Room temperature ferromagnetism in Mn-doped zinc oxide nanorods prepared by hybrid wet chemical route

Sharma, Manoj Kumar; Gayen, R.N.; Pal, A.K.; Kanjilal, D.; Chatterjee, Ratnamala

doi:10.1016/j.jallcom.2011.04.034

Cited by 25 publications

(11 citation statements)

References 45 publications

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“…May be there are also some isolated Mn atoms which are paramagnetic in nature and that increases the paramagnetic contribution for increasing concentration. Similar behavior and magnetization values for Mn-doped ZnO for comparable concentration have been reported in the literature [32,34,35]. On the other hand, the coercive field decreases with increasing concentration (Fig.…”

Section: Resultssupporting

confidence: 88%

Sol–gel synthesis and room temperature ferromagnetism in Mn doped ZnO nanocrystals

Omri

Lemine

Ghoul

et al. 2015

J Mater Sci: Mater Electron

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We report the synthesis of Zn 1-x Mn x O nanoparticles prepared by a sol-gel processing technique for x ranging from 0 to 0.05. The structural, morphological and magnetic properties of the nanoparticles were investigated by XRD, transmission electron microscopy and superconducting quantum interference device. The structural properties showed that the obtained nanoparticles are in wurtzite phase structure with the presence of ZnMnO 3 secondary phase at higher concentration. The crystallite size decreases with increasing Mn concentration and is in the range of 35-17 nm. All the samples are ferromagnetic with clear hysteresis loop at room temperature but with low values for the saturation. It was found that increasing Mn concentration is not helping the long range ferromagnetic order, which might be due to the antiferromagnetic exchanges. This ferromagnetism order is due mainly to the defects and to the substituting of Mn in the ZnO host rather than from the secondary phases of Mn.

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Section: Resultssupporting

confidence: 88%

Sol–gel synthesis and room temperature ferromagnetism in Mn doped ZnO nanocrystals

Omri

Lemine

Ghoul

et al. 2015

J Mater Sci: Mater Electron

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“…Specially, among all the TMs, the doping of Mn in ZnO is most encouraging because the ionic radius of Mn 2+ is similar to Zn 2+ and the substitutional Mn 2+ has the highest magnetic moment. However, in the case of Mn doped ZnO, although a few researchers obtained RT ferromagnetism in this material [6][7][8][9], the origin of the observed ferromagnetism still remains a controversy, whether it comes from manganese oxide, precipitation of secondary phase, or the replacement of Zn 2+ by Mn 2+ in the ZnO host lattice. Also, the ferromagnetic coupling in ZnO:TM is very sensitive to sample preparation, crystalline quality, residual defects, and resulting carrier concentrations [9].…”

Section: Introductionmentioning

confidence: 99%

“…might be ferromagnetic with Curie temperature (T C ) above room temperature (RT) [2,3], ZnO-based diluted magnetic semiconductors (DMSs) are attracting much more attention. This has led to a large number of experimental [4][5][6][7][8][9][10] and theoretical [11,12] studies of TM-doped ZnO. Specially, among all the TMs, the doping of Mn in ZnO is most encouraging because the ionic radius of Mn 2+ is similar to Zn 2+ and the substitutional Mn 2+ has the highest magnetic moment.…”

Section: Introductionmentioning

confidence: 99%

Raman scattering and electrical properties of Zn1−xMnxO films

Ruan

Fang

Qin

et al. 2012

Journal of Alloys and Compounds

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“…The observed peak with binding energy of Mn nearly at ∼ 640.8 eV, may be associated with Mn-2p 3/2 , indicating the presence of bivalent Mn ions in the samples. 20,36 Moreover, the binding energy of Mn-2p 3/2 for Mn-doped ZnO nanorods shifts to the low-energy side compared to that of the commercial MnO powders. This is possibly related to the incorporation of Mn 2+ ions into the lattice position of Zn in ZnO.…”

Section: Chemical Propertiesmentioning

confidence: 99%

“…Mn doped ZnO nanostructures are very useful for potential spintronics applications. [17][18][19][20] One dimensional (1-D) ZnO nanostructures are widely used due to their unique structural properties and possible quantum confinement effects in two dimensions with large specific area. There are different kinds of 1-D nanostructures such as, nanowires, nanobelts, nanorods etc.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and optical properties of Mn-doped ZnO vertically aligned nanorods synthesized by hydrothermal technique

2016

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In this paper we have reported the synthesis of high quality vertically aligned undoped and Mn-doped ZnO single crystalline nanorods arrays on Si (100) substrates using two steps process, namely, initial slow seed layer formation followed by solution growth employing wet chemical hydrothermal method. The shapes of the as grown single crystalline nanorods are hexagonal. The diameter and length of the as grown undoped ZnO nanorods varies in the range of 80-150 nm and 1.0 - 1.4 μm, respectively. Along with the lattice parameters of the hexagonal crystal structure, the diameter and length of Mn doped ZnO nanorods are found to increase slightly as compared to the undoped ZnO nanorods. The X-ray photoelectron spectroscopy confirms the presence of Mn atoms in Mn2+ state in the single crystalline ZnO nanorods. The recorded photoluminescence spectrum contains two emissions peaks having UV exciton emissions along with a green-yellow emission. The green-yellow emissions provide the evidence of singly ionized oxygen vacancies. The magnetic field dependent magnetization measurements [M (H)] and zero field cooled (ZFC) and field cooled (FC) magnetization [M(T)] measurements have been carried out at different isothermal conditions in the temperature range of 5-300 K. The Mn doped ZnO nanorods clearly show room temperature ferromagnetic ordering near room temperature down to 5 K. The observed magnetization may be attributed to the long range ferromagnetic interaction between bound magnetic polarons led by singly charged oxygen vacancies.

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Room temperature ferromagnetism in Mn-doped zinc oxide nanorods prepared by hybrid wet chemical route

Cited by 25 publications

References 45 publications

Sol–gel synthesis and room temperature ferromagnetism in Mn doped ZnO nanocrystals

Sol–gel synthesis and room temperature ferromagnetism in Mn doped ZnO nanocrystals

Raman scattering and electrical properties of Zn1−xMnxO films

Magnetic and optical properties of Mn-doped ZnO vertically aligned nanorods synthesized by hydrothermal technique

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