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

Journal Article · Mon Jul 28 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4891184· OSTI ID:22311204

Prater, J. T. ^[1]; Lee, Y. F.; Narayan, J. ^[2]; Smirnov, A. I. ^[3]

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1. Materials Science Division, Army Research Office, Research Triangle Park, North Carolina 27709 (United States)
2. Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States)
3. Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695 (United States)

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.

• OSTI ID: 22311204
• Journal Information: Applied Physics Letters, Vol. 105, Issue 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

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