Structural, luminescence and magnetic properties of Mn doped ZnO thin films using spin coating technique

Fatima, Anis; Devadason, Suganthi; Mahalingam, T.

doi:10.1007/s10854-014-2040-x

Cited by 21 publications

(13 citation statements)

References 31 publications

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“…10 ferromagnetism completely disappears for the sample with 10% Mn concentration as there is no hysteresis observed (figure 10). Thakur et al 36 and Fatima et al 12 have also observed that saturation magnetization decreases with increase in Mn doping concentration in ZnO thin films. Thus our magnetization result, along with the findings from XANES and EXAFS measurements (which conclusively proves the presence of oxygen vacancies in the samples and that Mn is present in the samples primarily in Mn +2 state), support the proposition that magnetization in Mn doped ZnO is governed by two competing phenomena of FM and AFM interactions.…”

Section: Fig 7 Fourier Transformed Exafs Spectra Of (A) 1% Mn Dopedmentioning

confidence: 90%

“…Mn-doped ZnO thin films grown by spin coating technique exhibits room temperature FM which decreases with increase in Mn concentration due to segregation of Mn on grain boundaries. 12 Thin films deposited by sol-gel technique also shows well defined ferromagnetism. 15 Ferromagnetism induced by zinc and oxygen defects has been observed in thin films prepared by spray technique and in this case also ferromagnetism is found to decrease at higher Mn concentration due to Mn clustring.…”

Section: Introductionmentioning

confidence: 96%

“…Coey et al predicated that ferromagnetic exchange in dilute magnetic semiconductors is mediated by shallow donor electrons. 10 Mn-doped ZnO thin films have been grown by various techniques viz., spin coating, 11,12 sol-gel, [13][14][15] spray, 16 metal organic chemical vapor deposition, 17,18 rf magnetron sputtering 19,20 and pulsed laser deposition [21][22][23][24] and their properties are found to vary widely. Kundaliya et.…”

Section: Introductionmentioning

confidence: 99%

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X-ray absorption spectroscopy of Mn doped ZnO thin films prepared by rf sputtering technique

et al. 2015

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A set of r.f. sputter deposited ZnO thin films prepared with different Mn doping concentrations have been characterised by Extended X-ray Absorption Fine Structure (EXAFS) and X-ray Absorption Near Edge Spectroscopy (XANES) measurements at Zn, Mn and O K edges and at Mn L2,3 edges apart from long range structural characterisation by Grazing Incident X-ray Diffraction (GIXRD) technique. Magnetic measurements show room temperature ferromagnetism in samples with lower Mn doping which is however, gets destroyed at higher Mn doping concentration. The results of the magnetic measurements have been explained using the local structure information obtained from EXAFS and XANES measurements.

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Section: Fig 7 Fourier Transformed Exafs Spectra Of (A) 1% Mn Dopedmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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X-ray absorption spectroscopy of Mn doped ZnO thin films prepared by rf sputtering technique

et al. 2015

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“…has also been regarded as an ideal material for short wavelength magneto optical applications because of its wide band gap and the thermal solubility of Mn 2? in ZnO [11][12][13]. It can be concluded from previous reports that the magnetic properties of Mn 2?…”

Section: Introductionmentioning

confidence: 77%

A simple sonochemical approach of Mn2+ doped ZnO nanopowder: structural, optical and magnetic studies

Babu

Nagajyothi

Shin

et al. 2015

J Mater Sci: Mater Electron

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Mn 2? doped ZnO nanopowder was prepared by simple sonochemical method. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, optical absorption (UV-Vis), photoluminescence (PL), Electron Paramagnetic Resonance (EPR), Fourier transform infrared (FT-IR) spectroscopy and magnetization have been used to characterize the sample. XRD study revealed that Mn 2? doped ZnO had wurtzite hexagonal structure. Composition analysis by EDX indicated the presence of small amounts of manganese. Crystal field (Dq) and interelectronic repulsion (B, C) parameters are evaluated from optical absorption. SpinHamiltonian and bonding parameters are evaluated from the EPR study. Optical and EPR confirms that the Mn 2? entered into ZnO lattice as distorted octahedral site symmetry. FT-IR spectrum exhibited vibrational bands of Zn-O bonds. PL spectrum shows the emission bands in UV and visible region. Magnetization loop was measured and clearly shows typical ferromagnetic saturation behavior. The results suggest oxygen vacancies, especially singly ionized oxygen vacancies, play a crucial role in mediating ferromagnetism in the Mn doped ZnO system.

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“…Raman spectra was obtained for irradiated samples in order to study the formation of defect centers in the samples. The reports of various groups [36][37][38][39] predicts that there is a spectral shift in the Raman peaks and also distortions are observed when the samples are undergone ir-radiation treatment. For Mnx Zn1-x O (x = 0.03, 0.05) films consider-able changes are observed upon irradiation.…”

Section: Electron Beam Induced Effects Investigated By Raman Spectrosmentioning

confidence: 99%

Methodical engineering of defects in MnXZn1-X O(x = 0.03, and 0.05) nanostructures by electron beam for nonlinear optical applications: A new insight

Antony

Poornesh

Kityk

et al. 2019

Ceramics International

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A series of MnxZn1-xO (x = 0.03, 0.05) nanostructures have been grown via the solution based chemical spray pyrolysis technique. Electron beam induced modifications on structural, linear and nonlinear optical and surface morphological properties have been studied and elaborated. GXRD (glancing angle X-ray diffraction) patterns show sharp diffraction peaks matching with the hexagonal wurtzite structure of ZnO thin films. The upsurge in e-beam dosage resulted in the shifting of XRD peaks (101) and (002) towards lower angle side, and increase in FWHM value. Gaussian deconvolution on PL spectra reveals the quenching of defect centers, implying the role of electron beam irradiation regulating luminescence and defect centers in the nanostructures. Irradiation induced spatial confinement and phonon localization effects have been observed in the films via micro Raman studies. The later are evident from spectral peak shifts and broadening. Detailed investigations on the effect of electron beam irradiation on third order nonlinear optical properties under continuous and pulsed mode of laser op-eration regimes are deliberated. Third order absorptive nonlinearity of the nanostructures evaluated using the open aperture Z-scan technique in both continuous and pulsed laser regimes shows strong nonlinear absorption coefficient βeff of the order 10 -4 cm/W confirming their suitability for passive optical limiting applications under intense radiation environments. Laser induced third harmonic generation (LITHG) experiment results supports the significant variation in nonlinearities upon electron beam irradiation, and the effect can be utilized for frequency conversion mechanisms in high power laser sources and UV light emitters.

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Structural, luminescence and magnetic properties of Mn doped ZnO thin films using spin coating technique

Cited by 21 publications

References 31 publications

X-ray absorption spectroscopy of Mn doped ZnO thin films prepared by rf sputtering technique

X-ray absorption spectroscopy of Mn doped ZnO thin films prepared by rf sputtering technique

A simple sonochemical approach of Mn2+ doped ZnO nanopowder: structural, optical and magnetic studies

Methodical engineering of defects in MnXZn1-X O(x = 0.03, and 0.05) nanostructures by electron beam for nonlinear optical applications: A new insight

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