Skyrmions are nanosized magnetic whirls attractive for spintronic applications due to their innate stability.

They can emulate the characteristic behavior of various spintronic and electronic devices such as spin-torque

nano-oscillators, artificial neurons and synapses, logic devices, diodes, and ratchets. Here, we show that

skyrmions can emulate the physics of an RC circuit—the fundamental electric circuit composed of a resistor and

a capacitor—on the nanosecond time scale. The equation of motion of a current-driven skyrmion in a quadratic

energy landscape is mathematically equivalent to the differential equation characterizing an RC circuit: the

applied current resembles the applied input voltage and the skyrmion position resembles the output voltage at the

capacitor. These predictions are confirmed via micromagnetic simulations.We show that such a skyrmion system

reproduces the characteristic exponential voltage decay upon charging and discharging the capacitor under

constant input. Furthermore, it mimics the low-pass filter behavior of RC circuits by filtering high frequencies

in periodic input signals. Since RC circuits are mathematically equivalent to the leaky-integrate-fire (LIF) model

widely used to describe biological neurons, our device concept can also be regarded as a perfect artificial LIF

neuron.

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