Magnetic properties in Co and Mn-doped ZnO powders and thin films.
Zn0.86Co0.14O powder and thin films were prepared by standard solid-state reaction processes and radio-frequency (RF) magnetron sputtering. Magnetic measurements indicate that the powder is paramagnetic for temperatures above 3 K, while the thin films annealed in vacuum are ferromagnetic at room temperature. The saturated magnetization was found to be about 0.6 microB/Co, while the coercive force was found to be 200 Oe at room temperature. The very similar results were also obtained in Zn0.96Mn0.04O powder and thin films. Such different results for the powder and thin films indicate that growth conditions and defects play an important role in producing ferromagnetism.
Department of Physics, Hebei Normal University, Shijiazhuang 050016, Hebei, China.
X J
XJ
Ye
R B
RB
Zhao
D L
DL
Hou
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XY
Zhao
H J
HJ
Meng
H J
HJ
Zhou
X L
XL
Li
C M
CM
Zhen
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Tang