Issue
EPL
Volume 78, Number 1, April 2007
Article Number 17001
Number of page(s) 4
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/78/17001
Published online 09 March 2007
EPL, 78 (2007) 17001
DOI: 10.1209/0295-5075/78/17001

Magnetism depending on carrier in (Zn,Co)O

H.-J. Lee1, 2, H.-H. Nam2, Y.-C. Cho3, S.-K. Kim1, C. H. Park1, 2, C. R. Cho4 and S.-Y. Jeong3

1  Research Center for Dielectric and Advanced Matter Physics, Pusan National University - Busan 609-735, Korea
2  Department of Physics, Pusan National University - Busan 609-735, Korea
3  Department of Nanomaterials Engineering, Pusan National University - Busan 609-735, Korea
4  Department of Nanomedical Engineering and JRC of PNU-Fraunhofer IGB, Pusan National University Miryang 627-706, Korea

syjeong@pusan.ac.kr

received 20 October 2006; accepted in final form 6 February 2007; published April 2007
published online 9 March 2007

Abstract
The ferromagnetic properties of (Zn,Co)O were observed by a magnetometer at low temperatures. This is, however, inconsistent with the results from the magneto-optical measurements. They reflect the presence of Co metal precipitates in (Zn,Co)O. On the other hand, the formation of Co metal precipitates was strongly suppressed by the additional Cu doping. It appears that the formation of Co metal precipitates is related to the carrier concentration in the system.

PACS
75.50.Pp - Magnetic semiconductors.
61.72.Vv - Doping and impurity implantation in III-V and II-VI semiconductors.
71.20.-b - Electron density of states and band structure of crystalline solids.

© Europhysics Letters Association 2007