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Title: Effect of Mn doping on the structural, morphological, optical and magnetic properties of indium tin oxide films

Abstract

We report high temperature ferromagnetism in Mn (3 - 4 at.%) doped optically transparent indium tin oxide (ITO) films prepared by a sol-gel based technique. The films showed 16 - 18 nm sized uniformly distributed particles with high phase purity. Magnetic measurements yield a coercivity Hc ~ 80 Oe and a saturation magnetization Ms ~ 0.39 μB/Mn2+ ion at 300 K with a Tc > 600 K for the 3.2% Mn doped ITO film. Magnetic force microscopy showed convincing evidence of a uniformly distributed ferromagnetic phase with well defined magnetic domains spread over hundreds of independent nanoparticles.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
920964
Report Number(s):
PNNL-SA-46437
9995; KP1704020; TRN: US200805%%170
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Materials Science. Materials in Electronics, 18(12):1197-1201; Journal Volume: 18; Journal Issue: 12
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; INDIUM OXIDES; TIN OXIDES; MANGANESE; DOPED MATERIALS; FERROMAGNETISM; MAGNETIC PROPERTIES; MORPHOLOGY; OPTICAL PROPERTIES; Environmental Molecular Sciences Laboratory

Citation Formats

Reddy, K M, Hays, Jason, Kundu, S, Dua, L K, Biswas, P K, Wang, Chong M, Shutthanandan, V, Engelhard, Mark H, Mathew, X, and Punnoose, Alex. Effect of Mn doping on the structural, morphological, optical and magnetic properties of indium tin oxide films. United States: N. p., 2007. Web. doi:10.1007/s10854-007-9277-6.
Reddy, K M, Hays, Jason, Kundu, S, Dua, L K, Biswas, P K, Wang, Chong M, Shutthanandan, V, Engelhard, Mark H, Mathew, X, & Punnoose, Alex. Effect of Mn doping on the structural, morphological, optical and magnetic properties of indium tin oxide films. United States. doi:10.1007/s10854-007-9277-6.
Reddy, K M, Hays, Jason, Kundu, S, Dua, L K, Biswas, P K, Wang, Chong M, Shutthanandan, V, Engelhard, Mark H, Mathew, X, and Punnoose, Alex. Fri . "Effect of Mn doping on the structural, morphological, optical and magnetic properties of indium tin oxide films". United States. doi:10.1007/s10854-007-9277-6.
@article{osti_920964,
title = {Effect of Mn doping on the structural, morphological, optical and magnetic properties of indium tin oxide films},
author = {Reddy, K M and Hays, Jason and Kundu, S and Dua, L K and Biswas, P K and Wang, Chong M and Shutthanandan, V and Engelhard, Mark H and Mathew, X and Punnoose, Alex},
abstractNote = {We report high temperature ferromagnetism in Mn (3 - 4 at.%) doped optically transparent indium tin oxide (ITO) films prepared by a sol-gel based technique. The films showed 16 - 18 nm sized uniformly distributed particles with high phase purity. Magnetic measurements yield a coercivity Hc ~ 80 Oe and a saturation magnetization Ms ~ 0.39 μB/Mn2+ ion at 300 K with a Tc > 600 K for the 3.2% Mn doped ITO film. Magnetic force microscopy showed convincing evidence of a uniformly distributed ferromagnetic phase with well defined magnetic domains spread over hundreds of independent nanoparticles.},
doi = {10.1007/s10854-007-9277-6},
journal = {Journal of Materials Science. Materials in Electronics, 18(12):1197-1201},
number = 12,
volume = 18,
place = {United States},
year = {Fri Apr 27 00:00:00 EDT 2007},
month = {Fri Apr 27 00:00:00 EDT 2007}
}
  • Indium tin oxide (ITO) and Ag (1.2{+-}0.1 at. %)-ITO films with the thickness of 130 nm were deposited on glass substrates at room temperature by dc magnetron sputtering and postannealed at the temperature range of 200-400 deg. C. By calculating the x-ray diffraction data, the lattice constants of all samples were obtained and the results show that the annealing led to the smaller lattice constants and the Ag doping resulted in the further lattice distortion. The refractive index n and extinction coefficient k of all samples were extracted from the transmittance spectra by means of the spectroscopic ellipsometry optimization method.more » Ag-ITO film annealed at 400 deg. C has the high transmittance of 80%-90% in the visible wavelength range. Ag doping dramatically increased the extinction coefficient k of ITO films in UV wavelength range but almost without change in it in visible band. Meanwhile, by contrast with ITO films, Ag-ITO films show much higher n values than that of ITO films. Finally, the optical band gaps of all samples were determined, and it has been found that there is almost no difference of band gaps between ITO and Ag-ITO films. The reasons of the influence of annealing and Ag doping on structural and optical properties of ITO thin films are discussed.« less
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  • In this paper, we investigated whether the optical and electrical properties of indium tin oxide (ITO) films are degraded under laser irradiation below their laser ablation threshold. While performing multi-pulse laser damage experiments on a single ITO film (4.7 ns, 1064 nm, 10 Hz), we examined the optical and electrical properties in situ. A decrease in reflectance was observed prior to laser damage initiation. However, under sub-damage threshold irradiation, conductivity and reflectance of the film were maintained without measurable degradation. This indicates that ITO films in optoelectronic devices may be operated below their lifetime laser damage threshold without noticeable performancemore » degradation.« less
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