Characteristics of cobalt-doped zinc oxide thin films prepared by pulsed laser deposition

Jae Hyun Kim, Jae Bong Lee, Hyojin Kim, Dojin Kim, YoungEon Ihm, Woong Kil Choo
2002 IEEE transactions on magnetics  
We have characterized Zn 1 Co O thin films grown on sapphire (0001) substrates by pulsed laser deposition. We have found for = 0 25 that inhomogeneous Zn 1 Co O films with wurtzite ZnO phase mixed with rock-salt CoO and hexagonal Co phases are formed when the growth temperature ( ) is relatively high ( 600 C) and the O 2 pressure ( O ) is fairly low ( 10 5 torr). The presence of the Co clusters leads to room temperature ferromagnetism. Homogeneous Zn 1 Co O alloy films with wurtzite structure
more » ... e predominantly paramagnetic. High-quality epitaxial Zn 1 Co O alloy films are formed at a growth condition of = 600 C and O = 10 5 torr. Under this optimized growth condition, Co can be dissolved into ZnO up to around 40%. Photoluminescence spectra and electrical properties of Zn 1 Co O strongly depend on the Co content.
doi:10.1109/tmag.2002.803132 fatcat:4ji5wn54xjgqjbarbjfmjzkquu