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ACS Nano. 2017 Aug 22;11(8):7781-7789. doi: 10.1021/acsnano.7b01475. Epub 2017 Jul 24.

Nanomechanical Encoding Method Using Enhanced Thermal Concentration on a Metallic Nanobridge.

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National NanoFab Center (NNFC) , 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.


We present a fast, energy-efficient nano-thermomechanical encoding scheme for digital information storage and retrieval. Digital encoding processes are conducted by the bistable electrothermal actuation of a scalable nanobridge device. The electrothermal energy is highly concentrated by enhanced electron/phonon scattering and heat insulation in a sub-100 nm metallic layer. The efficient conversion of electrothermal energy into mechanical strain allows digital switching and programming processes within 60 ns at 0.75 V with a programming energy of only 54 pJ. Furthermore, this encoding scheme together with the thermally robust design enables data retention at temperatures up to 400 °C. These results suggest that the proposed nano-thermomechanical encoding method could contribute to low-power electronics and robust information storage/retrieval systems.


NEMS; Wiedemann−Franz law; high temperature; joule heating; low-voltage electrothermal actuation; nano-electromechanical system; nanomechanical encoding; nonvolatile memory


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