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  • AIP Publishing  (129)
  • 1
    Online Resource
    Online Resource
    A direct tensile device to investigate the critical current properties in superconducting tapes
    AIP Publishing ; 2014
    In:  Review of Scientific Instruments Vol. 85, No. 2 ( 2014-02-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 85, No. 2 ( 2014-02-01)
    Abstract: We construct an instrument to study the behavior of the critical current in superconducting tapes as a function of magnetic field and axial tension strain. The apparatus combines a material testing machine made by the non-magnetic stainless steel, which is capable of producing mechanical forces up to 1000 N and magnetic field up to 5 T with a homogeneous range of Φ150 × 110 mm. Moreover, the apparatus allows the automatic measurement of time dependence of voltage (V-t) under different magnetic fields and applied strains, which can be used to investigate the vortex instability and its time effect in the superconducting tapes. As an example, the simultaneous measurements of critical current and voltage relaxation with time at various strains and magnetic fields for the YaBa2Cu3O7−x coated conductors are carried out. Comparisons are made with the earlier reports in literature; the strain and magnetic field dependence of critical current indicate consistent behavior of this instrument.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.4865119
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 2
    Online Resource
    Online Resource
    O-band InAs/GaAs quantum-dot microcavity laser on Si (001) hollow substrate by in-situ hybrid epitaxy
    AIP Publishing ; 2019
    In:  AIP Advances Vol. 9, No. 1 ( 2019-01-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 9, No. 1 ( 2019-01-01)
    Abstract: Recent years, the emergence of hyper-scale data centers boosted the research field of integrated silicon photonics. One of the major challenges for compact photonic integrated circuits is silicon based lasers. In this paper, we demonstrate optically pumped InAs/GaAs quantum-dot micropillar laser on exact Si (001) by (111)-faceted-sawtooth Si hollow structure via IV/III-V hybrid epitaxy. The lasing threshold of InAs/GaAs quantum-dot micropillar is as low as 20 μW with the pillar diameter of 15 μm. Moreover, the micropillar laser is capable of operating at maximum temperature up to 100 °C.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5065527
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2583909-3
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  • 3
    Online Resource
    Online Resource
    Effect of oxidation on the microwave absorption properties of rare-earth intermetallics La2Fe4Co10B
    AIP Publishing ; 2023
    In:  AIP Advances Vol. 13, No. 2 ( 2023-02-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 13, No. 2 ( 2023-02-01)
    Abstract: Microwave absorbers are increasingly being used to enhance shielding performance at higher frequencies. Great effort has been made to develop materials with superior reflection loss (RL), thin thickness, wide bandwidth, and low density to improve their performance in electromagnetic microwave absorption. In this work, the rare-earth intermetallics La2Fe4Co10B fine powders with planar magnetocrystalline anisotropy and high magnetization were prepared using the hydrogenation desorption (HD) technique. By heating the obtained magnetic powders in the air to slowly form an oxide layer on their surfaces, its complex permittivity can be tuned without changing its complex permeability, and its microwave absorption performance can be dramatically enhanced due to the improved impedance matching condition. For the La2Fe4Co10B/paraffin composite, the real part of the complex permittivity at 10 GHz can be reduced from 20.1 to 12.8, decreasing 36.3%. Before the oxidation, the RL of La2Fe4Co10B/paraffin composite is only −14.8 dB at 3.3 GHz under 3.4 mm thickness with an effective absorption bandwidth (EAB) of 0.9 GHz. However, after the 10-hour oxidation, the RL changes to −15.6 dB at 13.4 GHz under 1.4 mm thickness with an EAB of 6.2 GHz. As an efficient and lightweight absorber, La2Fe4Co10B/paraffin composite has potential application value in constructing a new microwave absorber.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/9.0000487
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2583909-3
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  • 4
    Online Resource
    Online Resource
    Co-doping: An effective strategy for developing stable and high-speed Sb2Te-based phase-change memory
    AIP Publishing ; 2023
    In:  Applied Physics Letters Vol. 122, No. 22 ( 2023-05-29)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 122, No. 22 ( 2023-05-29)
