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27 Jun 2011

Volume 98, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 98, 263101 (2011); http://dx.doi.org/10.1063/1.3587576 (3 pages)

Jing Ye, Yu Zhao, Libin Tang, Li-Miao Chen, C. M. Luk, S. F. Yu, S. T. Lee, and S. P. Lau
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Improved endurance of resistive switching TiO2 thin film by hourglass shaped Magnéli filaments

Gun Hwan Kim, Jong Ho Lee, Jun Yeong Seok, Seul Ji Song, Jung Ho Yoon, Kyung Jean Yoon, Min Hwan Lee, Kyung Min Kim, Hyung Dong Lee, Seung Wook Ryu, Tae Joo Park, and Cheol Seong Hwang

Appl. Phys. Lett. 98, 262901 (2011); http://dx.doi.org/10.1063/1.3600784 (3 pages) | Cited 5 times

Online Publication Date: 27 June 2011

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A modified biasing scheme was adopted to improve the electrical endurance characteristics of conducting filamentary resistive switching (RS) in a Pt/TiO2/Pt RS cell. The modified bias scheme included the application of bias voltages with alternating polarity, even though RS proceeds in non-polar mode, which results in the stable distribution of each resistance states as well as improved endurance. This was attributed to the minimized consumption of oxygen ions in the TiO2 film, which can be induced by the formation of hourglass-shaped conducting filament (HSCF). The presence of a HSCF was confirmed by high-resolution transmission electron microscopy.
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73.40.Ns Metal-nonmetal contacts
73.61.-r Electrical properties of specific thin films
68.37.Og High-resolution transmission electron microscopy (HRTEM)
72.60.+g Mixed conductivity and conductivity transitions

3.4 GHz composite thin film bulk acoustic wave resonator for miniaturized atomic clocks

Alvaro Artieda and Paul Muralt

Appl. Phys. Lett. 98, 262902 (2011); http://dx.doi.org/10.1063/1.3603944 (3 pages)

Online Publication Date: 28 June 2011

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Triple layer SiO2/AlN/SiO2 composite thin film bulk acoustic wave resonators (TFBARs) were studied for applications in atomic clocks. The TFBAR’s were tuned to 3.4 GHz, corresponding to half the hyperfine splitting of the ground state of rubidium 87Rb atoms. The quality factor (Q) was equal to 2300 and the temperature coefficient of the resonance frequency fr amounted to 1.5 ppm/K. A figure of merit Qfr of ∼ 0.8 × 1013 Hz and a thickness mode coupling factor of 1% were reached. Such figures are ideal for frequency sources in an oscillator circuit that tracks the optical signal in atomic clocks.
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43.58.Kr Spectrum and frequency analyzers and filters; acoustical and electrical oscillographs; photoacoustic spectrometers; acoustical delay lines and resonators
06.30.Ft Time and frequency
06.20.F- Units and standards

Nuclear magnetic resonance study of the superprotonic conduction in LiH2PO4

Jin Jung Kweon, Kyu Won Lee, Cheol Eui Lee, and Kwang-Sei Lee

Appl. Phys. Lett. 98, 262903 (2011); http://dx.doi.org/10.1063/1.3605245 (3 pages) | Cited 1 time

Online Publication Date: 28 June 2011

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Superprotonic conduction in the LiH2PO4 system has been studied by means of high-resolution nuclear magnetic resonance measurements, which enabled us to distinguish dynamics of the two different hydrogen bonds in the structure. The protonic motion, primarily associated with the longer hydrogen bond, rather than the Li ionic motion, was revealed to dictate the extraordinarily high electrical conductivity of the system.
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76.60.Es Relaxation effects
77.84.Bw Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.
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