Fig. 6: Self-powered device demonstration.

a Traditional Morse telegraph model and code. b Working principle of the fiber-type MEG-based information transmission device. c Information transmission through Morse code using variations of current signals generated by the fiber-type MEG. d Integration of fibers into differently shaped systems: a knit fabric, pentagram shape, spiderweb design, and fibers with embedded “NPL” wording incorporated into yarn cloth. e Schematics of an action-potential-induced biological synapse and MEG-potential-powered artificial synaptic device. f Long-term potentiation (LTP) curves acquired at different pulse durations using one MEG unit. g, h LTP and long-term depression (LTD) curves obtained using one MEG unit. i, LTP and LTD plotted against the number of ulses powered by one MEG unit.