Journal
APPLIED PHYSICS LETTERS
Volume 105, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4891184
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Funding
- National Academy of Science (NAS), USA
- State of North Carolina
- National Science Foundation
- Army Research Office [W911NF-04-D-0003]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1306400] Funding Source: National Science Foundation
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The appearance of ferromagnetic order up to 400K upon KrF (248 nm) laser irradiation is reported in un-doped SrTiO3 (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. 300K X-band (similar to 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 Ti3+ formation upon laser annealing. No differences in the visible 300K 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. (c) 2014 AIP Publishing LLC.
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