Structural, electronic, morphological, optical and magnetic properties of Mn0.03–xCoxZn0.97O (0 ≤ x ≤ 0.03) nanoparticles

Ahmed, Md. A.; Yadav, Ashok K.; Banerjee, Aritra; Bandyopadhyay, S.

doi:10.1007/s10854-016-5747-z

Cited by 5 publications

(3 citation statements)

References 52 publications

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“…Nanostructured thin films of TM:ZnO synthesized by sol‐gel technique with annealing temperature of 500 °C exhibited strong FM . However, TM:ZnO nanoparticles synthesized by sol‐gel technique and annealed at the same temperature (500 °C) did not show any FM . On the other hand, TM:ZnO nanoparticles synthesized by the solid state reaction method with annealing temperature of 500 °C showed intrinsic FM .…”

Section: Introductionmentioning

confidence: 96%

“…Despite the success of generating intrinsic FM in TM:ZnO systems, the solid state reaction technique is not so versatile as compared to the sol‐gel technique because of its poor reproducing capability of nanoparticles in homogeneous form. Under such conditions, reducing annealing temperature from 500 °C to 350 °C, intrinsic FM in Mn and Co doped ZnO nanoparticles has been reported and it seems to be quite interesting for further study.…”

Section: Introductionmentioning

confidence: 97%

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The Magnetic Properties of Sol-Gel Synthesized TM_0.03 Zn_0.97 O (TM: Mn, Fe, Co and Ni) Nanoparticles: Role of Different Transition Metals

et al. 2017

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TM 0.03 Zn 0.97 O (TM: Mn, Fe, Co and Ni) nanoparticles have been synthesized using sol-gel technique. Structural study through X-ray diffraction (XRD) has revealed that all samples, except Ni:ZnO, possess single phase wurtzite structure of ZnO, whereas in Ni:ZnO, Ni ions have mainly segregated as NiO (a secondary phase). Morphological study through Field Effect Scanning Electron Microscopy (FESEM) has confirmed the formation of nanoparticles with particle sizes in the range of 30-61 nm. X-ray absorption spectroscopy (XAS) exhibits that Co ions substitutionally replace Zn ions, Mn ions partially occupy substitutional sites and partially interstitial positions, Fe ions mainly occupy interstitial positions, whereas Ni ions mainly chemically segregate with oxygen to form NiO phase. All TM:ZnO samples show reasonable ferromagnetism (FM) up to room temperature (RT) and except for the Ni:ZnO, the observed FM seems to be intrinsic in nature. Temperature dependent magnetization (MÀT) measurement of Ni:ZnO reveals a superparamagnetic behavior (with transition temperature higher than 300 K). In the regime of diluted magnetic semiconductors (DMSs) and as far as intrinsic FM is concerned, Fe:ZnO sample seems to be a good ferromagnet with appreciable saturation magnetization (M S ),whereas Co:ZnO shows hard FM (with significant irreversible magnetization). The higher capability of occupying substitutional position by Co ions enhances further the utility of Co:ZnO.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 97%

The Magnetic Properties of Sol-Gel Synthesized TM_0.03 Zn_0.97 O (TM: Mn, Fe, Co and Ni) Nanoparticles: Role of Different Transition Metals

et al. 2017

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“…Such investigation can effectively be performed by thorough local structure study by XANES. [12][13][14] The report 12 of XANES for TM doped ZnO exhibits that the efficiency of substitutional occupation is appreciably high in Co doping, moderate in Mn doping, low in Fe doping and secondary oxide phase segregation occurs for Ni doping when maximum doping concentration is quite low (below 3 at%).…”

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confidence: 99%

Removal of Ferrimagnetic ZnFe₂O₄ Impurity Phase by Li Co-Doping in Fe Doped ZnO

Ahmed¹,

Bandyopadhyay

Banerjee

2021

ECS J. Solid State Sci. Technol.

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A simple approach is presented to remove the impurity phase of ZnFe2O4 from Fe doped ZnO. Gradual incorporation of non-magnetic Li ions reduced 5.6% phase contamination of ZnFe2O4 to negligible limit (<0.01%) from 4 at% (atomic %) Fe doped ZnO. X-ray absorption near edge spectroscopy (XANES) revealed that the most of the Fe ions were in Fe3+ state. The optical absorption spectra of Fe doped ZnO samples exhibited d-d transition between Fe ions. It also indicated the signature of ZnFe2O4 phase, which reduced gradually on Li increment. ZnFe2O4 contained samples exhibited strong magnetic ordering with spin-glass character at low temperature and weak ferromagnetism (FM) at the room temperature with disordered inverse spinel structure. However, 6 at% Li incorporated sample did not show any significant FM in the entire temperature range of 2–300 K. ZnFe2O4 is supposed to be the possible source of the observed strong magnetic ordering i.e., FM has extrinsic origin. The gradual removal of impurity phase ZnFe2O4 by increasing Li doping without damaging any intrinsic property of Fe doped ZnO is primarily due to gradual increase of tetrahedral coordination of Fe ions.

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WCl3 monolayer: a first principles prediction of electronic and magnetic properties under an external electric field

Ahmed,

Safi

2024

J Comput Electron

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Structural, electronic, morphological, optical and magnetic properties of Mn0.03–xCoxZn0.97O (0 ≤ x ≤ 0.03) nanoparticles

Cited by 5 publications

References 52 publications

The Magnetic Properties of Sol-Gel Synthesized TM_0.03 Zn_0.97 O (TM: Mn, Fe, Co and Ni) Nanoparticles: Role of Different Transition Metals

The Magnetic Properties of Sol-Gel Synthesized TM_0.03 Zn_0.97 O (TM: Mn, Fe, Co and Ni) Nanoparticles: Role of Different Transition Metals

Removal of Ferrimagnetic ZnFe₂O₄ Impurity Phase by Li Co-Doping in Fe Doped ZnO

WCl3 monolayer: a first principles prediction of electronic and magnetic properties under an external electric field

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Structural, electronic, morphological, optical and magnetic properties of Mn0.03–xCoxZn0.97O (0 ≤ x ≤ 0.03) nanoparticles

Cited by 5 publications

References 52 publications

The Magnetic Properties of Sol-Gel Synthesized TM0.03 Zn0.97 O (TM: Mn, Fe, Co and Ni) Nanoparticles: Role of Different Transition Metals

The Magnetic Properties of Sol-Gel Synthesized TM0.03 Zn0.97 O (TM: Mn, Fe, Co and Ni) Nanoparticles: Role of Different Transition Metals

Removal of Ferrimagnetic ZnFe2O4 Impurity Phase by Li Co-Doping in Fe Doped ZnO

WCl3 monolayer: a first principles prediction of electronic and magnetic properties under an external electric field

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Product

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The Magnetic Properties of Sol-Gel Synthesized TM_0.03 Zn_0.97 O (TM: Mn, Fe, Co and Ni) Nanoparticles: Role of Different Transition Metals

The Magnetic Properties of Sol-Gel Synthesized TM_0.03 Zn_0.97 O (TM: Mn, Fe, Co and Ni) Nanoparticles: Role of Different Transition Metals

Removal of Ferrimagnetic ZnFe₂O₄ Impurity Phase by Li Co-Doping in Fe Doped ZnO