Room temperature (RT) ferromagnetic semiconductor rutile Ti 1-xCoxO2-δ(101) epitaxial thin films were grown on r-sapphire substrates by a dc sputtering method. Ferromagnetic magnetization, magnetic circular dichroism, and anomalous Hall effect were clearly observed at RT in sputter-grown films for the first time. The magnetization value is nearly as large as 3μβ/Co that is consistent with the high spin state Co2+ in this compound recently established by spectroscopic methods. Consequently, its originally large magneto-optical response is further enhanced.
ASJC Scopus subject areas
- Physics and Astronomy(all)