    Abstract: Balancing operation speed and thermal stability is a big challenge in phase change memory (PCM). In this work, a carbon (C) and chromium (Cr) co-doped Sb2Te strategy has been proposed for achieving high operation speed and high stability in PCM applications. In general, doping with the appropriate Cr element is beneficial to improve thermal stability, but it will sacrifice its operation speed. C-doping can enhance thermal stability and retain its fast phase transition properties due to the carbon elements tend to form agglomerates in the host that ameliorate disorder of the amorphous phase without loss of the phase transition rate. Intriguingly, the as-prepared C1.19Cr0.23Sb2Te material exhibits good data retention (T10-year @ 155.0 °C) and low-volume change rate (1.8%), as well as fast switching speed (4 ns) and good endurance ( & gt;1 × 105 cycles). This research indicates that C and Cr co-doping is an effective method to achieve excellent stability of phase-change materials without sacrificing the phase-transition rate of Sb2Te materials.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0146349
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 5
    Online Resource
    Online Resource
    Transferable and flexible resistive switching memory devices based on PMMA films with embedded Fe3O4 nanoparticles
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 110, No. 19 ( 2017-05-08)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 110, No. 19 ( 2017-05-08)
    Abstract: We demonstrated transferable and flexible resistive switching (RS) memory devices using a nondestructive water-dissolution method. To satisfy future demands, the free-standing Al/Fe3O4-PMMA/Al devices were transferred onto various nonconventional substrates to demonstrate various features, such as flexibility, 3-D conformality, and biocompatibility. Thanks to the strong van der Waals interaction, the devices can easily conform to these substrates and normally display RS behavior even after undergoing bending tests. In particular, the memory devices with the PET substrate present excellent memory performance as well as high flexibility, including fast switching speed ( & lt;50 ns), large ROFF/RON ratio (∼4 × 105), and long retention time ( & gt;104 s). No performance degradation occurs after bending the device to different angles and up to 104 times. The RS mechanism can be attributed to the trapping/de-trapping of electrons at the sites of Fe3O4 nanoparticles. This result provides a feasible approach to achieve transferable RS memory device for future conformal and flexible electronics.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4983382
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Remote in situ laser-induced breakdown spectroscopic approach for diagnosis of the plasma facing components on experimental advanced superconducting tokamak
    AIP Publishing ; 2018
    In:  Review of Scientific Instruments Vol. 89, No. 7 ( 2018-07-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 89, No. 7 ( 2018-07-01)
    Abstract: The diagnosis of the fuel retention and impurity deposition on the plasma facing components (PFCs) is very important for monitoring plasma-wall interactions and improving the performance of long-pulse operation for tokamak devices. In this study, a remote in situ laser-induced breakdown spectroscopic (RIS-LIBS) system has been developed to be an effective and routine method for the diagnosis of the composition of the PFCs on Experimental Advanced Superconducting Tokamak (EAST). The RIS-LIBS system can be operated between EAST discharges via a remote network control system. This allows a flexible diagnosis for the PFCs at a specific EAST discharge operation or under planned plasma scenarios according to the experimental requirement. Measurements on the fuel retention and impurity deposition of the PFCs have been performed for the test of the RIS-LIBS system, and the depth resolution and the lateral resolution of the RIS-LIBS system have been achieved to be ∼100 nm and ∼3.0 mm, respectively. For the test of detectable elements, the fuel (deuterium) and impurities have been detected and identified clearly. In addition, the measurement of fuel abundance on the first wall as a function of the days of EAST deuterium plasma discharges has been carried out for the first time. These results well manifest a significant prospect of the RIS-LIBS for the diagnosis of the PFCs in the upcoming fusion devices like China Fusion Engineering Test Reactor (CFETR) and ITER.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.5024848
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 7
    Online Resource
    Online Resource
    Real-time detection of viruses in aerosols with weak light imaging based on Tesla discharge
    AIP Publishing ; 2022
    In:  Applied Physics Letters Vol. 121, No. 6 ( 2022-08-08)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 121, No. 6 ( 2022-08-08)
