Structural, electrical and magnetic properties of Co and Fe co-doped ZnO nanoparticles prepared by solution combustion method

Dinesha, M.L.; Jayanna, H. S.; Mohanty, Shalini; Ravi, S.

doi:10.1016/j.jallcom.2009.10.120

Cited by 98 publications

(38 citation statements)

References 43 publications

(35 reference statements)

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“…The EDX images depict the presence of Fe, Co and Zn atoms in the prepared samples. No traces of other elements were found in the spectra confirms the purity of the samples [19,20,27]. The elemental composition of the constituent ions in atomic weight percentage is given in Table 2.…”

Section: Sem Measurementsmentioning

confidence: 55%

“…And hence the observed strong ferromagnetism cannot be attributed to CoO. Ferromagnetism is assumed to be caused by oxygen and/or zinc vacancies and transition metal (TM) ions doping, but for undoped DMS materials the ferromagnetism is found to be caused from oxygen and/or zinc vacancies without TM dopant [18][19][20][25][26][27]. The saturation magnetization of the samples increases with the increase in Fe dopant ratio and it increases from 0.48 emu/g to 10.93 emu/g at x=0.2.…”

Section: Magnetization Measurementsmentioning

confidence: 99%

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Rapid synthesis of room temperature ferromagnetic Fe and Co co-doped ZnO DMS nanoparticles

Köseoğlu

2015

Ceramics International

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Section: Sem Measurementsmentioning

confidence: 55%

Section: Magnetization Measurementsmentioning

confidence: 99%

Rapid synthesis of room temperature ferromagnetic Fe and Co co-doped ZnO DMS nanoparticles

Köseoğlu

2015

Ceramics International

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“…The transition metals (TM= Ni, Cr, Mn, Fe, Co and Cu) doped ZnO is an exceptional diluted magnetic semiconductors (DMSs) in which the degree of freedom corresponding to spin is added to the charge and it is very attractive nanomaterials used in various electrical, optical and magnetic applications and are believed to be ideal semiconductor RESEARCH ARTICLE materials for spintronics. DMSs are non-magnetic semiconductors in which a fraction of host cations are replaced by magnetic ions 3,4 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Dopant Concentration on Structural, Optical and Magnetic Properties of Zn1-xNixO Nanocomposites

2018

Chem Sci Trans

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Zn 1-x Ni x O (x=0.0, 0.2, 0.4, 0.6) nanocomposites were synthesized by co-precipitation method and further annealed at 400 o C. Characterization of nanocomposites was carried out by x-ray diffraction (XRD), Fourier transform infra-red spectrometer (FTIR), UV-Visible spectroscopic, vibrating sample magnetometer (VSM) and transmission electron microscope (TEM) techniques. The structural study confirms that nickel (II) ions replace Zn 2+ ions in the ZnO lattice without changing its Wurtzite structure and secondary phase (NiO) was observed with the increase in nickel concentration (x≥0.4). The presence of various functional groups and M-M and M-O chemical bonding were confirmed by FTIR. The optical properties of ZnO nanocrystallities with Ni-doping was investigated by UV-Vis absorption spectra which indicates red shift in the absorption band on Ni-doping. The morphology and structural information were obtained by the TEM images which shows hexagonal nanoparticles with average particle size of 15-50 nm. The change in magnetic behavior of ZnO nanoparticles with varying Ni 2+ doping concentration was investigated by VSM.

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“…Dietl et al [4] and Sato et al [5] predicted that, the transition metal ions doped ZnO are the promising candidates for spintronics applications with intrinsic DMS properties at RT. In this context transition metal doped ZnO DMS's are being extensively studied in the form of both nanoparticles [6][7][8][9][10] and thin films [11][12][13][14][15][16][17] by various research groups. Co doped ZnO based DMS materials are of great interest, due to the tunability of FM above RT, high solubility limit and large magnetic moment per 'Co' ion.…”

Section: Introductionmentioning

confidence: 99%

“…Theoretical calculations by Sako and Katayama-Yoshida [5], have predicted that intrinsic FM of Co doped ZnO can be achieved by electrondoping, when magnetic dopants substituted at 'Zn' cation sites. There are few reports with experimental results on Co doped ZnO with DMS properties [6][7][8][9][10][11][12][13][14][15][16][17]. But the possibilities of extrinsic FM have not been ruled out, in fact it has been observed in Co doped ZnO [18][19][20][21], due to the formation of metallic Co impurity, Co 3 O 4 phases and oxygen vacancies.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic investigation of an intrinsic room temperature ferromagnetism in Co doped ZnO nanoparticles

Srinatha

Angadi

Nair

et al. 2014

Journal of Electron Spectroscopy and Related Phenomena

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a b s t r a c tPure and Co substituted ZnO nano crystalline particles were prepared by solution combustion technique using l-Valine as a fuel. As synthesized powder samples were characterized by X-ray diffractometer and SQUID magnetometer to confirm the formation of single phase wurtzite structure and to study the bulk magnetic response of the sample, respectively. Magnetic studies show that Co doped ZnO nanoparticles exhibit ferromagnetism (FM) at room temperature (RT). Furthermore, the electronic structure and element specific magnetic properties were investigated by near-edge X-ray absorption fine structure (NEXAFS) and X-ray magnetic circular dichroism (XMCD) measurements, respectively. The effect of Co substitution on the spectral features of Co-ZnO at O K-edge, Co L 3,2 edge, Zn L 3,2 edge have been investigated. The spectral features of NEXAFS at Co L 3,2 edge is entirely different from the spectral features of metallic clusters and other impurity phases, which rules out the presence of impurity phases. The valence state of 'Co' ion is found to be in +2 state. The FM nature of the sample was confirmed through XMCD spectra, which is due to the incorporation of divalent 'Co' ions. Hence the presented results confirm the substitution of 'Co' ions at 'Zn' site in the host lattice, which is responsible for the RTFM.

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Structural, electrical and magnetic properties of Co and Fe co-doped ZnO nanoparticles prepared by solution combustion method

Cited by 98 publications

References 43 publications

Rapid synthesis of room temperature ferromagnetic Fe and Co co-doped ZnO DMS nanoparticles

Rapid synthesis of room temperature ferromagnetic Fe and Co co-doped ZnO DMS nanoparticles

Effect of Dopant Concentration on Structural, Optical and Magnetic Properties of Zn1-xNixO Nanocomposites

Spectroscopic investigation of an intrinsic room temperature ferromagnetism in Co doped ZnO nanoparticles

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