Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 329, Issue -, Pages 53-58Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2012.09.070
Keywords
Multiferroic materials; Magnetic properties; Ferrimagnetism; Valence fluctuations
Funding
- FAPESP [2007/08072-0]
- France-Brazil CAPES-COFECUB [706/11]
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The structural and magnetic properties of the cubic spinel oxide Co2MnO4 (Fd3m space group) doped with different concentrations of bismuth, were investigated by X-ray diffraction and SQUID magnetometry. The Bi3+ ions entering into the Co-III octahedral sites do not alter the effective moment, mu(eff) similar to 8.2 mu(B), whereas both the magnetization M-50 kOe at the highest field (50 kOe) and the field-cooled M-FC magnetizations increased when increasing the Bi content. The ferrimagnetic character of the parent compound, Co2MnO4, is maintained for all materials although the antiferromagnetic interactions Co2+-Co2+ are affected, resulting in higher values of the Curie-Weiss temperature. Due to the large ionic radius of Bi, octahedra distortions occur as well as valence fluctuations of the Mn ions, giving rise to Jahn-Teller effects and enhancing the exchange interactions. The off-center Bi3+ ion is responsible of non-centrosymmetric charge ordering and should lead to multiferroisme conditions for the BixCo2-xMnO4 material. (C) 2012 Elsevier B.V. All rights reserved.
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