Diluted magnetic semiconducting properties of nanocrystalline Zn0.98X0.02O (X = Fe, Ga, Ni) thin films deposited by PLD technique for spintronic applications

Singh, K. B.; Rawal, Ishpal; Gautam, Prikshit; Sharma, Nonita; Dhar, Rakesh

doi:10.1016/j.jmmm.2018.08.024

Cited by 20 publications

(11 citation statements)

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“…But this technique can be equally applicable to the other oxide materials having different kinds of defect states and distribution of grains and grain boundaries. According to this technique an oxide materials can be ferromagnetic if the value of grain boundary specific area is higher than a critical value . The observed value of Sa for the present MnO 2 samples is found to 4.37x10 7 m 2 m −3 , which is quite higher than the critical value for iron doped ZnO nanocrystals (3×10 4 m 2 m −3 ) established by Straumal et al .…”

Section: Resultsmentioning

confidence: 41%

“…Moreover, extra peaks are not observed related to the impurity phases such as α, γ, and δ‐MnO 2 . The crystallite size of the MnO 2 particles have been calculated from the sharp reflection (110) using well known Scherrer's formula,

true Δ = \frac{0.91 λ}{β normalc normalo normals θ}

…”

Section: Resultsmentioning

confidence: 99%

“…The magnetic properties of the pristine β‐MnO 2 and composites of MnO 2 with PANI (S3 and S4) have been investigated at room temperature (∼290 K) in the range of −5000 to 5000 Oe of applied magnetic field (Figure (d)). Magnetic properties of pristine MnO 2 nanocrystallites depend upon the concentration of magnetic ions, their distribution at different tetrahedral and octahedral sites, and concentration of defect states . The hysteresis curve of pristine MnO 2 nanocrystallites reveals the ferromagnetic nature in the applied range of magnetic field (−5000 to 5000 Oe).…”

Section: Resultsmentioning

confidence: 99%

“…introduced a technique of grain boundary specific area calculation (Sa). The grain boundary specific area (Sa) is defined as the ratio of the area of grain boundary to the grain volume and can be expressed as

true S_{a} = \frac{1.65}{Δ}

…”

Section: Resultsmentioning

confidence: 99%

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MnO₂‐Magnetic Core‐Shell Structured Polyaniline Dependent Enhanced EMI Shielding Effectiveness: A Study of VRH Conduction

et al. 2019

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The core-shell structured based Polyaniline/MnO 2 composites were synthesized by chemical oxidation method, wherein MnO 2 particles acts as a magnetic core while polyaniline chains wrapped over these particles acts as a shell. Four different loading concentrations of MnO 2 particles (10, 20, 30 and 40 wt %) were used to investigate the effect of MnO 2 concentration on the EMI shielding effectiveness. X-ray diffraction (XRD) studies performed on pristine MnO 2 and composite samples reveal the polycrystalline nature of the MnO 2 particles and semi-crystalline nature of the composites with a sharp peak around 25°over a broad hump. Vibrating sample magnetometry (VSM) studies performed on the pristine MnO 2 particles as well composite sample (S4) at higher loading (40 wt %) concentration of MnO 2 suggest the ferromagnetic nature at room temperature. The charge transport properties of the prepared samples have been investigated under variable range hopping (VRH) conduction. Mott's three dimensional VRH model has been found to be applicable for conduction in the present samples. The dc conductivity of the prepared samples is found to increase with MnO 2 loading concentrations, which suggest their possible validity for EMI shielding applications. Therefore, the prepared samples are analyzed for EMI shielding properties in the frequency range of 8.2 to 12.4 GHz (X-band). The sample prepared with 30 wt% of MnO 2 has as much as 50 dB shielding effectiveness, which is quite higher than that required for industrial application (∼ 30dB).[a] R. Pal, Prof.

