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Title: Structural, optical, and magnetic properties of highly-resistive Sm-implanted GaN thin films

Samarium ions of 200 keV in energy were implanted into highly-resistive molecular-beam-epitaxy grown GaN thin films with a focused-ion-beam implanter at room temperature. The implantation doses range from 1 × 10{sup 14} to 1 × 10{sup 16 }cm{sup −2}. Structural properties studied by x-ray diffraction and Raman-scattering spectroscopy revealed Sm incorporation into GaN matrix without secondary phase. The optical measurements showed that the band gap and optical constants changed very slightly by the implantation. Photoluminescence measurements showed emission spectra similar to p-type GaN for all samples. Magnetic investigations with a superconducting quantum interference device identified magnetic ordering for Sm dose of and above 1 × 10{sup 15 }cm{sup −2} before thermal annealing, while ferromagnetism was only observed after thermal annealing from the sample with highest Sm dose. The long-range magnetic ordering can be attributed to interaction of Sm ions through the implantation-induced Ga vacancy.
Authors:
; ; ; ; ;  [1] ; ;  [2] ; ; ;  [3] ;  [3] ;  [4] ;  [5] ;  [6]
  1. Department of Physics, National Taiwan Normal University, 11677 Taipei City, Taiwan (China)
  2. Experimentalphysik, Universität Duisburg-Essen, 47057 Duisburg (Germany)
  3. Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum (Germany)
  4. (France)
  5. Department of Physics, National Taiwan University, 10617 Taipei City, Taiwan (China)
  6. Centre de Recherche sur l'Hétéroépitaxie et ses Application, 06560 Valbonne, UPR-CNRS (France)
Publication Date:
OSTI Identifier:
22308542
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 4; 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 STRUCTURE; EMISSION SPECTRA; FERROMAGNETISM; GALLIUM NITRIDES; ION BEAMS; ION IMPLANTATION; KEV RANGE 100-1000; MAGNETIC PROPERTIES; MAGNETIZATION; MOLECULAR BEAM EPITAXY; OPTICAL PROPERTIES; PHOTOLUMINESCENCE; PHYSICAL RADIATION EFFECTS; RAMAN EFFECT; SAMARIUM IONS; SPECTROSCOPY; SQUID DEVICES; THIN FILMS; X-RAY DIFFRACTION