Defect-induced room temperature ferromagnetism in B-doped ZnO

Yılmaz, Şerife; Nisar, Jawad; Atasoy, Yavuz; McGlynn, Enda; Ahuja, Rajeev; Parlak, M.; Bacaksız, Emin

doi:10.1016/j.ceramint.2012.11.060

Cited by 31 publications

(5 citation statements)

References 45 publications

(32 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nanomaterials and nanotechnology, being an emerging field of today's world, is extensively used in life sciences and various biomedical applications 1 . Among them, metal oxide nanoparticles, especially zinc oxide (ZnO) and magnesium oxide (MgO) nanoparticles have become an area of keen interest due to distinctive properties, that is, electrical, magnetic, optical, antibacterial, etc 2‐9 . Moreover, ZnO, with its exceptional surface and elemental properties, is multifunctional bio‐compatible material 10‐13 .…”

Section: Introductionmentioning

confidence: 99%

In vitro antibacterial response of ZnO‐MgO nanocomposites at various compositions

Amir

Bibi

Nawaz

et al. 2021

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

ZnO‐MgO nanocomposites were prepared by a co‐precipitation method and afterward compared with pristine ZnO and MgO accordingly. XRD and EDX spectra were used to confirm the crystal structure and crystallite size of these materials. X‐ray diffraction analysis shows that antibacterial activity of ZnO:MgO composite enhances with crystallite size reduction ~1.34 times in comparison to pristine ZnO or MgO specimens, accompanied by domination of defect generation over defect annihilation activity. Besides, average particle sizes also reduce to ~2 times at 1:3 MgO/ZnO composite in comparison to MgO. The particle size of ZnO was substantially higher due to rod‐like morphology. Moreover, the minimum inhibitory concentration outcomes also show that ZnO‐MgO composites are more effective against gram‐negative pathogens in appropriate ratios (ZnO:MgO) of 1:3 and 3:1 with the concentration of 15,000 µg/ml. Similarly, gram‐positive pathogens were In contrast, ZnO and MgO separately or in 1:1 composite ratio does not prove considerably effective on all the five microbes (required higher >25,000 µg/ml) MIC to counter gram‐negative pathogens. Additionally, lower doses of 3ZnO:1MgO and 1ZnO:3MgO ~5000 µg/ml composite nanoparticles are effective on gram‐positive pathogens. Similarly, 3ZnO:1MgO composition proved highly productive at a much lower concentration, that is, 12500 ≤ X ≤ 15000 to counter gram‐negative pathogens. Besides, 1ZnO:3MgO is effective against gram‐negativepathogens at MIC ranging from 12500 ≤ X ≤ 15000 µg/ml.

show abstract

Section: Introductionmentioning

confidence: 99%

In vitro antibacterial response of ZnO‐MgO nanocomposites at various compositions

Amir

Bibi

Nawaz

et al. 2021

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…It also allows to highlight the impact of electronic states other than the ones of d -symmetry on the mediation of the ferromagnetic interaction. A p -element doping by means of lighter atoms, as for example B in ZnO, leads also to a ferromagnetic phase of this material, however in this case the occurrence of ferromagnetism is related to defect formation 15 . In contrast, doping with a heavy p element, such as Bi, leads to p-p related itinerant ferromagnetism, not defect related.…”

mentioning

confidence: 99%

Towards a new class of heavy ion doped magnetic semiconductors for room temperature applications

Lee

Subramaniam

Kowalik

et al. 2015

Sci Rep

View full text Add to dashboard Cite

The article presents, using Bi doped ZnO, an example of a heavy ion doped oxide semiconductor, highlighting a novel p-symmetry interaction of the electronic states to stabilize ferromagnetism. The study includes both ab initio theory and experiments, which yield clear evidence for above room temperature ferromagnetism. ZnBixO1−x thin films are grown using the pulsed laser deposition technique. The room temperature ferromagnetism finds its origin in the holes introduced by the Bi doping and the p-p coupling between Bi and the host atoms. A sizeable magnetic moment is measured by means of x-ray magnetic circular dichroism at the O K-edge, probing directly the spin polarization of the O(2p) states. This result is in agreement with the theoretical predictions and inductive magnetometry measurements. Ab initio calculations of the electronic and magnetic structure of ZnBixO1−x at various doping levels allow to trace the origin of the ferromagnetic character of this material. It appears, that the spin-orbit energy of the heavy ion Bi stabilizes the ferromagnetic phase. Thus, ZnBixO1−x doped with a heavy non-ferromagnetic element, such as Bi, is a credible example of a candidate material for a new class of compounds for spintronics applications, based on the spin polarization of the p states.

show abstract

“…The synthesized samples exhibit low mobility probably due the scattering mechanisms caused by the presence of NiO, Zn 1À x Ni x clusters and the wellknown structural defects (V 0 , V Zn , Zn i ). However some of those complexes are responsible of the magnetic film behavior [23,27]. The high concentration and mobility values are useful to be applied in spintronic devices [28].…”

Section: Resultsmentioning

confidence: 98%

Synthesis and characterization of nanostructured magnetoresistive Ni doped ZnO films

Montes-Valenzuela¹,

Romero-Paredes²,

Vázquez-Agustín

et al. 2015

Materials Science in Semiconductor Processing

View full text Add to dashboard Cite

Defect-induced room temperature ferromagnetism in B-doped ZnO

Cited by 31 publications

References 45 publications

In vitro antibacterial response of ZnO‐MgO nanocomposites at various compositions

In vitro antibacterial response of ZnO‐MgO nanocomposites at various compositions

Towards a new class of heavy ion doped magnetic semiconductors for room temperature applications

Synthesis and characterization of nanostructured magnetoresistive Ni doped ZnO films

Contact Info

Product

Resources

About