Magnetism and stability of the Co:TiO₂(1 0 0) interface probed by X-ray photoemission and ex situ magnetometry

详细信息	查看全文 | 推荐本文 |

• 作者：L. Sangaletti ; F. Federici Canova ; A. Sepe ; S. Pagliara ; M.C. Mozzati ; P. Galinetto ; C.B. Azzoni ; A. Speghini ; M. Bettinelli
• 关键词：Rutile ; Ferromagnetism ; Photoemission ; Cobalt ; Raman spectroscopy
• 刊名：Surface Science
• 出版年：2007
• 期刊代码：104_00396028
• 类别：ch
• 出版时间：15 September 2007
• 卷：601
• 期：18
• 页码：4375-4380
• 文件大小：455 K

摘要

Ferromagnetic Co:TiO₂ thin films have been grown by Co evaporation on a sputtered TiO₂(1 0 0) surface. Annealing in ultra-high vacuum induced a recovery of the oxygen stoichiometry and consequently the oxidation of titanium to Ti⁴⁺ at the surface, while oxidation of the Co layer has not been observed. Room temperature ferromagnetism is observed, along with a paramagnetic contribution. Differences of the hysteresis cycle with respect to that usually observed for bulk cobalt are ascribed both to the reduced film thickness and to the disorder induced by the sputtering treatment.