| Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2016) | |
| Nanomaterials | Tuesday Sessions |
| Session NM-TuM |
| Session: | Nanofabrication and Nanodevices I |
| Presenter: | Noriaki Numakura, Tokyo University of Agriculture & Technology, Japan |
| Authors: | N. Numakura, Tokyo University of Agriculture & Technology, Japan Y. Iwata, Tokyo University of Agriculture & Technology, Japan J. Shirakashi, Tokyo University of Agriculture & Technology, Japan |
| Correspondent: | Click to Email |
Feedback-controlled electromigration (FCE) has been used as a useful technique for fabricating quantum point contacts (QPCs) and nanogaps [1]. The conventional FCE method is performed on a general-purpose operating system (GPOS). In contrast, real-time operating system (RTOS) is specifically designed to run applications with precise timing and reliability. Hence, we have previously reported the FCE method using RTOS, in order to run FCE algorithms time-deterministically and to control quantized conductance of Au nanowires, at room temperature in ambient air [2]. In this report, we propose a new FCE system with automatically optimized parameters for the improvement of control performance of FCE using RTOS.
In this system, we designed the FCE algorithms with randomly varying parameters. First, FCE experiments for the Au nanowires were repeatedly performed to obtain various FCE experimental data. Then, the FCE parameters were evaluated using cost functions, and stored in a database. Finally, we performed the FCE experiments with a suitable set of evaluated FCE parameters, which was generated using the stored data. As a result, the conductance of Au nanowire was successfully quantized and decreased without catastrophic break. Therefore, it is considered that the FCE system based on automatically optimized parameters can show the conductance quantization of Au nanowires even at room temperature in ambient air.
References
[1] D. R. Strachan, D. E. Smith, D. E. Johnston, T.-H. Park, M. J. Therien, D. A. Bonnell, and A. T. Johnson, Appl. Phys. Lett. 86, 043109 (2005).
[2] S. Sato, Y. Kanamaru, Y. Katogi and J. Shirakashi, 43rd International Conference on the Physics and Chemistry of Surfaces and Interfaces (PCSI-43), Mo0950, January 17-21, 2016, Palm Springs, CA, USA.