Extraordinary Hall effect and ferromagnetism in Fe-doped reduced rutile

Wang, Zhenjun; Wang, Wendong; Tang, Jinke; Tung, Le Duc; Spinu, Leonard; Zhou, Weilie
July 2003
Applied Physics Letters;7/21/2003, Vol. 83 Issue 3, p518
Academic Journal
Room-temperature ferromagnetism is observed in reduced rutile TiO[SUB2 - δ by Fe doping. The epitaxial films grown by pulsed-laser deposition are carefully examined by x-ray diffraction, transmission electron microscopy, and magnetic and transport measurements. The films exhibit the extraordinary Hall-effect and thin-film magnetic shape anisotropy. The magnetic moments and anticipated Curie temperatures of the films rule out Fe particles, iron oxides, and Ti-Fe oxides as possible sources for the observed magnetic signals. The carriers of the Fe-doped reduced rutile are p-type, with a carrier density of 1 × 10[SUP22]/cm[SUP3]. This room-temperature dilute magnetic semiconductor should find potential applications in spintronics.


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