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Title: Local vibrational modes competitions in Mn-doped ZnO epitaxial films with tunable ferromagnetism

We reported spectroscopic investigations of high quality Mn-doped ZnO (ZnMnO) films grown by oxygen plasma-assisted molecular beam epitaxy. Raman scattering spectra revealed two local vibrational modes (LVMs) associated with Mn dopants at 523 and 712 cm{sup −1}. The LVMs and magnetic properties of ZnMnO films can be synchronously modulated by post annealing processing or by introducing tiny Co. The relative intensity of two LVMs clearly shows competitions arising from uncompensated acceptor and donor defects competition for ferromagnetic and nonmagnetic films. The experimental results indicated that LVM at 523 cm{sup −1} is attributed to Mn—(Zinc-vacancy) complexes, while LVM at 712 cm{sup −1} is attributed to Mn—(Oxygen-vacancy) complexes.
Authors:
 [1] ;  [2] ; ; ; ; ; ;  [1] ;  [3]
  1. National Key Laboratory of Crystal Materials and School of Physics, Shandong University, Jinan, Shandong 250100 (China)
  2. (China)
  3. Department of Mechanical and Materials Engineering, Portland State University, P.O. Box 751, Portland, Oregon 97207-0751 (United States)
Publication Date:
OSTI Identifier:
22303428
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 24; Other Information: (c) 2014 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; ANNEALING; CRYSTAL DEFECTS; DOPED MATERIALS; FERROMAGNETISM; FILMS; MAGNETIC PROPERTIES; MANGANESE ADDITIONS; MOLECULAR BEAM EPITAXY; OXYGEN; PLASMA; RAMAN EFFECT; SPECTRA; VACANCIES; ZINC OXIDES