Exchange bias in GeMn nanocolumns: the role of surface oxidation
| Autor: | Tardif, S., Cherifi, S., Jamet, M., Devillers, T., Barski, A., Schmitz, D., Darowski, N., Thakur, P., Cezar, J. C., Brookes, N. B., Mattana, R., Cibert, J. |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | APPLIED PHYSICS LETTERS 97, 062501 (2010) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/1.3476343 |
| Popis: | We report on the exchange biasing of self-assembled ferromagnetic GeMn nanocolumns by GeMn-oxide caps. The x-ray absorption spectroscopy analysis of this surface oxide shows a multiplet fine structure that is typical of the Mn2+ valence state in MnO. A magnetization hysteresis shift |HE|~100 Oe and a coercivity enhancement of about 70 Oe have been obtained upon cooling (300-5 K) in a magnetic field as low as 0.25 T. This exchange bias is attributed to the interface coupling between the ferromagnetic nanocolumns and the antiferromagnetic MnO-like caps. The effect enhancement is achieved by depositing a MnO layer on the GeMn nanocolumns. Comment: 7 pages, 5 figures |
| Databáze: | arXiv |
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