Role of valence-band Co 3d states on ferromagnetism in Zn1-xCoxO nanorods.

Authors :: Chiou, J. W.
Tsai, H. M.
Pao, C. W.
Krishna Kumar, K. P.
Chen, J. H.
Ling, D. C.
Chien, F. Z.
Pong, W. F.
Tsai, M.-H.
Wu, J. J.
Yang, M.-H.
Liu, S. C.
Hong, I.-H.
Chen, C.-H.
Lin, H.-J.
Lee, J. F.
Source :: Applied Physics Letters; 2/5/2007, Vol. 90 Issue 6, p062103-N.PAG, 3p, 4 Graphs
Publication Year :: 2007
Abstract: This work investigates the electronic and ferromagnetic properties of Zn<subscript>1-x</subscript>Co<subscript>x</subscript>O nanorods using x-ray absorption, x-ray magnetic circular dichroism, and scanning photoelectron microscopy methods. The magnetic moment of Co ions in Zn<subscript>1-x</subscript>Co<subscript>x</subscript>O nanorods is found greatly reduced relative to that of the Co metal. The intensities of valence-band features near the valence-band maximum/Fermi level (E<subscript>F</subscript>) of ferromagnetic nanorods are substantially larger than those of weaker ferromagnetic nanorods, suggesting that the occupation of near-E<subscript>F</subscript> valence-band Co 3d states is important in determining the ferromagnetic behavior in Zn<subscript>1-x</subscript>Co<subscript>x</subscript>O nanorods. [ABSTRACT FROM AUTHOR]