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  • AIP Publishing  (11)
  • 1
    Online Resource
    Online Resource
    SixSb2Te materials with stable phase for phase change random access memory applications
    AIP Publishing ; 2012
    In:  Journal of Applied Physics Vol. 111, No. 5 ( 2012-03-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 111, No. 5 ( 2012-03-01)
    Abstract: The physical and electrical properties of SixSb2Te system materials with various Si contents have been systemically studied with the aim of finding the most suitable composition for the phase change random access memory (PCRAM) applications. SixSb2Te shows better thermal stability than Ge2Sb2Te5 due to no Te separation under high annealing temperatures. The increase of Si content can enhance the data retention ability of SixSb2Te materials. When the value of x is larger than 0.44, the 10-year data retention temperature for SixSb2Te will exceed 110 °C, which meets the long-term data retention requirement. Furthermore, Si-rich SixSb2Te materials exhibit the improvement on thickness change after annealing compared with Ge2Sb2Te5. In addition, the PCRAM devices based on SixSb2Te (x = 0.31, 0.44) were fabricated and the electrical operations were carried out. Both of them show the outstanding performances with long-term operations.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3693557
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 2
    Online Resource
    Online Resource
    Simultaneous detection of the spin Hall magnetoresistance and Joule heating-induced spin Seebeck effect in Gd3Fe5O12/Pt bilayers
    AIP Publishing ; 2019
    In:  Journal of Applied Physics Vol. 126, No. 18 ( 2019-11-14)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 126, No. 18 ( 2019-11-14)
    Abstract: Spin Hall magnetoresistance (SMR) provides an effective tool to probe the spin structure in magnet/heavy metal bilayers. Here, we investigate the SMR in Gd3Fe5O12 (GdIG)/Pt bilayers, where GdIG is a compensated ferrimagnetic insulator. Under a finite magnetic field, GdIG has a collinear magnetic phase far away from compensated temperature (Tcomp) and noncollinear/canted magnetic phase around Tcomp of 278 K. A conventional SMR behavior is observed at different temperatures without any sign change around Tcomp. Meanwhile, an asymmetric behavior (unidirectional-like) exists in the observed SMR at the temperatures just above or below Tcomp, because of the contribution of the anisotropic magnetothermopower effect, i.e., spin Seebeck effect. The spin Seebeck effect component exhibits a sign change around Tcomp, which is correlated with the reversal of the sublattice magnetization. Our finding provides an insight into SMR and thermal spin transport in the GdIG/Pt bilayer structure.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.5117172
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 3
    Online Resource
    Online Resource
    Current transport mechanisms in lattice-matched Pt/Au-InAlN/GaN Schottky diodes
    AIP Publishing ; 2015
    In:  Journal of Applied Physics Vol. 117, No. 15 ( 2015-04-21)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 117, No. 15 ( 2015-04-21)
    Abstract: Lattice-matched Pt/Au-In0.17Al0.83N/GaN hetreojunction Schottky diodes with circular planar structure have been fabricated and investigated by temperature dependent electrical measurements. The forward and reverse current transport mechanisms are analyzed by fitting the experimental current-voltage characteristics of the devices with various models. The results show that (1) the forward-low-bias current is mainly due to the multiple trap-assisted tunneling, while the forward-high-bias current is governed by the thermionic emission mechanism with a significant series resistance effect; (2) the reverse leakage current under low electric fields ( & lt;6 MV/cm) is mainly carried by the Frenkel-Poole emission electrons, while at higher fields the Fowler-Nordheim tunneling mechanism dominates due to the formation of a triangular barrier.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4917566
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 4
    Online Resource
    Online Resource
    Inkjet-printed TMDC–graphene heterostructures for flexible and broadband photodetectors
    AIP Publishing ; 2022
    In:  Journal of Applied Physics Vol. 131, No. 23 ( 2022-06-21)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 131, No. 23 ( 2022-06-21)
