Room-temperature ferromagnetism in carbon-doped ZnO.
We report ferromagnetism in carbon-doped ZnO. Our first-principles calculations based on density functional theory predicted a magnetic moment of 2.02 mu(B) per carbon when carbon substitutes oxygen in ZnO, and an ferromagnetic coupling among magnetic moments of the carbon dopants. The theoretical prediction was confirmed experimentally. C-doped ZnO films deposited by pulsed-laser deposition showed ferromagnetism with Curie temperatures higher than 400 K. The measured magnetic moment based on the content of carbide in the films [(1.5-3.0) mu(B) per carbon] was in agreement with the theoretical prediction. The magnetism is due to the Zn-C system in the ZnO environment.
Pan
H
H
Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542.
Yi
J B
JB
Shen
L
L
Wu
R Q
RQ
Yang
J H
JH
Lin
J Y
JY
Feng
Y P
YP
Ding
J
J
Van
L H
LH
Yin
J H
JH