Enhancement of ferromagnetic properties in Zn1-xCoxO by additional Cu doping

Hung-Ta Lin; Tsung-Shune Chin; Jhy-Chau Shih; Show-Hau Lin; Tzay-Ming Hong; Rong-Tan Huang; Fu-Rong Chen; Ji-Jung Kai
July 2004
Applied Physics Letters;7/26/2004, Vol. 85 Issue 4, p621
Academic Journal
The high-temperature ferromagnetism in Co-doped ZnO samples fabricated by the standard solid-state reaction method is reported. Additional Cu doping into bulk Zn0.98Co0.02O is essential to achieve room-temperature ferromagnetism. Structure and composition analyses revealed that cobalt is incorporated into the lattice structure, forming a solid solution instead of precipitates. In the case of Zn0.97Cu0.01Co0.02O, the coercive field measured by a vibrating sample magnetometer at room temperature is 60 Oe. The implication of the effect of Cu doping in bulk Zn0.98Co0.02O is also discussed.


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