COMPARISON OF MAGNETIC PROPERTY OF Cu-, Al-, AND Li-DOPED ZnO DILUTE MAGNETIC SEMICONDUCTOR THIN FILMS
L. H. VAN
M. H. HONG
Z. C. FAN
The properties of Cu-, Al-, and Li-doped ZnO dilute magnetic semiconductor (DMS) have been analyzed and compared. Zincite with wurtzite structures have been synthesized successfully on SiO2 (101) and SiO2 (110) substrates in both the CuâZnO and LiâZnO DMS. The highly textured ZnO (002) peaks were able to form in the CuâZnO system at 400Â°C. However, it formed at even much lower temperature in the LiâZnO system, that is only 25Â°C. ZnO (002) peaks in both systems were formed without any impurity phases. However, no crystalline structure is synthesized in the AlâZnO system. The thin films formed are amorphous. The structural and related magnetic properties of the films were analyzed by XRD, AFM, and VSM. The films were found to be at their highest magnetism at the value of 3.1 emu/cm3 for CoâZnO and 2.5 emu/cm3 for LiâZnO, synthesized at 400Â°C, and under 1 Ã 10-4 Torr oxygen partial pressure.
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