Zno.95-xCoo.05CuxO （atomic ratio, x = 0-8%） thin films are fabricated on Si（lll） substrate by reactive magnetron sputtering method. Detailed characterizations indicate that the doped Cu ions substitute the Zn2＋ i...Zno.95-xCoo.05CuxO （atomic ratio, x = 0-8%） thin films are fabricated on Si（lll） substrate by reactive magnetron sputtering method. Detailed characterizations indicate that the doped Cu ions substitute the Zn2＋ ions in ZnO lattice. The doped Cu ions are in ＋1 and ＋2 mixture valent state. The ferromagnetism of the Zno.95-xCoo.o5CuxO film increases gradually with the increase of the Cu＋ ion concentration till x = 6%, but decreases for higher Cu concentration. Experimental results indicate that the increase of ferromagnetism is not owing to the magnetic contribution of Cu＋ ions themselves, but owing to the enhancement of magnetic interaction between Co2＋ ions, which suggests that p-type doping of Cu＋ ions plays an important role in mediating the ferromagnetic coupling between Co ions.展开更多
基金the Basic Scientific Research Business Expenses of the Central UniversityOpen Project of Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education,Lanzhou University (No.LZUMMM2012001)the Natural Science Foundation of Anhui Province(No.1208085ME84)
文摘Zno.95-xCoo.05CuxO （atomic ratio, x = 0-8%） thin films are fabricated on Si（lll） substrate by reactive magnetron sputtering method. Detailed characterizations indicate that the doped Cu ions substitute the Zn2＋ ions in ZnO lattice. The doped Cu ions are in ＋1 and ＋2 mixture valent state. The ferromagnetism of the Zno.95-xCoo.o5CuxO film increases gradually with the increase of the Cu＋ ion concentration till x = 6%, but decreases for higher Cu concentration. Experimental results indicate that the increase of ferromagnetism is not owing to the magnetic contribution of Cu＋ ions themselves, but owing to the enhancement of magnetic interaction between Co2＋ ions, which suggests that p-type doping of Cu＋ ions plays an important role in mediating the ferromagnetic coupling between Co ions.
