Abstract
Since the discovery of room temperature ferromagnetism in ( Ti,Co ) O2 , the mechanism has been under discussion for a decade. Particularly, the central concern has been whether or not the ferromagnetic exchange interaction is mediated by charge carriers like ( Ga,Mn ) As . Recent two studies on the control of ferromagnetism in anatase ( Ti,Co ) O2 at room temperature via electric field effect [Y. Yamada et al., Science332, 1065 (2011)] and chemical doping [Y. Yamada et al., Appl. Phys. Lett.99, 242502 (2011)] indicate a principal role of electrons in the carrier-mediated exchange interaction. In this article, the authors review fundamental properties of anatase ( Ti,Co ) O2 and discuss the carrier mediated ferromagnetism.
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