Exchange bias and interface electronic structure in Ni/Co3O4(011)
| Autor: | Vaz, C. A. F., Altman, E. I., Henrich, V. E. |
|---|---|
| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Physical Review B 81:104428, 2010 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.81.104428 |
| Popis: | A detailed study of the exchange bias effect and the interfacial electronic structure in Ni/Co3O4(011) is reported. Large exchange anisotropies are observed at low temperatures, and the exchange bias effect persists to temperatures well above the Neel temperature of bulk Co3O4, of about 40 K: to ~80 K for Ni films deposited on well ordered oxide surfaces, and ~150 K for Ni films deposited on rougher Co3O4 surfaces. Photoelectron spectroscopy measurements as a function of Ni thickness show that Co reduction and Ni oxidation occur over an extended interfacial region. We conclude that the exchange bias observed in Ni/Co3O4, and in similar ferromagnetic metallic/Co3O4 systems, is not intrinsic to Co3O4 but rather due to the formation of CoO at the interface. Comment: 8 pages, 6 figures. Accepted for publication in Physical Review B. |
| Databáze: | arXiv |
| Externí odkaz: |
|