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Magnetization‐induced optical second harmonic generation from the surface of Co‐doped rutile TiO 2 (110)
Author(s) -
Watanabe R.,
Yuasa M.,
Yahata Y.,
Mizutani G.,
Suzuki T.,
Segawa Y.,
Matsumoto Y.,
Yamamoto Y.,
Koinuma H.
Publication year - 2008
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.2907
Subject(s) - rutile , magnetization , x ray photoelectron spectroscopy , hysteresis , second harmonic generation , ferromagnetism , magnetism , condensed matter physics , materials science , doping , absorption (acoustics) , kerr effect , surface layer , analytical chemistry (journal) , chemistry , layer (electronics) , magnetic field , optics , nuclear magnetic resonance , nanotechnology , physics , laser , organic chemistry , quantum mechanics , nonlinear system , chromatography , composite material
We have investigated the surface magnetism of 5 at% Co‐doped rutile TiO 2 (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 2 ħ ω = 2.33 eV and 2 ħ ω = 4.20 eV. MSH intensity showed a hysteresis as a function of the external magnetic field for the second harmonic photon energy of 2 ħ ω = 4.20 eV at which the absorption length limits the MSHG origin to the surface layer of 10 nm due to the TiO 2 bulk. Since 5 at% Co: TiO 2 (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. Copyright © 2008 John Wiley & Sons, Ltd.