Fig. 2: Field-cycling-dependent spin-wave spectra as a physical reservoir.

a, Schematic of the temperature phase diagram for the bulk crystal Cu₂OSeO₃. The yellow dashed vertical (horizontal) line indicates the experimental conditions for our cycling experiments shown in c (d). b, The cycling number dependence of the spin-wave spectra in Cu₂OSeO₃ for H_c = 60 mT and 4 K. The evolution of the skyrmion-phase spectrum is shown for increasing values of N. Grey lines are added as a guide to the eye to keep track of the skyrmion modes. c, H_c dependence of the spin-wave spectra in Cu₂OSeO₃ for 4 K after 920 field cycles. d, Temperature dependence of the spin-wave spectra for H_c = 60 mT after 920 field cycles. e, Microwave absorption spectra as a function of f and N for different values of H_c at T = 4 K (upper row) and 35 K (lower row). The input signal in all plots is a sine wave with H_range = 90 mT.