    Abstract: The analysis and detection of nucleic acid and specific antigens and antibodies are the most basic technologies for virus monitoring. However, the potential window for applying these technologies exists within a late specific period in the early monitoring and control of unknown viruses, especially human and animal pathogenic viruses transmitted via aerosols, e.g., SARS-CoV-2 and its variants. This is because early, real-time, and convenient monitoring of unknown viruses in the air or exhaled gas cannot be directly achieved through existing technologies. Herein, we report a weak light spectral imaging technology based on Tesla discharge (termed T-DAI) that can quickly monitor for viruses in real time in simulated aerosols with 71% sensitivity and 76% specificity for aerosol virus concentrations exceeding approximately 2800 vp/μl. This technology realizes the rapid detection of low concentrations of viruses in aerosols and could provide an important means for predicting, screening, and monitoring unknown or pandemic pathogenic viruses in the air or exhaled breath of humans and animals.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0104527
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 8
    Online Resource
    Online Resource
    Observation of split defect-bound excitons in twisted WSe2/WSe2 homostructure
    AIP Publishing ; 2020
    In:  Applied Physics Letters Vol. 117, No. 15 ( 2020-10-12)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 117, No. 15 ( 2020-10-12)
    Abstract: The excitonic effects in two-dimensional transition metal dichalcogenides and their heterostructures have been extensively investigated. Significantly, the moiré excitons, induced by a moiré superlattice in a twisted heterostructure, have triggered tremendous attention, demonstrating the practicability of artificial excitonic crystals. Besides, recent works have shown that the excitonic states in homostructures also exhibit novel properties worthy of further development. Here, we present a tear-and-stack technique for fabricating a regular or a twisted homostructure. Such a strategy was utilized to reassemble a monolayer WSe2 into a twisted homostructure, and various excitons from this structure have been identified in the photoluminescence spectra. Interestingly, the unusual equidistant splitting was first observed in the defect-bound excitons. It is believed that this phenomenon is attributed to the various defect states and the local stacking patterns. This interpretation is supported by theoretical calculations, which show the dependence of the energy band structure on different defect states and local stacking patterns. These unconventional defect-bound excitons are key building blocks in the research of homostructures that highlight the feasibility of artificially manipulating local excitons for practical applications.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0015431
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 9
    Online Resource
    Online Resource
    Magnetic properties of (Nd0.9R0.1)5Fe17 with R=Sm, Gd, and Y
    AIP Publishing ; 1994
    In:  Journal of Applied Physics Vol. 76, No. 10 ( 1994-11-15), p. 6766-6768
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 76, No. 10 ( 1994-11-15), p. 6766-6768
    Abstract: Magnetic properties of (Nd0.9R0.1)5Fe17 have been investigated. Samples were prepared by arc melting and annealed at 600 °C for 48 days. X-ray diffraction and thermomagnetic analyses showed that the samples are almost single phase with the Nd5Fe17 structure when R=Sm, Gd, and Y, but this structure cannot be formed when R=Pr. The effects of R substitution on saturation magnetization, Curie temperature, and lattice parameters are reported. X-ray diffraction analyses of aligned powders suggests that these samples have basal plane anisotropy. The magnetization does not fully saturate along the field in a field up to 70 kOe although the magnetization curves show the characteristic behavior of a soft ferromagnetic material.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.358125
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1994
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 10
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    Online Resource
    Influence of thin metal nanolayers on the photodetective properties of ZnO thin films
    AIP Publishing ; 2009
    In:  Journal of Applied Physics Vol. 106, No. 8 ( 2009-10-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 106, No. 8 ( 2009-10-15)
    Abstract: We investigate the photoconductivity properties of ZnO thin films prepared by pulsed laser deposition with and without metals (Au or Pt) on the surface. The covering of nanostructured metals can largely enhance the photocurrent. Meanwhile, the dark currents have been increased significantly due to the increase in carrier concentration and mobility near the surface of ZnO thin film. Although plasmonic effect was observed by the photoluminescence enhancement, the main mechanism of the increase in the dark current and photoresponsivity for ZnO photoconductors has been interpreted by surface states, interface states, and persistent photoconductivity.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3251370
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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