Journal ArticleDOI
Room-Temperature Ferromagnetism in Transparent Transition Metal-Doped Titanium Dioxide
Yuji Matsumoto,Makoto Murakami,T. Shono,Tetsuya Hasegawa,Tomoteru Fukumura,Masashi Kawasaki,Parhat Ahmet,Toyohiro Chikyow,Shin-ya Koshihara,Hideomi Koinuma +9 more
TLDR
The observation of transparent ferromagnetism in cobalt-doped anatase thin films with the concentration of cobalt between 0 and 8% is reported, indicating the existence of ferromagnetic long-range ordering.Abstract:
Dilute magnetic semiconductors and wide gap oxide semiconductors are appealing materials for magnetooptical devices. From a combinatorial screening approach looking at the solid solubility of transition metals in titanium dioxides and of their magnetic properties, we report on the observation of transparent ferromagnetism in cobalt-doped anatase thin films with the concentration of cobalt between 0 and 8%. Magnetic microscopy images reveal a magnetic domain structure in the films, indicating the existence of ferromagnetic long-range ordering. The materials remain ferromagnetic above room temperature with a magnetic moment of 0.32 Bohr magnetons per cobalt atom. The film is conductive and exhibits a positive magnetoresistance of 60% at 2 kelvin.read more
Citations
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Journal ArticleDOI
Spintronics: a spin-based electronics vision for the future.
Stuart A. Wolf,Stuart A. Wolf,David D. Awschalom,Robert A. Buhrman,J. M. Daughton,S. von Molnar,Michael L. Roukes,Almadena Chtchelkanova,Daryl Treger +8 more
TL;DR: This review describes a new paradigm of electronics based on the spin degree of freedom of the electron, which has the potential advantages of nonvolatility, increased data processing speed, decreased electric power consumption, and increased integration densities compared with conventional semiconductor devices.
Journal ArticleDOI
The surface science of titanium dioxide
TL;DR: Titanium dioxide is the most investigated single-crystalline system in the surface science of metal oxides, and the literature on rutile (1.1) and anatase surfaces is reviewed in this paper.
Journal ArticleDOI
Photoinduced reactivity of titanium dioxide
TL;DR: In this paper, photo-induced superhydrophilicity was used on the surface of a wide-band gap semiconductor like titanium dioxide (TiO 2 ) for photocatalytic activity towards environmentally hazardous compounds.
Journal ArticleDOI
Donor impurity band exchange in dilute ferromagnetic oxides.
TL;DR: It is proposed thatferromagnetic exchange here, and in dilute ferromagnetic nitrides, is mediated by shallow donor electrons that form bound magnetic polarons, which overlap to create a spin-split impurity band.
Journal ArticleDOI
Ferromagnetism above room temperature in bulk and transparent thin films of Mn-doped ZnO
Parmanand Sharma,Parmanand Sharma,Amita Gupta,K. V. Rao,Frank J. Owens,Renu Sharma,Rajeev Ahuja,J. M. Osorio Guillen,Börje Johansson,Börje Johansson,G. A. Gehring +10 more
TL;DR: The first observations of ferromagnetism above room temperature for dilute (<4 at%) Mn-doped ZnO semiconductors are reported, promising new spintronic devices as well as magneto-optic components.
References
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Electrochemical Photolysis of Water at a Semiconductor Electrode
Akira Fujishima,Kenichi Honda +1 more
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Journal ArticleDOI
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TL;DR: The observed isotropic giant magnetoresistance (GMR) in nonmultilayer magnetic systems using granular magnetic solids is shown to occur in magnetically inhomogeneous media containing nonaligned ferromagnetic entities on a microscopic scale.
Journal ArticleDOI
Material Design for Transparent Ferromagnets with ZnO-Based Magnetic Semiconductors
TL;DR: Ferromagnetic ordering of ZnO-based magnetic semiconductors was investigated by ab initio calculations based on the local density approximation in this article, and it was shown that 3D transition metal atoms of V, Cr, Fe, Co and Ni showed the ferromagnetic order of their magnetic moments in ZnOs without any additional carrier doping treatments.