Co-metal clustering as the origin of ferromagnetism in Co-doped ZnO thin films

By J. Park, Min Gyu Kim, H. Jang, S. Ryu, Young Mo Kim. 2004

594 citations recorded by the source corpus.

The origin of ferromagnetism in ZnO-based systems was investigated using Co-doped ZnO thin films as prototypical examples of II–VI-based diluted magnetic semiconductors. In spite of the atomic-scale dissolution of Co ions in wurtzite ZnO, both the magnetization-temperature curve and the magnetization-field curve demonstrated that Zn1−xCoxO thin films were paramagnetic for x⩽0.12. On the other hand, Zn1−xCoxO films with x greater than 0.12 were characterized by the Co-metal clustering and apparently showed room-temperature ferromagnetism. The discrepancy between the zero-field cooling and the field cooling curves further indicates that Co-doped ZnO films (for x>0.12) are superparamagnetic and the observed ferromagnetism originates from the nanometer-sized Co clusters.

Subfields: Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/a005f0a08ea4770090961e766fec3ed2280ecdc8

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Electronic, Optical and Magnetic Materials

1. M. Chisholm
2. S. Pearton
3. M. Ivill
4. A. Hebard
5. P. Sadik
6. J. Budai
7. L. Leu
8. R. Das

In Materials Chemistry

1. M. Chisholm
2. S. Pearton
3. D. Norton
4. M. Ivill
5. A. Hebard
6. P. Sadik
7. J. Budai
8. L. Leu

Citations in the corpus

• Structure and magnetism of cobalt-doped ZnO thin films (2008, methodology): “Many groups have confirmed that Co atomically substitutes on Zn sites using a variety of methods, including EXAFS [58, 59], XPS [37], [60]–[62], MCD [18, 37, 57, 59], XAS [36, 59, 63], ESR [64], XANES [65] and optical absorption [30, 37, 57, 66, 67].”