, 88 (24)

[8] Low temperature epitaxial growth of CeO2(110) layers on Si(100) using electron beam assisted evaporation [J].

Inoue, T ;

Yamamoto, Y ;

Satoh, M .

THIN SOLID FILMS, 1999, 343 :594-597

[9] Chemical manipulation of High-TC ferromagnetism in ZnO diluted magnetic semiconductors -: art. no. 147209 [J].

Kittilstved, KR ;

Norberg, NS ;

Gamelin, DR .

PHYSICAL REVIEW LETTERS, 2005, 94 (14)

[10] Absence of room temperature ferromagnetism in bulk Mn-doped ZnO [J].

Kolesnik, S ;

Dabrowski, B .

JOURNAL OF APPLIED PHYSICS, 2004, 96 (09) :5379-5381

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