    Abstract: The development of inkjet-printed 2D crystal inks offers the ability to print different 2D materials on various substrates to form vertical heterostructures. However, the detailed characterization of the atomic structures of the inkjet-printed MoTe2 nanosheets has been rarely reported. In this work, water-based 2D crystal inks of MoTe2, WS2, and graphene have been prepared and printed to obtain the flexible photodetectors. The absorption coefficient of MoTe2 has been estimated as α (500 nm) = 925 ± 47 lg−1 m−1 using the gravimetric method. Intriguingly, the inkjet-printed MoTe2 nanosheets down to 4 nm show both the semiconducting 2H and metallic 1T′ phases. The responsivities of the photodetectors based on MoTe2/graphene and WS2/graphene heterostructures can reach 120 mA/W and 2.5 A/W at 532 nm, respectively. Moreover, the inkjet-printed MoTe2/graphene shows a responsivity of 7.7 mA/W at 940 nm. The fabrication technique of inkjet printing will help design flexible optoelectronic devices based transition metal dichalcogenide–graphene heterostructures for the near-infrared photo detection.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0093882
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 5
    Online Resource
    Online Resource
    Threshold photoelectron spectroscopy of the HO2 radical
    AIP Publishing ; 2020
    In:  The Journal of Chemical Physics Vol. 153, No. 12 ( 2020-09-28)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 153, No. 12 ( 2020-09-28)
    Abstract: We report a synchrotron radiation vacuum ultraviolet photoionization study of the hydroperoxyl radical (HO2), a key reaction intermediate in combustion and atmospheric chemistry as well as astrochemistry, using double imaging photoelectron photoion coincidence spectroscopy. The HO2 radical is formed in a microwave discharge flow tube reactor through a set of reactions initiated by F atoms in a CH4/O2/He gas mixture. The high-resolution threshold photoelectron spectrum of HO2 in the 11 eV–12 eV energy range is acquired without interferences from other species and assigned with the aid of theoretically calculated adiabatic ionization energies (AIEs) and Franck–Condon factors. The three vibrational modes of the radical cation HO2+, the H–O stretch, the H–O–O bend, and the O–O stretch, have been identified, and their individual frequencies are measured. In addition, the AIEs of the X3A″ ground state and the a1A′ first excited electronic state of HO2+ are experimentally determined at 11.359 ± 0.003 eV and 11.639 ± 0.005 eV, respectively, in agreement with high-level theoretically computed results. Furthermore, the former AIE value provides validation of thermochemical networks used to extract the enthalpy of formation of the HO2 radical.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/5.0022410
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 6
    Online Resource
    Online Resource
    Threshold photoelectron spectroscopy of the methoxy radical
    AIP Publishing ; 2020
    In:  The Journal of Chemical Physics Vol. 153, No. 3 ( 2020-07-21)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 153, No. 3 ( 2020-07-21)
    Abstract: We present here a synchrotron radiation vacuum ultraviolet photoionization study of the simplest alkoxy radical, CH3O, a key reaction intermediate in atmospheric and combustion chemistry. A microwave discharge fast flow tube connected to a molecular beam sampling system is employed as a chemical reactor to initiate reactions and generate radicals. The CH3O+ cation from direct ionization of the CH3O radical is detected successfully in the photoionization mass spectrum close to its ionization threshold. In addition, after identifying and removing the contribution of the 13C-isotopic formaldehyde H213CO with the same isobaric mass m/z = 31, the high-resolution threshold photoelectron spectrum of CH3O is obtained and assigned with the aid of calculated Franck–Condon factors. The adiabatic ionization energy of CH3O is determined at 10.701 eV with an accuracy of 0.005 eV.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/5.0016146
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 7
    Online Resource
    Online Resource
    Negative capacitance switching via VO2 band gap engineering driven by electric field
    AIP Publishing ; 2015
    In:  Applied Physics Letters Vol. 106, No. 9 ( 2015-03-02)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 106, No. 9 ( 2015-03-02)
    Abstract: We report the negative capacitance behavior of an energy band gap modulation quantum well with a sandwich VO2 layer structure. The phase transition is probed by measuring its capacitance. With the help of theoretical calculations, it shows that the negative capacitance changes of the quantum well device come from VO2 band gap by continuously tuning the temperature or voltage. Experiments reveal that as the current remains small enough, joule heating can be ignored, and the insulator-metal transition of VO2 can be induced by the electric field. Our results open up possibilities for functional devices with phase transitions induced by external electric fields other than the heating or electricity-heat transition.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4914013
    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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  • 8
    Online Resource
    Online Resource
    Effect of annealing on Y/Mo multilayers
    AIP Publishing ; 1999
    In:  Journal of Applied Physics Vol. 86, No. 5 ( 1999-09-01), p. 2459-2463
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 86, No. 5 ( 1999-09-01), p. 2459-2463
