Magnetic anisotropy in nanocrystalline Co-doped ZnO thin films

Subramanian, M.; Tanemura, Masaki; Hihara, Takehiko; Ganesan, V.; Soga, Tetsuo; Jimbo, Takashi

doi:10.1016/j.cplett.2010.01.037

Cited by 33 publications

(14 citation statements)

References 38 publications

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“…5). This result is in contrast with the reported data [13,15] where a blue shift of the absorption edge was observed. On the other side, a similar trend of decrease of the band edge in O Co Zn…”

Section: Resultscontrasting

confidence: 99%

Structural and optical properties of Zn1-xCoxO thin films prepared by RF reactive sputtering technique

Савчук¹

2014

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract.We have reported the effect of Co doping on structural and optical properties of ZnO thin films prepared by the RF reactive sputtering technique. The composite targets were formed by mixing and pressing ZnO and CoO powders. The thin films were deposited on silica and glass substrates. The structures of samples have been studied by using X-ray diffraction (XRD) and atomic force microscopy (AFM). With the sensitivity of the XRD instruments, the structural analyses of Co-doped ZnO films reveal formation of predominant (002) reflection corresponding to the hexagonal wurtzite structure without any secondary phase. The AFM study showed that surface morphology of the O Co Znfilms is composed of closely packed nanocrystallites with nanorod shape. The optical properties of the samples were studied using UV-vis absorption and PL spectra. The optical absorption spectra show a red shift of the band edge, which indicates that Co 2+ ions substitute Zn 2+ ions in ZnO lattice. In the room-temperature photoluminescence spectra, four main peaks were revealed in all the samples, which are attributed to ultraviolet, violet-blue, blue and green emission.

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Section: Resultscontrasting

confidence: 99%

Structural and optical properties of Zn1-xCoxO thin films prepared by RF reactive sputtering technique

Савчук¹

2014

Semicond. Phys. Quantum Electron. Optoelectron.

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“…7). This result is in contrast with the reported data [16,18], where blue shift of the absorption edge was observed. On the other side, a similar trend of decrease of band edge in Zn 1-x Co x O films is reported by many workers [5,17,19].…”

Section: Transmittancecontrasting

confidence: 99%

Structural and optical properties of Co and Ni doped ZnO thin films prepared by RF magnetron sputtering

Stolyarchuk

Kleto

Dziedzic

2017

PCSS

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We have reported the effect of Co and Ni doping on structural and optical properties of ZnO thin films prepared by RF reactive sputtering technique. The composite targets were formed by mixing and pressing of ZnO, Mn 3 O 4 , CoO and NiO powders. The thin films were deposited on sapphire, quartz and glass substrates. The structure study confirms the formation of the hexagonal wurtzite ZnO without any secondary phase in transition metal (Co, Ni) -doped samples. Cross-sectional TEM images of all studied samples show a denseand uniformly textured structure composed of column-like structure along the growth direction. The surface morphology of the thin films was studied using atomic force microscopy (AFM). Different surface morphology (AFM) images were obtained depending on the film composition and growth conditions. Optical absorption spectra suggest of substitution Zn 2+ ions in ZnO lattice by transition metal atoms. The shift of the absorption edge due to decrease the energy band gap with increasing cobalt content and complex dependence of the energy band gap on content of nickel was observed in optical absorption spectra of the studied films. The room temperature photoluminescence peaks are attributed to near band gap emission and vacancy or defect states.

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“…23,26,28,40 There have been quite a few systematic analyses on defect formation and relation of these defects with dopant atoms, such as transition metals or nonmagnetic elements, in the lattice. In addition to the effects of transition metals substitution for host anion atoms in lattice, the point defects are also effective on the physical properties, such as ferromagnetic behavior, 41,42 optical transitions, [25][26][27] and electrical properties 26 due to the formation of shallow energy levels.…”

Section: Introductionmentioning

confidence: 99%

The effects of postdeposition annealing conditions on structure and created defects in Zn_0.90Co_0.10O thin films deposited on Si(100) substrate

et al. 2013

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We analyze the effect of postdeposition annealing conditions on both the structure and the created defects in Zn 0.90 Co 0.10 O thin films, which deposited on the Si(100) substrates by the radio frequency magnetron sputtering technique using a homemade target. The dependence of the number and distribution of defects in homogeneously substituted Co 12 for Zn 12 ions in ZnO lattice on the annealing conditions is investigated. Orientations of thin films are in the [0002] direction with a surface roughness changing from 67 6 2 nm to 25.8 6 0.6 nm by annealing. The Co 12 ion substitution, changing from 7.5% 6 0.3% to 8.8 6 0.3%, leads to the formation of Zn-O-Co bonds instead of Zn-O-Zn bonds and splitting of the Co 2p energy level to Co 2p 1/2 and Co 2p 3/2 with an energy difference of 15.67 6 0.06 eV. The defects in the lattice are revealed from the correlations between Zn-O-Co bonds and intensity of the Raman peak at around 691 cm À1 . In addition, the asymmetry changes of O 1s peak positions in the x-ray photoelectron spectra are in agreement with the Raman results.

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Magnetic anisotropy in nanocrystalline Co-doped ZnO thin films

Cited by 33 publications

References 38 publications

Structural and optical properties of Zn1-xCoxO thin films prepared by RF reactive sputtering technique

Structural and optical properties of Zn1-xCoxO thin films prepared by RF reactive sputtering technique

Structural and optical properties of Co and Ni doped ZnO thin films prepared by RF magnetron sputtering

The effects of postdeposition annealing conditions on structure and created defects in Zn_0.90Co_0.10O thin films deposited on Si(100) substrate

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Magnetic anisotropy in nanocrystalline Co-doped ZnO thin films

Cited by 33 publications

References 38 publications

Structural and optical properties of Zn1-xCoxO thin films prepared by RF reactive sputtering technique

Structural and optical properties of Zn1-xCoxO thin films prepared by RF reactive sputtering technique

Structural and optical properties of Co and Ni doped ZnO thin films prepared by RF magnetron sputtering

The effects of postdeposition annealing conditions on structure and created defects in Zn0.90Co0.10O thin films deposited on Si(100) substrate

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The effects of postdeposition annealing conditions on structure and created defects in Zn_0.90Co_0.10O thin films deposited on Si(100) substrate