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Extended Data Fig. 9 | Propagation delay time for DW logic. a, Schematic
showing the use of the propagation delay time to improve the operational
reliability of logic operation in a NAND gate. Green and purple correspond to
⊙ and ⊗ magnetization, respectively. b, MFM images of NAND gates with
different input racetrack lengths (top, la = lb; middle, la > lb; bottom, la < lb; where
la and lb represent the racetrack lengths of input a and b, respectively). The
bright and dark regions correspond to ⊙ and ⊗ magnetization, respectively.
The MFM images are captured after saturation with an OOP magnetic field to
set the initial magnetization direction to ⊙ in all of the reservoirs, followed by
application of current pulses to obtain the final states. The direction of the
current f low is indicated. c, Schematic showing the dependence of the
probability of giving a correct output as a function of propagation delay time.
All the scale bars in the MFM images are 500 nm.