Figure 5
Logical NOT and NAND gates based on state-modulated SW transmission. (a) Diagram of the gate architecture. The left antenna is the SW source and the right antenna detects the output signal encoded into the SW strength. Logic input is encoded into the spin state of the gate’s arm. The notches at the ends of a gate arm are used to reduce SW reflection. (b) Logic-NAND operation and truth table. In each arm, the background spin state and corresponding SW distribution are shown together. Each arm is 300 nm long and 60 nm wide; the separation between the two arms is 40 nm. The frequency of the used spin wave is 10 GHz. Other separation values of 20, 60 and 80 nm were also examined in simulations to check if the dipolar coupling57 between the two arms will affect the operation of the NAND gate, and it was found that, for the chosen smallest separation 20 nm, the NAND gate can still work well.
