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  • AIP Publishing  (7)
  • Physics  (7)
  • 1
    Online Resource
    Online Resource
    Switchable and tunable film bulk acoustic resonator fabricated using barium strontium titanate active layer and Ta2O5/SiO2 acoustic reflector
    AIP Publishing ; 2016
    In:  Applied Physics Letters Vol. 109, No. 5 ( 2016-08-01)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 109, No. 5 ( 2016-08-01)
    Abstract: A solidly mounted acoustic resonator was fabricated using a Ba0.60Sr0.40TiO3 (BST) film deposited by metal organic chemical vapor deposition. The device was acoustically isolated from the substrate using a Bragg reflector consisting of three pairs of Ta2O5/SiO2 layers deposited by chemical solution deposition. Transmission electron microscopy verified that the Bragg reflector was not affected by the high temperatures and oxidizing conditions necessary to process high quality BST films. Electrical characterization of the resonator demonstrated a quality factor (Q) of 320 and an electromechanical coupling coefficient (Kt2) of 7.0% at 11 V.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4960361
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 2
    Online Resource
    Online Resource
    Origin of pseudoelastic behavior in Ti–Mo-based alloys
    AIP Publishing ; 2005
    In:  Applied Physics Letters Vol. 87, No. 24 ( 2005-12-12)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 87, No. 24 ( 2005-12-12)
    Abstract: High-resolution transmission electron microscopy and in situ x-ray diffraction analyses have been used to elucidate the compositional sensitivity of the deformation behavior in two β-Ti–Mo-based alloys. The alloy with 8% Mo exhibited conventional elastic∕plastic behavior in tension which corresponds to the irreversible formation of stress-induced orthorhombic α″ martensite. The alloy with 10% Mo exhibited a pronounced pseudoelastic response with recovery of ≈80% of the imposed tensile strain. This phenomenon is associated with the formation of another orthorhombic martensitic phase, which has not been reported previously, and this nucleates from pre-existing domains in the β matrix.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2142089
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 3
    Online Resource
    Online Resource
    Strain engineered barium strontium titanate for tunable thin film resonators
    AIP Publishing ; 2014
    In:  Applied Physics Letters Vol. 104, No. 20 ( 2014-05-19)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 104, No. 20 ( 2014-05-19)
    Abstract: Piezoelectric properties of epitaxial (001) barium strontium titanate (BST) films are computed as functions of composition, misfit strain, and temperature using a non-linear thermodynamic model. Results show that through adjusting in-plane strains, a highly adaptive rhombohedral ferroelectric phase can be stabilized at room temperature with outstanding piezoelectric response exceeding those of lead based piezoceramics. Furthermore, by adjusting the composition and the in-plane misfit, an electrically tunable piezoelectric response can be obtained in the paraelectric state. These findings indicate that strain engineered BST films can be utilized in the development of electrically tunable and switchable surface and bulk acoustic wave resonators.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4879281
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 4
    Online Resource
    Online Resource
    Misfit strain phase diagrams of epitaxial PMN–PT films
    AIP Publishing ; 2015
    In:  Applied Physics Letters Vol. 106, No. 8 ( 2015-02-23)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 106, No. 8 ( 2015-02-23)
    Abstract: Misfit strain–temperature phase diagrams of three compositions of (001) pseudocubic (1 − x)·Pb (Mgl/3Nb2/3)O3 − x·PbTiO3 (PMN–PT) thin films are computed using a phenomenological model. Two (x = 0.30, 0.42) are located near the morphotropic phase boundary (MPB) of bulk PMN–PT at room temperature (RT) and one (x = 0.70) is located far from the MPB. The results show that it is possible to stabilize an adaptive monoclinic phase over a wide range of misfit strains. At RT, the stability region of this phase is much larger for PMN–PT compared to barium strontium titanate and lead zirconate titanate films.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4913706
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 5
    Online Resource
    Online Resource
    Strain relaxation during in situ growth of SrTiO3 thin films
    AIP Publishing ; 2003
    In:  Applied Physics Letters Vol. 83, No. 22 ( 2003-12-01), p. 4592-4594
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 83, No. 22 ( 2003-12-01), p. 4592-4594
    Abstract: We report a real-time observation of strain relaxation during in situ growth of SrTiO3 thin films by measuring the in-plane lattice constant at the film surface using reflection high-energy electron diffraction. The initial misfit strain in the SrTiO3 film is tensile on MgO and compressive on LaAlO3 as expected from the lattice mismatches between the film and the substrates. Strain relaxation begins immediately after the deposition starts, but is not complete until the film thickness reaches 500–2500 Å depending on the substrate and the deposition temperature. The strain relaxation at the growth temperature influences the film strain at room temperature, which is compressive for both substrates for thin SrTiO3 films.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.1631055
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2003
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Misfit dislocations in nanoscale ferroelectric heterostructures
    AIP Publishing ; 2005
    In:  Applied Physics Letters Vol. 86, No. 19 ( 2005-05-09)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 86, No. 19 ( 2005-05-09)
    Abstract: We present a quantitative study of the thickness dependence of the polarization and piezoelectric properties in epitaxial (001) PbZr0.52Ti0.48O3 films grown on (001) SrRuO3-buffered (001) SrTiO3 substrates. High-resolution transmission electron microscopy reveals that even the thinnest films (∼8nm) are fully relaxed with a dislocation density close to 1012cm−2 and a spacing of approximately 12 nm. Quantitative piezoelectric and ferroelectric measurements show a drastic degradation in the out-of-plane piezoelectric constant (d33) and the switched polarization (ΔP) as a function of decreasing thickness. In contrast, lattice-matched ultrathin PbZr0.2Ti0.8O3 films that have a very low dislocation density show superior ferroelectric properties. Supporting theoretical calculations show that the variations in the strain field around the core of the dislocation leads to highly localized polarization gradients and hence strong depolarizing fields, which result in suppression of ferroelectricity in the vicinity of a dislocation.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.1922579
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 7
    Online Resource
    Online Resource
    Electrochemically tunable ultrafast optical response of graphene oxide
    AIP Publishing ; 2011
    In:  Applied Physics Letters Vol. 98, No. 14 ( 2011-04-04)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 98, No. 14 ( 2011-04-04)
    Abstract: We demonstrate reversible and irreversible changes in the ultrafast optical response of multilayer graphene oxide thin films upon electrical and optical stimulus. The reversible effects are due to electrochemical modification of graphene oxide, which allows tuning of the optical response by externally applied bias. Increasing the degree of reduction in graphene oxide causes excited state absorption to gradually switch to saturable absorption for shorter probe wavelengths. Spectral and temporal properties as well as the sign of the ultrafast response can be tuned either by changing the applied bias or exposing to high intensity femtosecond pulses.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3573797
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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