Effect of size reduction on the electronic and ferromagnetic properties of the In2O3 nanoparticles

Naeem, Muhammad; Qaseem, S.; Ahmad, Iftikhar; Maqbool, Muhammad

doi:10.1007/s11051-012-0808-6

Cited by 16 publications

(8 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hence, the NPs are either nonmagnetic or weakly ferromagnetic with saturated magnetization of no more than 10 −4 emu g −1 . This is consistent with the saturated magnetization of In 2 O 3 NPs reported previously . The irregular surface cannot provide enough free space for itinerant electrons to move.…”

Section: Resultssupporting

confidence: 92%

See 1 more Smart Citation

Enhancement of Ferromagnetism in Nonmagnetic Metal Oxide Nanoparticles by Facet Engineering

Long

Xiong

Meng

et al. 2016

Small

View full text Add to dashboard Cite

Ferromagnetism in semiconducting metal oxide nanoparticles has been intensively investigated due to their potential applications in spintronics, information storage, and biomedicine. Ferromagnetism can be produced in nonmagnetic metal oxide nanoparticles by a variety of methods or factors, but the saturated magnetization is typically of the order of 10 emu g and too small to be useful in practice. In this work, it is demonstrated theoretically and experimentally that stronger ferromagnetism can be achieved in undoped nonmagnetic metal oxide semiconductors by exposing some specific polar crystal facets with carvings of special bonds via the interaction with underlying vacancies. In O microcubes with completely enclosed {001} polar facets show two orders of magnitude enhancement at room temperature compared to nanoparticles with an irregular morphology. The surface magnetic domains on the {001} facets account for the significantly enhanced ferromagnetism. The technique and concept described here can be extended to other types of metal oxide nanostructures to spur their application to spintronics.

show abstract

Section: Resultssupporting

confidence: 92%

“…It has been reported that undoped metal oxide NPs exhibit room temperature FM due to surface oxygen vacancies (OVs), but the saturated magnetization is too small to be practical in spintronics applications. Hence, it is important to find new approaches to enhance the FM of pure metal oxides.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Ferromagnetism in Nonmagnetic Metal Oxide Nanoparticles by Facet Engineering

Long

Xiong

Meng

et al. 2016

Small

View full text Add to dashboard Cite

show abstract

“…High temperature annealing both increased the particle size and destroyed the room temperature FM [4]. Other authors have noted this inverse correlation between nanoparticle size and the presence of FM [2]. One speculates that room temperature FM is due to oxygen vacancies or other surface defects.…”

Section: Introductionmentioning

confidence: 91%

“…Many groups have observed ferromagnetic (FM) signals at room temperature in nanoparticle oxide samples [1,2,3] and several mechanisms for the FM including uncompensated surface spins and oxygen vacancies have been suggested. In a highly cited paper, Sundaresan et al observed room temperature FM in several different oxide systems (CeO 2 , Al 2 O 3 , ZnO, In 2 O 3 and SnO 2 ) for samples in which the average nanoparticle diameter was less than approximately 30 nm.…”

Section: Introductionmentioning

confidence: 99%

A study of ferromagnetic signals in SrTiO3 nanoparticles

Kovacs¹,

Roches²,

Crandles³

2014

AIP Conference Proceedings

View full text Add to dashboard Cite

“…For the film N7, O I peak at 529.49 eV can be assigned to the oxygen (O 2-) anion in In 2 O 3 or Nb-oxides [46]. Naeem et al [47] attributed the high binding energy peak at 531.6 eV to O 2ions in the oxygen deficient region. Luhin et al [48] assigned the photoelectron line with a binding energy 531.9 eV to the surface adsorbed oxygen in various forms as well as to the oxygen incorporated in a hydroxyl group.…”

Section: Xps Analysismentioning

confidence: 99%

Effect of Nb doping on the structural, morphological, optical and electrical properties of RF magnetron sputtered In₂O₃ nanostructured films

Krishnan

Chalana

Sagadevan

et al. 2016

Phys. Status Solidi C

View full text Add to dashboard Cite

Undoped and niobium (Nb) doped indium oxide (In2O3) thin films are prepared by radio frequency magnetron sputtering technique. The effect of Nb on the structural, morphological, optical and electrical properties of In2O3films are analyzed using techniques such as X‐ray diffraction (XRD), micro‐Raman spectroscopy, X‐ray photoelectron spectroscopy, atomic force microscopy, field emission scanning electron microscopy (FESEM), energy dispersive X‐ray spectroscopy, UV–visible spectroscopy, spectroscopic ellipsometry, photoluminescence spectroscopy and Hall effect measurements. XRD analysis reveals that the as‐deposited undoped and Nb doped films are polycrystalline in nature with cubic bixbyite structure. Raman analysis supports the presence of cubic bixbyite structure of In2O3in the films. XPS analysis shows a decrease of oxygen deficiency due to Nb and the existence of Nb as Nb4+ in the In2O3lattice. The band gap energy of the films increases with increase in Nb concentration. PL spectra reveal intense UV and visible emissions in all the films. Optical constants of the films are determined using spectroscopic ellipsometry. The thickness of films estimated using FESEM and ellipsometry are in good agreement. The carrier concentration, mobility and nature of carriers are measured using Hall measurement technique in Van der Pauw configuration at room temperature.

show abstract

Effect of size reduction on the electronic and ferromagnetic properties of the In2O3 nanoparticles

Cited by 16 publications

References 27 publications

Enhancement of Ferromagnetism in Nonmagnetic Metal Oxide Nanoparticles by Facet Engineering

Enhancement of Ferromagnetism in Nonmagnetic Metal Oxide Nanoparticles by Facet Engineering

A study of ferromagnetic signals in SrTiO3 nanoparticles

Effect of Nb doping on the structural, morphological, optical and electrical properties of RF magnetron sputtered In₂O₃ nanostructured films

Contact Info

Product

Resources

About

Effect of size reduction on the electronic and ferromagnetic properties of the In2O3 nanoparticles

Cited by 16 publications

References 27 publications

Enhancement of Ferromagnetism in Nonmagnetic Metal Oxide Nanoparticles by Facet Engineering

Enhancement of Ferromagnetism in Nonmagnetic Metal Oxide Nanoparticles by Facet Engineering

A study of ferromagnetic signals in SrTiO3 nanoparticles

Effect of Nb doping on the structural, morphological, optical and electrical properties of RF magnetron sputtered In2O3 nanostructured films

Contact Info

Product

Resources

About

Effect of Nb doping on the structural, morphological, optical and electrical properties of RF magnetron sputtered In₂O₃ nanostructured films