Free carrier-mediated ferromagnetism in nonmagnetic ion (Bi–Li) codoped ZnO nanowires

Kazmi, Jamal; Raza, Syed Raza Ali; Ahmad, Waqas; Masood, Asad; Jalil, Abdul; Raub, A.A. Mohd; Abbas, Ali; Rafiq, Md Khan Sobayel; Mohamed, Mohd Ambri

doi:10.1039/d3cp00114h

Cited by 6 publications

(2 citation statements)

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“…In contrast to the phase segregation or clusters reported in the literature, the Ni incorporated in the ZnO matrix. The interlayer spacing was ~0.267 nm, as shown in the HRTEM image in Figure 2b, which was is comparable with our previous report, where a TEM analysis yielded an interlayer spacing of 0.26 nm for pure ZnO NWs [10,11,31,32]. A slight difference in interlayer spacing of Ni-ZnO compared with ZnO NWs is due to the slight difference of ionic radii of Ni 2+ (1.36 Å) and Zn 2+ (0.74 Å), leading to a strain in ZnO matrix.…”

Section: Resultssupporting

confidence: 91%

“…The magnetization saturates at almost ±0.2 T, and there is a small hysteresis which is an indication of a soft ferromagnetic material. While pure ZnO NWs have been reported to be diamagnetic or weak ferromagnetic at room temperature, this weak ferromagnetism diminishes over time due to oxidation [11,31,32]. The magneto-transport properties of a two-terminal device were measured using the computer-controlled Keithley 2400 source meter.…”

Section: Resultsmentioning

confidence: 99%

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Magneto-Transport and Enhanced Spin-Polarized Photo Response in Solution-Processed Vertically Aligned Zn0.9Ni0.1O Nanowires

Kazmi,

Raza

et al. 2023

Magnetochemistry

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In this study, we grew pristine and Ni-doped vertically aligned zinc oxide nanowires (NWs) on a glass substrate. Both the doped and pristine NWs displayed dominant 002 peaks, confirming their vertical alignment. The Ni-doped NWs exhibited a leftward shift compared to the pristine NWs. TEM measurements confirmed the high crystallinity of individual NWs, with a d-spacing of ~0.267 nm along the c-axis. Ni-doped NWs had a higher density, indicating increased nucleation sites due to nickel doping. Doped NW films on glass showed enhanced absorbance in the visible region, suggesting the creation of sub-gap defect levels from nickel doping. Magnetization vs. magnetic field measurements revealed a small hysteresis loop, indicative of soft ferromagnetic behavior. Current transient plots demonstrated an increase in current with an applied magnetic field. Two-terminal devices exhibited a photo response that intensified with magnetic field application. This increase was attributed to parallel grain alignment, resulting in enhanced carrier concentration and photo response. In the dark, transport properties displayed negative magnetoresistance behavior. This magneto-transport effect and enhanced photo response (under an LED at ~395 nm) were attributed to giant magnetoresistance (GMR) in the aligned NWs. The observed behavior arose from reduced carrier scattering, improved transport properties, and parallel spin alignment in the magnetic field.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%