Electron carrier-mediated room temperature ferromagnetism in anatase (Ti,Co)O2
Tomoteru Fukumura, Yoshinori Yamada, Kazunori Ueno, Hongtao Yuan,, Hidekazu Shimotani, Yoshihiro Iwasa, Lin Gu, Susumu Tsukimoto, Yuichi, Ikuhara, Masashi Kawasaki
TL;DR
This paper reviews the fundamental properties of anatase (Ti,Co)O2 and discusses how electron carriers mediate room temperature ferromagnetism, highlighting recent experimental control methods like electric field effect and chemical doping.
Contribution
It provides a comprehensive review of the carrier-mediated ferromagnetism mechanism in anatase (Ti,Co)O2, emphasizing the role of electrons based on recent experimental findings.
Findings
Electrons play a principal role in mediating ferromagnetism.
Electric field effect can control ferromagnetism at room temperature.
Chemical doping influences the magnetic properties of (Ti,Co)O2.
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., Science 332, 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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