title: Room-temperature decay and light reactivation of high-Tc ferromagnetism in an oxide-diluted magnetic semiconductor.
abstract: We present a novel route for manipulation of the ferromagnetic order in Co-doped TiO2 using UV laser irradiation. The ferromagnetic order of the nanocrystal films decays with aging in air at room temperature, which can be reactivated and enhanced by UV irradiation, whereas the coercive force reduces with irradiation time. Photoinduced trapped electrons were suggested to induce the ferromagnetic order. We believe that light manipulation is a general method for tuning the magnetic properties of oxide-based diluted magnetic semiconductors, which can find practical applications in future integrated magneto-optical nanoelectronics.
authors.affiliation: National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China. dypan@nju.edu.cn
authors.forename: Dengyu
authors.initials: D
authors.lastname: Pan
authors.forename: Jianguo
authors.initials: J
authors.lastname: Wan
authors.forename: Guoliang
authors.initials: G
authors.lastname: Xu
authors.forename: Liya
authors.initials: L
authors.lastname: Lv
authors.forename: Yujie
authors.initials: Y
authors.lastname: Wu
authors.forename: Han
authors.initials: H
authors.lastname: Min
authors.forename: Junming
authors.initials: J
authors.lastname: Liu
authors.forename: Guanghou
authors.initials: G
authors.lastname: Wang