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Title: Laser annealing induced ferromagnetism in SrTiO{sub 3} single crystal

The appearance of ferromagnetic order up to 400 K upon KrF (248 nm) laser irradiation is reported in un-doped SrTiO{sub 3} (STO) single crystal. The high resolution x-ray photo emission spectroscopy (XPS) measurements reveal a strong shift of Sr-, Ti-, and O-related peaks. X-ray diffraction of laser annealed STO does not reveal a signature of either secondary magnetic or amorphous phases. 300 K X-band (∼9.543 GHz) angle-dependent electron paramagnetic resonance (EPR) measurements showed no evidence of additional magnetic peaks upon laser irradiation. XPS and EPR data did not provide a strong evidence of Ti{sup 3+} formation upon laser annealing. No differences in the visible 300 K Raman spectra of pristine and laser annealed STO are noticed. Interestingly, the magnetic moment is decreased by almost 10-fold upon oxygen annealing of laser annealed STO, inferring that oxygen vacancies play an important role in establishing the observed ferromagnetism.
Authors:
;  [1] ;  [2] ; ;  [3] ;  [4]
  1. Materials Science Division, Army Research Office, Research Triangle Park, North Carolina 27709 (United States)
  2. (United States)
  3. Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States)
  4. Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695 (United States)
Publication Date:
OSTI Identifier:
22311204
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; 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; AMORPHOUS STATE; ANNEALING; DOPED MATERIALS; ELECTRON SPIN RESONANCE; EMISSION SPECTROSCOPY; FERROMAGNETISM; LASER RADIATION; LASER-RADIATION HEATING; MAGNETIC MOMENTS; MONOCRYSTALS; RAMAN SPECTRA; RESOLUTION; STRONTIUM TITANATES; TITANIUM IONS; VACANCIES; X RADIATION; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY