Ferroelectric and ferromagnetic properties in BaTiO{sub 3} thin films on Si (100)
- Materials Science Division, Army Research Office, Research Triangle Park, North Carolina 27709 (United States)
- Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States)
In this paper, we report on the epitaxial integration of room temperature lead-free ferroelectric BaTiO{sub 3} thin (∼1050 nm) films on Si (100) substrates by pulsed laser deposition technique through a domain matching epitaxy paradigm. We employed MgO and TiN as buffer layers to create BaTiO{sub 3}/SrRuO{sub 3}/MgO/TiN/Si (100) heterostructures. C-axis oriented and cube-on-cube epitaxial BaTiO{sub 3} is formed on Si (100) as evidenced by the in-plane and out-of-plane x-ray diffraction, and transmission electron microscopy. X-ray photoemission spectroscopic measurements show that Ti is in 4(+) state. Polarization hysteresis measurements together with Raman spectroscopy and temperature-dependent x-ray diffraction confirm the room temperature ferroelectric nature of BaTiO{sub 3}. Furthermore, laser irradiation of BaTiO{sub 3} thin film is found to induce ferromagnetic-like behavior but affects adversely the ferroelectric characteristics. Laser irradiation induced ferromagnetic properties seem to originate from the creation of oxygen vacancies, whereas the pristine BaTiO{sub 3} shows diamagnetic behavior, as expected. This work has opened up the route for the integration of room temperature lead-free ferroelectric functional oxides on a silicon platform.
- OSTI ID:
- 22314399
- Journal Information:
- Journal of Applied Physics, Vol. 116, Issue 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
EPITAXY
FERROELECTRIC MATERIALS
HYSTERESIS
LASER RADIATION
LAYERS
MAGNESIUM OXIDES
PHOTOEMISSION
POLARIZATION
PULSED IRRADIATION
SILICON
SUBSTRATES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
THIN FILMS
TITANATES
X RADIATION
X-RAY DIFFRACTION