Electronic and magnetic properties of Co-doped ZnO diluted magnetic semiconductor

Singhal, R. K.; Samariya, Arvind; Xing, Yutao; Kumar, Sudhish; Dolia, S. N.; Deshpande, Uday; Shripathi, T.; Baggio-Saitovitch, E.

doi:10.1016/j.jallcom.2010.02.005

Cited by 98 publications

(44 citation statements)

References 50 publications

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“…Polycrystalline samples of ZnO and In 2 O 3 with Co 3 O 4 are blended, respectively, by the typical solid-state reaction route [30,31]. All the compounds used are 99.9% pure.…”

Section: Methodsmentioning

confidence: 99%

Study of the hydrogenation and re-heating of Co-doped ZnO and In2O3 Nano composites

Mukherji

Mathur

Samariya

et al. 2018

Adv Compos Hybrid Mater

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Nanocomposite samples of zinc oxide (ZnO) and indium oxide (In 2 O 3 ) doped with Co (at 1.5% molar concentration) are synthesized through conventional solid-state reaction technique. These samples are taken in a quartz tube and placed in reduction furnace for post-annealing in the presence of hydrogen for~10 h at around 550°C. The X-ray diffraction (XRD) study confirms the formation of hexagonal wurtzite structure for ZnO, Zn H exhibited a perceptible ferromagnetic behavior at 300 K whereas it overturns significantly after long air sintering. An effort has been made to fit the experiential M-H data of hydrogenated samples to the Bound Magnetic Polaron (BMP) model. MATLAB-based simulations have been performed to validate the homogeneity in particle distribution of the samples evinced through SEM micrographs. A multivariate assessment viz. hierarchical cluster analysis is also executed to corroborate and strengthen the experimental findings of magnetic properties.

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“…Polycrystalline samples of ZnO and In 2 O 3 with Co 3 O 4 are blended, respectively, by the typical solid-state reaction route [30,31]. All the compounds used are 99.9% pure.…”

Section: Methodsmentioning

confidence: 99%

Study of the hydrogenation and re-heating of Co-doped ZnO and In2O3 Nano composites

Mukherji

Mathur

Samariya

et al. 2018

Adv Compos Hybrid Mater

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“…Though, the origin of ferromagnetism (FM) is still controversial and numerous exchange mechanisms have been offered to interpret the origin of magnetism. These mechanisms include Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions, bound magnetic polaron models (BMPs), as well as carrier-mediated and charge transfer FMs [30][31][32][33][34][35]. At present, only few investigations reported on of Co-doped In 2 O 3 nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

“…The refinement results ratify that Co 2+ ions substitute the In 3+ site and the hydrogenation or long re-heating of the hydrogenated sample did not cause any structural change. A slight cell volume contraction is observed on Co doping (V= 1035.4 Å3 for pure In 2 O 3 and V= 1029.5 Å3 for 6% Co doped sample), due to a minor difference in ionic radii of the dopant and the host ions (Co 2+ :0.745Å and In 3+ :0.80 Å) [31,32]. Interestingly, upon re-heating of the hydrogenated samples (for 7 or more h) the oxygen contents re-acquire their as-prepared values.…”

Section: Introductionmentioning

confidence: 99%

Study of the Hydrogenation and Re-heating of Co-doped In<sub>2</sub>O<sub>3</sub> based Diluted Magnetic Semiconductors

Mukherji¹,

Mathur²,

Samariya³

et al. 2017

JAN

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Abstract. In this work, the Co 2+ ions doping effect on the magnetic behaviour of In 2 O 3 nanoparticles (NPs) has been discussed. The In 0.94 Co 0.06 O sample was prepared by solid state reaction method. According to XRD, the single crystalline phase was identified as the cubic bixbyite crystal structure and doping effect of prepared NPs. The magnetic study at room temperature (RT) revealed that the prepared Co doped In 2 O 3 sample had achieved overlapped paramagnetic (PM) properties defeating the diamagnetic (DM) properties of In 2 O 3 . Furthermore, it was found that the ferromagnetic (FM) is clearly induced by post-annealing in hydrogen atmosphere at 50 and 300 K. This study also depicts that the sample is finally returned to the PM state after re-heating.

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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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Electronic and magnetic properties of Co-doped ZnO diluted magnetic semiconductor

Cited by 98 publications

References 50 publications

Study of the hydrogenation and re-heating of Co-doped ZnO and In2O3 Nano composites

Study of the hydrogenation and re-heating of Co-doped ZnO and In2O3 Nano composites

Study of the Hydrogenation and Re-heating of Co-doped In<sub>2</sub>O<sub>3</sub> based Diluted Magnetic Semiconductors

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

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