Valence state dependent room-temperature ferromagnetism in Fe-doped ceria nanocrystals

被引：38

作者：

Dohcevic-Mitrovic, Z. D. ^{[1
]}

Paunovic, N. ^{[1
]}

Radovic, M. ^{[1
]}

Popovic, Z. V. ^{[1
]}

Matovic, B. ^{[2
]}

Cekic, B. ^{[2
]}

Ivanovski, V. ^{[2
]}

机构：

[1] Inst Phys, Ctr Solid State Phys & New Mat, Belgrade 11080, Serbia

[2] Inst Nucl Sci Vinca, Belgrade 11001, Serbia

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 20期

关键词：

annealing; cerium compounds; ferromagnetic materials; iron; magnetic particles; nanoparticles; Raman spectra; vacancies (crystal); valence bands; THIN-FILMS;

D O I：

10.1063/1.3431581

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Room-temperature ferromagnetism was observed in undoped and Fe(2+(3+))-doped CeO(2) nanocrystals. In Fe-doped samples the enhancement of ferromagnetic ordering occurs by changing the valence state of Fe ions, whereas Raman spectra demonstrated strong electron-molecular vibrational coupling and increase in oxygen vacancy concentration. Air annealing showed degradation of ferromagnetic ordering and appearance of hematite phase in Fe(3+)-doped sample. The observed ferromagnetic coupling in Fe-doped samples, associated with the presence of magnetic ions mediated by single charged O(2-) vacancies, demonstrated that valence state of dopant has a strong influence on magnetic properties of CeO(2) nanoparticles. (C) American Institute of Physics. [doi: 10.1063/1.3431581]

引用

页数：3

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