Abstract
Spin Waves (SWs) propagate through magnetic waveguides and interfere
with each other without consuming noticeable energy, which opens the
road to new ultra-low energy circuit designs. In this paper we build
upon SW features and propose a novel energy efficient Full Adder (FA)
design consisting of The FA 1 Majority and 2 XOR gates, which outputs
Sum and Carry-out are generated by means of threshold and phase
detection, respectively. We validate our proposal by means of MuMax3
micromagnetic simulations and we evaluate and compare its performance
with state-of-the-art SW, 22nm CMOS, Magnetic Tunnel Junction (MTJ),
Spin Hall Effect (SHE), Domain Wall Motion (DWM), and Spin-CMOS
implementations. Our evaluation indicates that the proposed SW FA
consumes 22.5% and 43% less energy than the direct SW gate based and
22nm CMOS counterparts, respectively. Moreover it exhibits a more than 3
orders of magnitude smaller energy consumption when compared with
state-of-the-art MTJ, SHE, DWM, and Spin-CMOS based FAs, and outperforms
its contenders in terms of area by requiring at least 22% less chip
real-estate.