Abstract
We have investigated the surface magnetism of 5 at% Co-doped rutile TiO2(110) using magnetization-induced optical second harmonic generation (MSHG) in the longitudinal Kerr configuration with the incident beam angle of 4°. MSHG is observed at both 2hℏω = 2.33 eV and 2hℏω = 4.20 eV. MSH intensity showed a hysteresis as a function of the external magnetic field for the second harmonic photon energy of 2ℏω = 4.20 eV at which the absorption length limits the MSHG origin to the surface layer of 10 nm due to the TiO2 bulk. Since 5 at% Co: TiO2(110) is judged to have no metallic Co near the top surface by XPS, the hysteresis is attributed to a carrier-induced ferromagnetism at the surface of this material.
Original language | English |
---|---|
Pages (from-to) | 1692-1695 |
Number of pages | 4 |
Journal | Surface and Interface Analysis |
Volume | 40 |
Issue number | 13 |
DOIs | |
Publication status | Published - 2008 Dec |
Externally published | Yes |
Keywords
- Co/rutile TiO
- Dilute magnetic semiconductors
- Hysteresis
- Magnetization-induced optical second harmonic generation (MSHG)
- Surface magnetization
ASJC Scopus subject areas
- Chemistry(all)
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry