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Applied Physics Letters Collection


 
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Applied Physics Letters : Gunn oscillations in a self-switching na...

By: K. Y. Xu, G. Wang, and A. M. Song

Description: The feasibility of Gunn oscillations in a planar nanoscale unipolar diode or a self-switching device (SSD) is analyzed using Monte Carlo simulations. The asymmetric nanochannel that the SSD is based on is shown to induce charge domains much more receptively when compared to a reference symmetric nanochannel. The oscillation frequency reaches 130 GHz. Potential applications are discussed in terms of the ease of heat dissipation and generation of oscillations ...

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Applied Physics Letters : Vertically aligned liquid crystals on a ...

By: Hong-Gyu Park, Young-Hwan Kim, Byeong-Yun Oh, Won-Kyu Lee, Byoung-Yong Kim et al

Description: Using ion-beam (IB) irradiation, liquid crystals (LCs) were vertically aligned (VA) on a γ-Al2O3 alignment film. Atomic-layer deposition was used to orient the LCs on high-quality γ-Al2O3 alignment films. The LC molecule orientation indicates the vertical direction of the atomic-layer-deposited γ-Al2O3 alignment films. X-ray photoelectron spectroscopy showed that IB irradiation changed the chemical structure, shifting the Al–O binding energy and altering the...

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Applied Physics Letters : Enhanced field emission from ZnO nanotet...

By: Chi Li, Kai Hou, Xiaxi Yang, Ke Qu, Wei Lei et al

Description: Field emission properties of screen-printed ZnO nanotetrapods on a carbon nanofiber buffered Ag electrode were studied. The turn-on electric field (at a current of 0.1 μA/cm2) and maximum emission current are 0.6 V/μm and 2.8 mA/cm2 (at a field of 2.2 V/μm), which were significantly improved compared to the control device made of ZnO nanotetrapods on Ag directly without a carbon nanofiber buffer. The improved field emission is due to the better contact (both...

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Applied Physics Letters : Growth and magnetic control of twinning ...

By: C. A. Jenkins, R. Ramesh, M. Huth, T. Eichhorn, P. Pörsch et al

Description: Twin structure engineering in sputtered films close to the Heusler stoichiometry Ni2MnGa (001) is used to demonstrate temperature and magnetic control of the phase transformation behavior. A custom heating apparatus integrated with a commercial microscope allows the observation of the austenite-martensite transition in epitaxially clamped films. Intermartensitic twin boundaries on cantilevers released from the epitaxial strain by focused ion beam etching are...

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Applied Physics Letters : Reversible photoswitching behavior in bu...

By: Rahima Khaton, Shin-ichiro Kashiwagi, Toshifumi Iimori, and Nobuhiro Ohta

Description: A photoinduced reversible change in bulk resistance of polycrystalline AgI is observed at room temperature. The original yellow color of the sample changes to dark brown with UV (308 nm) photoirradiation, associated with the small decrease in the bulk resistance. A reversible switching of color between dark brown and yellow is observed by alternative UV-visible photoirradiation, associated with a switching between high and low resistance states. The observed...

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Applied Physics Letters : Acceleration insensitive encapsulated si...

By: C. M. Jha, J. Salvia, S. A. Chandorkar, R. Melamud, E. Kuhl et al

Description: This paper presents the acceleration sensitivity and the resulting vibration-induced phase noise of an electrostatically coupled encapsulated silicon microresonator. External vibrations can produce phase noise in microresonators by generating time-varying stress in the resonant beams. A spring mounted resonator design that reduces the induced axial stress is presented here. Measurements and simulations show that the acceleration sensitivity and the vibration...

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Applied Physics Letters : Thermal sintering of solution-deposited ...

By: Heng Pan, Seung H. Ko, and Costas P. Grigoropoulos

Description: Low-temperature sintering of metal nanoparticle inks is a promising technique in realizing large area and flexible electronics. It is demonstrated in this letter that spectroscopic ellipsometry in the spectral region of 0.75–3.5 eV can be employed to characterize the sintering process manifested by the evolution of film thickness, effective dielectric function, and percolation transition. A two-oscillator model can be used to model the effective dielectric f...

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Applied Physics Letters : Optimal design of miniaturized thin-film...

By: Jiwen Zhu, Tong Hao, Christopher J. Stevens, and David J. Edwards

Description: This paper investigates the optimal miniaturization of a helical resonator, which is in the form of a two turn helix. We theoretically demonstrate that its outmost dimension can be reduced to below 1% of the free space wavelength at resonance. Maximum miniaturization is achieved at an optimal metallic fill ratio of around 0.2 independent of diameter. Simulation and experimental results were used to validate the theoretical model and explore the miniaturizati...

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Applied Physics Letters : Efficient readout of micromechanical res...

By: W. J. Venstra and H. S. J. van der Zant

Description: We present a method for efficient spectral readout of mechanical resonator arrays in dissipative environments. Magnetomotive drive and detection are used to drive double clamped resonators in the nonlinear regime. Resonators with almost identical resonance frequencies can be tracked individually by sweeping the drive power. Measurements are performed at room temperature and atmospheric pressure. These conditions enable application in high throughput resonant sensor arrays.

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Applied Physics Letters : Coupling of nitrogen-vacancy centers in ...

By: K.-M. C. Fu, C. Santori, P. E. Barclay, I. Aharonovich, S. Prawer et al

Description: The optical coupling of guided modes in a GaP waveguide to nitrogen-vacancy (NV) centers in diamond is demonstrated. The electric field penetration into diamond and the loss of the guided mode are measured. The results indicate that the GaP-diamond system could be useful in realizing coupled microcavity-NV devices for quantum information processing in diamond.

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Applied Physics Letters : Probing antiphase boundaries in Fe3O4 th...

By: Shailja Tiwari, D. M. Phase, and R. J. Choudhary

Description: We present Raman study of Fe3O4 films of different thicknesses grown on single crystal Si and MgO substrates to investigate the presence of antiphase boundaries (APBs). X-ray diffraction and x-ray photoelectron spectroscopy measurements indicate that films are single phase Fe3O4 on both the substrates. The changes in frequency and linewidth of different Raman modes [A1g and T2g(3)] are monitored and the electron-phonon coupling parameter (λ) is computed. λ i...

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