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1 Aug 2005

Volume 87, Issue 5, Articles (05xxxx)

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Appl. Phys. Lett. 87, 054101 (2005); http://dx.doi.org/10.1063/1.2006209 (3 pages)

Xiuqin Chen, S. Yang, M Hasegawa, K. Kawabe, and S. Motojima
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Antiferromagnetism in bulk Zn1−xCoxO magnetic semiconductors prepared by the coprecipitation technique

M. Bouloudenine, N. Viart, S. Colis, J. Kortus, and A. Dinia

Appl. Phys. Lett. 87, 052501 (2005); http://dx.doi.org/10.1063/1.2001739 (3 pages) | Cited 42 times

Online Publication Date: 25 July 2005

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Polycrystalline Zn1−xCoxO diluted magnetic semiconductors have been prepared by coprecipitation technique in the concentration range 0 ⩽ x ⩽ 0.1. Structure, composition analysis, and optical absorption measurements revealed that cobalt is incorporated into the lattice, as Co2+ substituting Zn2+ ions, forming a solid solution with wurtzite structure instead of Co precipitates. Room- and low-temperature magnetization measurements reveal a paramagnetic behavior for the Co-doped ZnO samples with a paramagnetic Co amount smaller than the nominal concentration. χT versus T evidenced that the remaining Co is antiferromagnetically coupled through oxygen. This is further supported by a simple model that shows that as the Co concentration increases the amount of nearest neighbors Co atoms increases thus giving antiferromagnetic coupling and reducing the paramagnetic contribution.
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75.50.Pp Magnetic semiconductors
75.30.Gw Magnetic anisotropy
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