Journal ArticleDOI
Oxygen vacancy controlled tunable magnetic and electrical transport properties of (Li, Ni)-codoped ZnO thin films
TLDR
In this article, the electrical, magnetic, and magnetotransport properties of Li-Ni codoped ZnO thin films in the electron dominated, hole dominated, and insulating regimes were investigated.Abstract:
We investigated the electrical, magnetic, and magnetotransport properties of Li–Ni codoped ZnO thin films in the electron dominated, hole dominated, and insulating regimes. In a narrow window of oxygen growth pressure, 10−3–10−2 mbar, the films exhibited p-type conductivity with a maximum hole concentration ∼8.2×1017 cm−3. Magnetoresistance exhibited by the films is attributed to scattering of charge carriers due to localized magnetic moments. Insulating films showed superparamagnetic behavior, whereas both n-type and p-type films showed room temperature ferromagnetism. Our findings suggest that oxygen vacancies and Ni ions in cation site are jointly responsible for ferromagnetism that is not dependent on the carrier type.read more
Citations
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Impact of rapid thermal annealing on structural and electrical properties of ZnO thin films grown atomic layer deposition on GaAs substrates
TL;DR: In this article, the effect of thermal annealing temperature on the structural and electrical properties of thin ZnO/GaAs heterostructures has been investigated, showing that atoms interdiffusion can be observed at the interface of ZnOs and GaAs in oxygen ambience at elevated temperatures.
Journal ArticleDOI
Enhanced degradation of sulfamethoxazole by Fe-Mn binary oxide synergetic mediated radical reactions.
TL;DR: It is suggested that FMBO can act as an efficient catalyst to remove SMX in hospital wastewater using the simultaneous co-precipitation and oxidation methods and the hydroxyl radicals generated by FMBO through Fenton-like reaction were responsible for the SMX oxidation.
Journal ArticleDOI
Reactive Oxygen Species on Transition Metal‐based Catalysts for Sustainable Environmental Applications
TL;DR: In this paper , the reactive oxygen species (ROS) in advanced oxidation processes (AOP) in a controlled manner is tailored in chemical synthesis and environmental applications, which is essential in chemical applications.
Journal ArticleDOI
The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films
TL;DR: In this article, the authors studied the magnetic ordering of Mn-doped ZnO thin films that exhibited ferromagnetic ordering at 300 K and superparamagnetism at 5 K. They directly interrelated the magnetisation and magnetoresistance by invoking the polaron percolation theory and variable range of hopping conduction below the metal-to-insulator transition.
Journal ArticleDOI
Investigations of DC-magnetization behavior of nanocrystalline ZnO:Ni
TL;DR: In this article, the DC-magnetization behavior of chemically synthesized nanocrystalline ZnO:Ni powder samples has been tracked vis-a-vis the processing conditions.
References
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Journal ArticleDOI
Zener Model Description of Ferromagnetism in Zinc-Blende Magnetic Semiconductors
TL;DR: Zener's model of ferromagnetism, originally proposed for transition metals in 1950, can explain T(C) of Ga(1-)(x)Mn(x)As and that of its II-VI counterpart Zn(1)-Mn (x)Te and is used to predict materials with T (C) exceeding room temperature, an important step toward semiconductor electronics that use both charge and spin.
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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.
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Repeated temperature modulation epitaxy for p-type doping and light-emitting diode based on ZnO
Atsushi Tsukazaki,Akira Ohtomo,Takeyoshi Onuma,M. Ohtani,Takayuki Makino,Masatomo Sumiya,Keita Ohtani,Shigefusa F. Chichibu,S. Fuke,Yusaburou Segawa,Hideo Ohno,Hideomi Koinuma,Masashi Kawasaki +12 more
TL;DR: In this paper, the authors used a new technique to fabricate p-type ZnO reproducibly, and showed high-quality undoped films with electron mobility exceeding that in the bulk.
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Thin films: unexpected magnetism in a dielectric oxide.
TL;DR: It is shown that thin films of hafnium dioxide (HfO2), an insulating oxide better known as a dielectric layer for nanoscale electronic devices, can be ferromagnetic even without doping.
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Anisotropic ferromagnetism in substituted zinc oxide.
TL;DR: Results are interpreted in terms of a spin-split donor impurity-band model, which can account for ferromagnetism in insulating or conducting high-k oxides with concentrations of magnetic ions that lie far below the percolation threshold.