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Section: Resultsmentioning

confidence: 41%

true Δ = \frac{0.91 λ}{β normalc normalo normals θ}

…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

true S_{a} = \frac{1.65}{Δ}

…”

Section: Resultsmentioning

confidence: 99%

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MnO₂‐Magnetic Core‐Shell Structured Polyaniline Dependent Enhanced EMI Shielding Effectiveness: A Study of VRH Conduction

et al. 2019

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“…Therefore, these structural parameters have been evaluated for all three sets of films. The well known Debye-Scherrer's formula [18][19][20][21] given below is used to determine the crystallite size,…”

Section: Structural and Morphological Studiesmentioning

confidence: 99%

Fabrication of n-ZnO/p-Si++ Hetero-junction Devices for Hydrogen Detection: Effect of Annealing Temperature

Kumar

Rawal

Kumar

2021

Preprint

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In the present study, we reports the fabrication of n-ZnO/p-Si++ hetero-junction devices for the detection of hydrogen leakage in ambient air environment. For the fabrication of n-ZnO/p-Si++ hetero-junction devices, high quality ZnO thin films are grown by controlled thermal evaporation technique on the highly doped p-type silicon substrates at 400 oC. The two sets of films deposited at 400 o C are further annealed at 500 and 600 oC to examine the effect of annealing temperature on the structural, morphology, electrical and gas sensing properties of the deposited films. It is revealed from the x-ray diffraction studies that the crystallite size, and the density of the films increase from 22.55 to 24.95 nm, from 5.65 to 5.68 g/cm3, respectively, on increasing the fabrication temperature from 400 to 600 oC. In contrast to it, the grain boundary specific surface area decrease from 8.79 x107 to 7.88 x107 m-1 on changing the fabrication temperature from 400 to 600 oC. The hydrogen gas sensing response of the fabricated devices has also been recorded at different operating temperatures and different hydrogen concentrations (200 to 1000ppm) in air ambient. It is found that the gas sensing response of the fabricated devices increase with increase in operating temperature (up to 100 oC) and decease beyond this temperature. The gas sensing responses of the devices fabricated at 400, 500 and 600 oC are found to be 97.22, 64.23 and 40.77 % at 1000 ppm of hydrogen. A decrease in gas sensing response with fabrication temperature is attributed to the increase in crystallite size (quantum size effect), density of films (i.e. lower penetration) and decrease in grain boundary specific surface area (i.e. active sites) with annealing temperature. The mechanism of the gas sensing in these devices has also been systematically analyzed under different models.

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Structural, magnetic, and optical properties of degenerated Ni and (Ga/Zn) co-doped TiO2 nanocomposites

Dakhel

2020

Appl. Phys. A

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Diluted magnetic semiconducting properties of nanocrystalline Zn0.98X0.02O (X = Fe, Ga, Ni) thin films deposited by PLD technique for spintronic applications

Cited by 20 publications

References 59 publications

MnO₂‐Magnetic Core‐Shell Structured Polyaniline Dependent Enhanced EMI Shielding Effectiveness: A Study of VRH Conduction

MnO₂‐Magnetic Core‐Shell Structured Polyaniline Dependent Enhanced EMI Shielding Effectiveness: A Study of VRH Conduction

Fabrication of n-ZnO/p-Si++ Hetero-junction Devices for Hydrogen Detection: Effect of Annealing Temperature

Structural, magnetic, and optical properties of degenerated Ni and (Ga/Zn) co-doped TiO2 nanocomposites

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Diluted magnetic semiconducting properties of nanocrystalline Zn0.98X0.02O (X = Fe, Ga, Ni) thin films deposited by PLD technique for spintronic applications

Cited by 20 publications

References 59 publications

MnO2‐Magnetic Core‐Shell Structured Polyaniline Dependent Enhanced EMI Shielding Effectiveness: A Study of VRH Conduction

MnO2‐Magnetic Core‐Shell Structured Polyaniline Dependent Enhanced EMI Shielding Effectiveness: A Study of VRH Conduction

Fabrication of n-ZnO/p-Si++ Hetero-junction Devices for Hydrogen Detection: Effect of Annealing Temperature

Structural, magnetic, and optical properties of degenerated Ni and (Ga/Zn) co-doped TiO2 nanocomposites

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Product

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Diluted magnetic semiconducting properties of nanocrystalline Zn0.98X0.02O (X = Fe, Ga, Ni) thin films deposited by PLD technique for spintronic applications

MnO₂‐Magnetic Core‐Shell Structured Polyaniline Dependent Enhanced EMI Shielding Effectiveness: A Study of VRH Conduction

MnO₂‐Magnetic Core‐Shell Structured Polyaniline Dependent Enhanced EMI Shielding Effectiveness: A Study of VRH Conduction