Dipole coupled MQCA based efficient approximate nanomagnetic subtractor and adder design approach.

Abstract

In this paper, we propose a dipole coupled Magnetic Quantum-dot Cellular Automata based approximate nanomagnetic (APN) architectural design approach for subtractor and adder. In addition, we also introduce an APN architecture which offers runtime reconfigurability using single design layout comprising only 4 nanomagnets. Subsequently, we propose the APN add/sub architecture by exploiting shape anisotropy and ferromagnetically coupled fixed input majority gate. The proposed APN architecture designs have been implemented using micromagnetic simulation tool and performance have been compared with state-of-the-art resulting 50-80% reduction in the number of nanomagnets and clock cycles without degradation in the accuracy leading to area and energy efficiency.