Structural, magnetic properties and photoemission study of Ni-doped ZnO

Yin, Zhong‐Ping; Chen, Nuofu; Yang, Fei; Song, Shu-lin; Chai, Chuan; Zhong, Jun; Huang, Qian; Ibrahim, Kurash

doi:10.1016/j.ssc.2005.05.024

Cited by 129 publications

(55 citation statements)

References 21 publications

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“…18 have reported that Co-doped in ZnO films exhibit FM above RT, though Ni-, Cr-and Mn-doped ZnO films do not display any indication of ferromagnetic behavior. Yin et al have also verified that there is no ferromagnetism observed in Ni doped ZnO films 19 . B.…”

Section: Introduction This Paper Published In Acs Applied Materials Andmentioning

confidence: 95%

Search for Origin of Room Temperature Ferromagnetism Properties in Ni-Doped ZnO Nanostructure

Rana

Kumar

Rajput

et al. 2017

ACS Appl. Mater. Interfaces

111

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Section: Introduction This Paper Published In Acs Applied Materials Andmentioning

confidence: 95%

Search for Origin of Room Temperature Ferromagnetism Properties in Ni-Doped ZnO Nanostructure

Rana

Kumar

Rajput

et al. 2017

ACS Appl. Mater. Interfaces

111

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“…The binding energies of the Ni 2p 3/2 and Ni 2p 1/2 photoemission lines are determined as ϳ855.2 eV and 872.2 eV, respectively, showing that the valence state of the Ni ions in the sample is +2. 18,33 Meanwhile, the Ni 2p 3/2 main spectral feature has a satellite peak at ϳ861.0 eV, which is typical for the Ni 2+ cation at tetrahedral sites within the wurtzite ZnO structure. Figure 3 compares the magnetic hysteresis ͑M-H͒ loops measured at RT for the as-synthesized Zn 1−x Ni x O ͑x = 0.01 to 0.20͒ powders.…”

Section: A Structural Characteristics By X-raysmentioning

confidence: 99%

“…In contrast to the above cases, there are also reports of the absence of RT-FM in ZnO:Ni films. 17,18 Up to now, it is not clear whether the observed RT-FM in Ni-doped ZnO is a truly intrinsic property or is related to the formation of secondary phases such as magnetic clusters.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence studies on structural defects and room temperature ferromagnetism in Ni and Ni–H doped ZnO nanoparticles

Tong

Chen

Han

et al. 2010

Journal of Applied Physics

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We explore the effects of hydrogenated annealing on the crystal structure, room temperature ferromagnetism (RT-FM) and photoluminescence (PL) properties of Ni-doped ZnO (Zn1−xNixO, x=0.0 to 0.2) nanoparticles prepared by a sol-gel method. The x-ray photoelectron spectra and x-ray diffraction data provide evidence that Ni has been incorporated into the wurtzite ZnO lattice as Ni2+ ions substituting for Zn2+ ions at x≤0.05. A secondary phase of NiO type begins to form inside ZnO when x>0.05 and segregates from ZnO host lattice at x=0.2, leading to a large variation in the lattice constants of ZnO. The magnetization measurements show that the saturation magnetization (Ms) increases with increasing Ni concentration in the single-phase Zn1−xNixO (x≤0.05) nanoparticles. The secondary phase formation reduces the magnetization of Zn1−xNixO (x=0.1 and 0.15), while the segregation of NiO from the ZnO lattice at x=0.2 is accompanied by a large increase in Ms again. The PL measurements show that the UV emission intensity of single-phase Zn1−xNixO (x≤0.05) nanoparticles increases with a blueshift in the UV emission line when the Ni concentration increases, while the dominant green emission intensity decreases with increasing Ni dopant. The PL data strongly suggest that the FM in single-phase Zn1−xNixO (x≤0.05) nanoparticles is intrinsically correlated with a doping induced increase in the electron concentration in the conduction band of Ni-doped ZnO. After H2-annealing, the single-phase Zn1−xNixO:H (x≤0.05) nanoparticles show increases in both coercivity and saturation magnetization. The PL and diffuse reflectance spectra suggest that hydrogen-related shallow donors and an improved sample quality may be responsible for the H2-annealing induced enhancement of the RT-FM. The obvious correlation between FM and carrier concentration in Ni and Ni–H doped ZnO points towards a mechanism of carrier-mediated FM for Ni-doped ZnO diluted magnetic semiconductors.

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“…Doping of Ni in ZnO matrix has been done by several techniques [10][11][12], however, effect on resistivity of ZnO on Ni doping is not well established so far. Films grown by rf magnetron sputtering were found to be insulating up to a Ni concentration of 20% [11].…”

Section: Introductionmentioning

confidence: 99%

“…Films grown by rf magnetron sputtering were found to be insulating up to a Ni concentration of 20% [11]. The Ni-doped (2 mol %) ZnO films prepared by spin coating showed a resistivity of 1.4 × 10 −1 Ω cm [13].…”

Section: Introductionmentioning

confidence: 99%

Study of ZnO and Ni-doped ZnO synthesized by atom beam sputtering technique

et al. 2007

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Zinc oxide (ZnO) and Ni-doped zinc oxide (ZnO:Ni) films are prepared by atom beam sputtering with an intent of growing transparent conducting oxide (TCO) material and understanding its physical properties. The crystalline phases of the films are identified by the grazing angle X-ray diffraction (GAXRD) technique. Thicknesses of the films are measured by ellipsometry. Chemical states of the elements present in the films are investigated by X-ray photoelectron spectroscopy (XPS), which indicates the presence of Ni in the ZnO environment in a divalent state. Average transmission across the ZnO:Ni film was determined to be ∼ 83% in the visible region, which is less than that (∼ 90%) of undoped ZnO films. The resistivity measured by van der Pauw technique of the ZnO:Ni film (∼ 9 × 10 −3 Ω cm) is two orders of magnitude smaller as compared to its undoped counterpart (1 Ω cm). For ZnO:Ni film an average carrier concentration of ∼ 1.4 × 10 19 cm −3 was observed by Hall measurements. Two important mechanisms reported in the literature viz. influence of d-d transition bands and electron scattering from crystallites/grains are discussed as the possible causes for the increase in conductivity on Ni doping in ZnO.

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Structural, magnetic properties and photoemission study of Ni-doped ZnO

Cited by 129 publications

References 21 publications

Search for Origin of Room Temperature Ferromagnetism Properties in Ni-Doped ZnO Nanostructure

Search for Origin of Room Temperature Ferromagnetism Properties in Ni-Doped ZnO Nanostructure

Photoluminescence studies on structural defects and room temperature ferromagnetism in Ni and Ni–H doped ZnO nanoparticles

Study of ZnO and Ni-doped ZnO synthesized by atom beam sputtering technique

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