Design and evaluation of clocked nanomagnetic logic conservative Fredkin gate

Nanomagnetic logic (NML) has recently been proposed as an attractive and promising implementation of QCA and also as a possible alternative to the CMOS technology. With this emerging technology, it is possible to process and store binary information according to the magnetization state of nanomagnets. Similar to other nanotechnologies, NML circuits are also sensitive to fabrication variations and thermal fluctuations. Therefore, it is highly consequential to improve the testability of these circuits. Circuits based on conservative logic inherently enhance test performance. In this paper, the Fredkin gate, which is one of the most famous conservative reversible gates has been designed and simulated in NML by considering the physical properties of nanomagnets. It can be used to design other testable and ultra-low-power NML circuits as well. OOMMF physical simulation tool is used to simulate and validate the proposed gate at room temperature. The results indicate the correct functionality of the design.