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Title: Ferromagnetic and paramagnetic magnetization of implanted GaN:Ho,Tb,Sm,Tm films

The SQUID magnetic measurements were performed on the GaN films prepared by metal-organic vapour phase epitaxy and implanted by Tb{sup 3+}, Tm{sup 3+}, Sm{sup 3+}, and Ho{sup 3+} ions. The sapphire substrate was checked by the electron paramagnetic resonance method which showed a content of Cr{sup 3+} and Fe{sup 3+} impurities. The samples 5 × 5 mm{sup 2} were positioned in the classical straws and within an estimated accuracy of 10{sup −6 }emu, no ferromagnetic moment was detected in the temperature region of 2–300 K. The paramagnetic magnetization was studied for parallel and perpendicular orientation. In the case of GaN:Tb sample, at T = 2 K, a pronounced anisotropy with the easy axis perpendicular to the film was observed which can be explained by the lowest quasi-doublet state of the non-Kramers Tb{sup 3+} ion. The Weiss temperature deduced from the susceptibility data using the Curie-Weiss (C-W) law was found to depend substantially on the magnetic field.
Authors:
; ;  [1] ; ; ; ;  [2] ;  [3] ;  [4] ;  [3] ; ;  [5] ;  [6] ;  [7] ;  [4]
  1. Institute of Physics of ASCR v.v.i., Cukrovarnická 10, 162 00 Prague 6 (Czech Republic)
  2. Department of Inorganic Chemistry, Institute of Chemical Technology, 166 28 Prague 6 (Czech Republic)
  3. Peter Grünberg Institut, PGI-9, Forschung Centrum, Jülich D-52425 (Germany)
  4. (Germany)
  5. Nuclear Physics Institute of the ASCR v.v.i., 250 68 Řež (Czech Republic)
  6. (Czech Republic)
  7. Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden (Germany)
Publication Date:
OSTI Identifier:
22409992
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; 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; CHROMIUM IONS; CURIE-WEISS LAW; ELECTRON SPIN RESONANCE; FILMS; GALLIUM NITRIDES; HOLMIUM IONS; IRON IONS; MAGNETIC FIELDS; MAGNETIZATION; ORGANOMETALLIC COMPOUNDS; PARAMAGNETISM; SAMARIUM IONS; SAPPHIRE; SQUID DEVICES; SUBSTRATES; TERBIUM IONS; THULIUM IONS; VAPOR PHASE EPITAXY