Bi-substitution-induced magnetic moment distr...

Bi-substitution-induced magnetic moment distribution in spinel BixCo2−xMnO4 multiferroic
Author
N E Rajeevan 1, Ravi Kumar 2,7, D K Shukla 3, P Thakur 4, N B Brookes 4, K H Chae 5, W K Choi 5, S Gautam 5, S K Arora 6, I V Shvets 6 and P P Pradyumnan 1
Affiliations
1 Department of Physics, University of Calicut, Kerala 673635, India
2 Materials Science Division, Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India
3 Department of Physics, Aligarh Muslim University, Aligarh 202002, India
4 European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France
5 Materials Science and Technology Research Division, KIST, Seoul 136791, Korea
6 CRANN, School of Physics, Trinity College Dublin, Dublin 2, Republic of Ireland
7 Author to whom any correspondence should be addressed
E-mail
ranade@iuac.ernet.in
Journal
Journal of Physics: Condensed MatterCreate an alertRSS this journal
Issue
Volume 21, Number 40
Citation
N E Rajeevan et al 2009 J. Phys.: Condens. Matter 21 406006
doi:10.1088/0953-8984/21/40/406006
ArticleReferences
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Abstract
We report the near-edge x-ray absorption spectroscopy (NEXAFS) at the Co/Mn L3,2 edge and oxygen K edge of the well-characterized Bi-substituted Co2MnO4 multiferroic samples. The evolution of peak features in NEXAFS spectra of the Co/Mn L3,2 edge and O K edge show the Bi-induced redistribution of magnetic cations (Co/Mn). The variation in valence states of Co and Mn in all the substituted compositions is consistent with the observed ferrimagnetic behaviour of the samples. Magnetization data show the decrease in molecular field complementing the ferrimagnetism. The role of Bi in the enhancement of magnetic interactions as well as the appearance of ferroelectricity in BixCo2−xMnO4 (0≤x≤0.3) is discussed.
PACS
75.80.+q Magnetomechanical and magnetoelectric effects, magnetostriction
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
78.70.Dm X-ray absorption spectra
77.84.Bw Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.
75.30.Cr Saturation moments and magnetic susceptibilities
75.50.Gg Ferrimagnetics
Subjects
Condensed matter: electrical, magnetic and optical
Dates
Issue 40 (7 October 2009)
Received 28 七月 2009
Published 17 九月 2009
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Bi-substitution-induced magnetic moment distribution in spinel BixCo2−xMnO4 multiferroic
N E Rajeevan et al 2009 J. Phys.: Condens. Matter 21 406006