Magnetic and transport properties of (Mn, Co)-codoped ZnO films prepared by radio-frequency magnetron cosputtering
- National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University, Nanjing 210093 (China)
(Mn, Co)-codoped ZnO films have been synthesized on c-sapphire (0001) by a radio-frequency magnetron sputtering system in which two targets were sputtered together. X-ray-diffraction measurements indicate that the films are highly c-axis oriented. X-ray photon spectra show that the doped Mn and Co ions in (Mn, Co) ZnO films are both in the divalent states. The films show ferromagnetic behavior with a coercivity of about 90 Oe and a saturation moment of 0.11{mu}{sub B}/(0.3Mn{sup 2+}+0.7Co{sup 2+}) at 300 K. In the lower temperatures between 5 and 20 K, a relatively large positive magnetoresistance over 10% was observed for (Mn{sub 0.03}, Co{sub 0.07})Zn{sub 0.90}O film. The number of carrier concentration is experimentally established to be 1.5613x10{sup 18} cm{sup -3} and the mobility to be 2.815 cm{sup 2} V{sup -1} s{sup -1} for (Mn{sub 0.03}, Co{sub 0.07})Zn{sub 0.90}O film by Hall measurements at 300 K. The origins of the room-temperature magnetism and the large positive magnetoresistance are also discussed.
- OSTI ID:
- 20714088
- Journal Information:
- Journal of Applied Physics, Vol. 98, Issue 5; Other Information: DOI: 10.1063/1.2039279; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARRIER DENSITY
CARRIER MOBILITY
COBALT IONS
COERCIVE FORCE
DEPOSITION
DOPED MATERIALS
FERROMAGNETIC MATERIALS
MAGNETIC MOMENTS
MAGNETISM
MAGNETORESISTANCE
MANGANESE IONS
RADIOWAVE RADIATION
SAPPHIRE
SPUTTERING
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0273-0400 K
X-RAY DIFFRACTION
ZINC OXIDES