Tuning of Channel Conductance of Au Nanowires Using Ultrafast Electromigration Controlled by a Field-Programmable Gate Array
Tuning of Channel Conductance of Au Nanowires Using Ultrafast Electromigration Controlled by a Field-Programmable Gate Array
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利用现场可编程门阵列控制的超快电迁移调节金纳米线的沟道电导
DOI：
10.1109/3m-nano.2015.7425485
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
T. Saito and J. Shirakashi
中科院分区：
文献类型：
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作者：
Y. Katogi;Y. Kanamaru;S. Sato;T. Saito and J. Shirakashi
反馈控制电迁移（FCE）已被用于控制具有量子化电导的金属纳米线并产生纳米间隙。然而，使用基于微处理器的控制器和通用操作系统（GPOS）的传统FCE程序形成纳米结构是一个相当缓慢的过程。因此，我们提出了一种使用现场可编程门阵列（FPGA）的超快速FCE方法来立即精确控制金纳米线的沟道电导。本文利用基于fpga的恒压（CV）控制系统，研究了超快FCE对金纳米线量子化电导的调谐。首先，在FCE过程中，设定Au纳米线量子化电导的预设值为25 G0、15 G0和5 G0（G0= 2e2/h）。在FCE过程中，金纳米线的电导逐渐减小，直到在一毫秒数量级内达到预设值。此外，通过CV程序精确控制了金纳米线的量子化电导平台，预设值为15 G0和5 G0。这些结果表明，结合FCE和CV程序以及基于fpga的控制系统可以精确稳定地调整金纳米线的沟道电导，并达到毫秒级的分辨率。
Feedback-controlled electromigration (FCE) has been employed to control metal nanowires with quantized conductance and to create nanogaps. However, the formation of nanostructures by conventional FCE procedure using a microprocessor-based controller with a general purpose operating system (GPOS) is considerably slow process. Therefore, we proposed an ultrafast FCE method using a field-programmable gate array (FPGA) to immediately and precisely control the channel conductance of Au nanowires. In this report, we study the tuning of quantized conductance of Au nanowires by ultrafast FCE using FPGA-based control system with a constant-voltage (CV) method. First, in the FCE procedure, preset values of quantized conductance of Au nanowires were defined as 25 G0, 15 G0, and 5 G0(G0= 2e2/h). The conductance of the Au nanowires during FCE procedure decreased until the conductance reached the preset values within an order of a millisecond. Furthermore, the quantized conductance plateaus of the Au nanowires were precisely controlled by the CV procedure with the preset values of 15 G0and 5 G0. These results imply that the combination of FCE and CV procedures with FPGA-based control system can precisely and stably tune the channel conductance of Au nanowires with millisecond-scale resolution.