Polarization-dependent Raman spectra of heteroepitaxial<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mi mathvariant="normal">Ba</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant="normal">Sr</mml:mi><mml:mo>)</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">TiO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>/</mml:mo><mml:mi mathvariant="normal">MgO</mml:mi></mml:math>thin films

Yuzyuk, Yu. I.; Alyoshin, V. A.; Zakharchenko, I. N.; Sviridov, E. V.; Almeida, A.; Chaves, M. R.

doi:10.1103/physrevb.65.134107

Cited by 64 publications

(40 citation statements)

References 45 publications

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“…The frequency of the E(1TO) soft mode increases with decreasing the modulated period from 115 cm -1 (Λ = 136 Å) to 124 cm -1 (Λ = 64 Å). We already reported [11,22,23,25] that a significant shift of the E(TO) soft mode can be observed due to two-dimensional 2D stress imposed by the substrate; however, in the case of BT/ST SL grown on MgO the upward shift of the soft mode …”

Section: Methodsmentioning

confidence: 99%

“…An optical microscope with 80X objective was used to focus the incident light in a spot of about 2 µm in diameter on the sample. The polarized Raman spectra were obtained in side-view backscattering geometries [17,18]. All Raman spectra in this work were corrected for the Bose-Einstein temperature factor and intensities were normalized.…”

Section: Methodsmentioning

confidence: 99%

“…The ferroelectric soft mode is usually very sensitive to strain in thin films [11,18,19,[22][23][24] and so investigation of soft mode behavior in ferroelectric SLs is very useful for better understanding of their physical properties. modes.…”

Section: Methodsmentioning

confidence: 99%

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Effect of periodicity and composition in artificial BaTiO3/(Ba,Sr)TiO3superlattices

et al. 2011

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Effect of periodicity and composition in artificial BaTiO3/(Ba,Sr)TiO3superlattices

et al. 2011

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“…In particular, the first Raman peak at 170 cm −1 corresponds to a vibration of barium against the TiO 6 octahedron. The vibrations at 525 and 750 cm −1 which are associated with the A 1 TO and the A 1 LO mode correspond to a change of the Ti-O-Ti bond angle [41]. The broad peaks of the Fe-doped BST thin films compared with the narrow-shaped Raman peaks of pure BaTiO 3 indicate that the Raman selection rule obviously is relaxed.…”

Section: Elemental Compositionmentioning

confidence: 99%

Characterization of non-stoichiometric co-sputtered Ba0.6Sr0.4(Ti1 − x Fe x )1 + x O3 − δ thin films for tunable passive microwave applications

et al. 2011

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The fabrication of novel iron-doped barium strontium titanate thin films by means of radio frequency (RF) magnetron co-sputtering is shown. Investigations of the elemental composition and the dopant distribution in the thin films obtained by X-ray photoelectron spectroscopy, Rutherford backscattering spectrometry, and time-of-flight secondary ion mass spectroscopy reveal a homogeneous dopant concentration throughout the thin film. The incorporation of the iron dopant and the temperature-dependent evolution of the crystal structure and morphology are analyzed by electron paramagnetic resonance spectroscopy, X-ray diffraction, Raman spectroscopy, atomic force microscopy, and scanning electron microscopy. In summary, these results emphasize the RF magnetron co-sputter process as a versatile way to fabricate doped thin films.

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“…The peaks at 235, 305, 519, and 720 cm À1 can be assigned to A1 (2TO), E (3TO þ 2LO) þ B1, A1 (3TO), and E (4LO) phonon modes, respectively. [18][19][20] The presence of peaks at 305 and 720 cm À1 in Raman spectra of the target evidences its tetragonal symmetry. The Raman spectra of films grown on different substrates consist of the referred above peaks, but their positions are slightly shifted as compared to the target.…”

Section: -2mentioning

confidence: 99%

Effect of Pt bottom electrode texture selection on the tetragonality and physical properties of Ba0.8Sr0.2TiO3 thin films produced by pulsed laser deposition

Silva¹,

Sekhar²,

Almeida³

et al. 2012

Journal of Applied Physics

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Electric field induced instabilities of thin leaky bilayers: Pathways to unique morphologies and miniaturization J. Chem. Phys. 138, 024705 (2013) Electric field-tunable BaxSr1−xTiO3 films with high figures of merit grown by molecular beam epitaxy Appl. Phys. Lett. 101, 252906 (2012) The penetration limit of poly(4-vinyl phenol) thin films for etching via holes by inkjet printing Appl. Phys. Lett. 101, 253302 (2012) The penetration limit of poly(4-vinyl phenol) thin films for etching via holes by inkjet printing APL: Org. Electron. Photonics 5, 270 (2012) Numerical simulations of electrostatic interactions between an atomic force microscopy tip and a dielectric sample in presence of buried nano-particles J. Appl. Phys. 112, 114313 (2012) Additional information on J. Appl. Phys. The effect of platinum (Pt) bottom electrode texture on the tetragonality, dielectric, ferroelectric, and polarization switching response of pulsed laser deposited Ba 0.8 Sr 0.2 TiO 3 (BST) thin films has been studied. The x-ray diffraction and Raman analysis revealed the higher tetragonality of BST films when they were grown on higher (111) textured Pt layer. The properties like dielectric permittivity, polarization, switching time, and leakage currents were found to be correlated to tetragonality and orientation of the BST films. The polarization current was observed to be higher in BST films on Pt epitaxial layer and it exhibits exponential dependence on the electric field. The voltage-current measurements displayed Ohmic behavior of leakage current irrespective of Pt texture for low voltages (up to 1 V), whereas at higher voltages the conduction mechanism was found to be dependent on texture selection of bottom Pt electrode. V C 2012 American Institute of Physics. [http://dx

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Polarization-dependent Raman spectra of heteroepitaxial(Ba,Sr)TiO3/MgOthin films

Cited by 64 publications

References 45 publications

Effect of periodicity and composition in artificial BaTiO3/(Ba,Sr)TiO3superlattices

Effect of periodicity and composition in artificial BaTiO3/(Ba,Sr)TiO3superlattices

Characterization of non-stoichiometric co-sputtered Ba0.6Sr0.4(Ti1 − x Fe x )1 + x O3 − δ thin films for tunable passive microwave applications

Effect of Pt bottom electrode texture selection on the tetragonality and physical properties of Ba0.8Sr0.2TiO3 thin films produced by pulsed laser deposition

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