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Oxygen vacancy controlled tunable magnetic and electrical transport properties of (Li, Ni)-codoped ZnO thin films
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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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EXAFS and XANES investigation of (Li, Ni) codoped ZnO thin films grown by pulsed laser deposition
Lorenzo Mino,Diego Gianolio,Fabrizio Bardelli,Carmelo Prestipino,E. Senthil Kumar,F. Bellarmine,M. Ramanjaneyulu,Carlo Lamberti,M. S. Ramachandra Rao +8 more
TL;DR: Preliminary investigations on the Zn K-edge of the undoped and doped ZnO thin films revealed that doping has not influenced the average Zn-Zn bond length and Debye-Waller factor, which shows that both Ni and Li doping do not appreciably affect the average local environment of Zn.
Journal ArticleDOI
Structural, optical, electrical and magnetic studies of ultrasonically sprayed ZnO thin films doped with vanadium
Emrah Sarica,V. Bilgin +1 more
TL;DR: In this article, undoped and vanadium (V) doped (3, 6, 9 and 12 mol%) ZnO thin films were deposited onto glass substrates at the substrate temperature of 400 ± 5 °C by ultrasonic spray pyrolysis technique.
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Microstructure and Magnetic Properties of Ni:ZnO Nanorod/Zn:NiO Nanowall Composite Structures
TL;DR: In this paper, the microstructure, growth mechanism, and ferromagnetic (FM)/antiferromagnetic coupling have been discussed in Ni:ZnO nanorod/Zn:NiO nanowall composite structures.
Journal ArticleDOI
Room temperature ferromagnetism in Ist group elements codoped ZnO:Fe nanoparticles by co-precipitation method
TL;DR: In this paper, the structural, vibrational and magnetic behavior of Ist group elements (Li +, Na + and K + ) codoping effect in ZnO:Fe nanoparticles (NPs) prepared by co-precipitation method was reported.
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Long-range ferromagnetic order induced by a donor impurity band exchange in SnO2:Er3+ nanoparticles
TL;DR: In this paper, the structural and magnetic properties of Er-doped SnO2 (SnO2:Er) nanoparticles are reported, and the estimated mean crystallite size shows a decrease from ∼10 to ∼4 nm when the Er content is increased from 1.0% to 10.0%.
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.