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Detailed Program
Paper Number : TF-P09
Time Frame : 12:00~13:30
Presentation Date : Friday, 28, November
Session Name : Thin Films & Layers
Session Chair 1# : -
Session Chair 2# : -
Electronic structure and magnetic properties of Mn doped TiO2 thin films using X-ray absorption spectroscopy
Dr. Kumar Shalendra
Changwon National University
After the discovery of room temperature ferromagnetism in Co doped anatase and rutile TiO2 by Matsumoto et al., a lot of efforts have been made to develop RT-FM in TM doped TiO2. Among several wide band gap semiconductors, TiO2 is a significant material due to their outstanding properties such as excellent optical transmittance in the visible and near infrared wavelength range, high dielectric constant and low loss tangent and high index of refraction etc. Besides these potential applications, TiO2 is an ideal system for the room temperature magnetic semiconductors. In this work, we have grown the thin film of Mn doped TiO2 on LaAlO3 (001) substrate using pulsed laser deposition method. X-ray diffraction (XRD), near-edge x-ray absorption fine structure spectroscopy (NEXAFS), and magnetic hysteresis loop measurements were used to understand the origin of ferromagnetism in pristine and O2 annealed film. Our structural analysis reveals a single phase nature of the film and excludes the presence of any secondary phase. The NEXAFS spectra collected at Ti L3,2, and Mn L3,2 edge infers that Mn and Ti ions are in +2 and +4 valence state, respectively. DC magnetization hysteresis measurements reflect that of Mn doped TiO2 film exhibit ferromagnetic ordering at room temperature.
Acknowledgements : This work was supported by the Priority Research Centers Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (MEST;2012-045424) and by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIP) (2011-0030058).