Dual ion beam assisted magnetron deposition of biaxially textured YSZ and YBCO/YSZ thin films

Gnanarajan, S.; Savvides, N.

doi:10.1016/j.surfcoat.2016.08.013

Cited by 2 publications

(3 citation statements)

References 54 publications

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“…The samples were grown on n-Si (001) substrate by using ion beam co-sputtering techniques. The Kaufman-type ion source (caliber: 30 mm) was used to generate an Ar + ion beam [23]. The background vacuum and depositing Ar-gas pressure were 2.3 × 10 −6 Torr and 2.7 × 10 −4 Torr, respectively.…”

Section: Methodsmentioning

confidence: 99%

High Curie Temperature Achieved in the Ferromagnetic MnxGe1−x/Si Quantum Dots Grown by Ion Beam Co-Sputtering

Duan

Yang

et al. 2022

Nanomaterials

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Ferromagnetic semiconductors (FMSs) exhibit great potential in spintronic applications. It is believed that a revolution of microelectronic techniques can take off, once the challenges of FMSs in both the room-temperature stability of the ferromagnetic phase and the compatibility with Si-based technology are overcome. In this article, the MnxGe1−x/Si quantum dots (QDs) with the Curie temperature (TC) higher than the room temperature were grown by ion beam co-sputtering (IBCS). With the Mn doping level increasing, the ripening growth of MnGe QDs occurs due to self-assembly via the Stranski–Krastanov (SK) growth mode. The surface-enhanced Raman scattering effect of Mn sites observed in MnGe QDs are used to reveal the distribution behavior of Mn atoms in QDs and the Si buffer layer. The Curie temperature of MnxGe1−x QDs increases, then slightly decreases with increasing the Mn doping level, and reaches its maximum value of 321 K at the doping level of 0.068. After a low-temperature and short-time annealing, the TC value of Mn0.068Ge0.932 QDs increases from 321 K to 383 K. The higher Ge composition and residual strain in the IBCS grown MnxGe1−x QDs are proposed to be responsible for maintaining the ferromagnetic phase above room temperature.

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Section: Methodsmentioning

confidence: 99%

High Curie Temperature Achieved in the Ferromagnetic MnxGe1−x/Si Quantum Dots Grown by Ion Beam Co-Sputtering

Duan

Yang

et al. 2022

Nanomaterials

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“…It occupies five different positions [1,2]. The oxygen density of O(1) sites is determined in terms of a growth condition depending on ambient atmospheres or vacuum, particularly on the growth temperature and oxygen partial pressure [3,4]. O (2) and O(3) sites in a pair of CuO 2 planes are invariably filled [5].…”

Section: Introductionmentioning

confidence: 99%

“…O (2) and O(3) sites in a pair of CuO 2 planes are invariably filled [5]. O (4) positioned between Cu(1) and Cu (2) atoms are called the apex-o or bridge-site oxygen. Djokić et al [6] have computed the configuration of YBCO-based coated conductors for applications in resistive superconducting fault current limiters.…”

Section: Introductionmentioning

confidence: 99%

Investigation of temperature dependence of Raman and photoluminescence analysis of YBa2Cu3O7 (YBCO) doped with SiO2 nanoparticles

Almessiere

2018

SCI SINTER

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We report the effect of SiO 2 nanoparticles (12 nm) in YBa 2 Cu 3 O 7 (YBCO) matrix. The samples YBCO and SiO 2 +YBCO are fabricated by a conventional solid-state reaction method, in ambiance conditions. We analyze these samples using X-ray diffraction (XRD), resonant Raman, environmental scanning electron microscopy (ESEM), and Photoluminescence (PL) as a function of temperature in the range from 77 to 837 K. The XRD confirm that the doped YBCO still displays a perovskite structure with the orthorhombic Pmmm phase. The Rietveld refinement confirms that SiO 2 nanoparticles induce not only a strong effect on the oxygen's O(5) and O(8) positions but also an elongation of the unit cell along the c-axis. The PL intensity of pure YBCO is more intense than the doped one that is mainly composed of two bands located at 2.4 eV and 1.88 eV. We simulate the PL intensity with temperature using the Bose-Einstein model with two activation energies corresponding to some specific vibration mode energies. The simulation reveals that the exchange energy between different levels in pure and doped YBCO is conducted by only two vibrations modes that are strongly linked to the oxygen and copper atoms in the YBCO matrix. We determine the evolution of Raman mode frequencies at 340 and 500 cm −1 with temperature using the Lorentzian function at q = 0 of the Balkanski model.

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Dual ion beam assisted magnetron deposition of biaxially textured YSZ and YBCO/YSZ thin films

Cited by 2 publications

References 54 publications

High Curie Temperature Achieved in the Ferromagnetic MnxGe1−x/Si Quantum Dots Grown by Ion Beam Co-Sputtering

High Curie Temperature Achieved in the Ferromagnetic MnxGe1−x/Si Quantum Dots Grown by Ion Beam Co-Sputtering

Investigation of temperature dependence of Raman and photoluminescence analysis of YBa2Cu3O7 (YBCO) doped with SiO2 nanoparticles

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