    Abstract: We have studied the effect of annealing on sputter-deposited Y/Mo multilayer films with a wide range of bilayer periods, looking for evidence of solid-state amorphization. The as-deposited samples are layered, with the individual Y and Mo layers showing little or no crystallographic texture. Upon annealing at 350 °C, the Y and Mo x-ray diffraction peaks become sharper, suggesting slight grain growth, and not the consumption of Y and/or Mo by a solid-state reaction. The layered structure persists, with no change in the intensity of the low-angle superlattice lines that would suggest interdiffusion (which is a prerequisite for solid-state amorphization). Finally, analysis of the stress state of the Y and Mo layers shows essentially no change in unstrained lattice parameter, confirming that no interdiffusion occurs. We conclude that, despite recently published claims to the contrary, solid-state amorphization does not occur in the Y-Mo system. Our results are in accord with the conventional understanding that solid-state amorphization does not occur in systems with positive enthalpies of mixing.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.371076
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1999
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 9
    Online Resource
    Online Resource
    Online analysis of gas-phase radical reactions using vacuum ultraviolet lamp photoionization and time-of-flight mass spectrometry
    AIP Publishing ; 2020
    In:  Review of Scientific Instruments Vol. 91, No. 4 ( 2020-04-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 91, No. 4 ( 2020-04-01)
    Abstract: A home-made vacuum ultraviolet photoionization time-of-flight mass spectrometer has been developed and coupled to an atmospheric simulation chamber operated at atmospheric pressure and to a fast flow tube at low pressure (1–10 Torr). Gas sampling from the simulation chamber is realized directly via a capillary effusive beam, and sampling from the flow tube is via a continuous molecular beam inlet. Both devices are connected simultaneously to the ionization chamber of the mass spectrometer and can be switched in-between within minutes to study gas-phase radical reactions of atmospheric interest in a large range of reaction conditions and reaction times (from milliseconds in the flow tube to hours in the simulation chamber). A cage-shaped photoionization source combined with a commercial 10.6 eV krypton lamp has been developed to provide a high ion collection efficiency along the long light path in the cage. This way, a multiplexed detection with high sensitivity down to the sub-parts per billion volume concentration range, e.g., a limit of detection of 0.3 ppbv with an accumulation time of 60 s for benzene and 1.3 ppbv for the methyl radical, is obtained. The performance and suitability of the setup are illustrated by the study of the chlorine-initiated oxidation reaction of toluene in the atmospheric simulation chamber and in the fast flow tube. Stable products and reactive intermediates have been well-determined and their reaction dynamics are discussed.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.5135387
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 10
    Online Resource
    Online Resource
    Vacuum ultraviolet photodynamics of the methyl peroxy radical studied by double imaging photoelectron photoion coincidences
    AIP Publishing ; 2020
    In:  The Journal of Chemical Physics Vol. 152, No. 10 ( 2020-03-14)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 152, No. 10 ( 2020-03-14)
    Abstract: The vacuum ultraviolet photoionization of the methyl peroxy radical, CH3O2, and unimolecular dissociation of internal energy selected CH3O2+ cations were investigated in the 9.7–12.0 eV energy range by synchrotron-based double imaging photoelectron photoion coincidence. A microwave discharge flow tube was employed to produce CH3O2 via the reaction of methyl radicals (CH3) with oxygen gas. After identifying and separating the different sources of CH3+ from photoionization of CH3 or dissociative photoionization of CH3O2, the high resolution slow photoelectron spectrum (SPES) of CH3O2 was obtained, exhibiting two broad bands superimposed with a complex vibrational structure. The first band of the SPES is attributed to the X3A″ and a1A′ overlapped electronic states of CH3O2+ and the second is assigned to the b1A′ electronic state with the help of theoretical calculations. The adiabatic ionization energy of CH3O2 is derived as 10.215 ± 0.015 eV, in good agreement with high-accuracy theoretical data from the literature. The vertical ionization energy of the b1A′ electronic state is measured to be 11.5 eV and this state fully dissociates into CH3+ and O2 fragments. The 0 K adiabatic appearance energy (AE0K) of the CH3+ fragment ion is determined to be 11.15 ± 0.02 eV.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/5.0002109
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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