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Title: Paramagnetic dysprosium-doped zinc oxide thin films grown by pulsed-laser deposition

Dysprosium(Dy)-doped zinc oxide (Dy:ZnO) thin films were fabricated on c-oriented sapphire substrate by pulsed-laser deposition with doping concentration ranging from 1 to 10 at. %. X-ray diffraction (XRD), Raman-scattering, optical transmission spectroscopy, and spectroscopic ellipsometry revealed incorporation of Dy into ZnO host matrix without secondary phase. Solubility limit of Dy in ZnO under our deposition condition was between 5 and 10 at. % according to XRD and Raman-scattering characteristics. Optical transmission spectroscopy and spectroscopic ellipsometry also showed increase in both transmittance in ultraviolet regime and band gap of Dy:ZnO with increasing Dy density. Zinc vacancies and zinc interstitials were identified by photoluminescence spectroscopy as the defects accompanied with Dy incorporation. Magnetic investigations with a superconducting quantum interference device showed paramagnetism without long-range order for all Dy:ZnO thin films, and a hint of antiferromagnetic alignment of Dy impurities was observed at highest doping concentration—indicating the overall contribution of zinc vacancies and zinc interstitials to magnetic interaction was either neutral or toward antiferromagnetic. From our investigations, Dy:ZnO thin films could be useful for spin alignment and magneto-optical applications.
Authors:
; ; ; ; ; ;  [1] ;  [2]
  1. Department of Physics, National Taiwan Normal University, 11677 Taipei City, Taiwan (China)
  2. Department of Physics, National Taiwan University, 10617 Taipei City, Taiwan (China)
Publication Date:
OSTI Identifier:
22412866
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 21; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; CONCENTRATION RATIO; DOPED MATERIALS; DYSPROSIUM; ELLIPSOMETRY; ENERGY BEAM DEPOSITION; INTERSTITIALS; LASER RADIATION; PARAMAGNETISM; PHOTOLUMINESCENCE; PULSED IRRADIATION; SAPPHIRE; SPIN; SQUID DEVICES; SUBSTRATES; ULTRAVIOLET RADIATION; VACANCIES; X-RAY DIFFRACTION; ZINC OXIDES