Skyrmion Stochastic Dynamics for Novel Computing Architectures

Using the instabilities and stochastic behavior of skyrmions, new computing architectures, e.g., neuromorphic, probabilistic and reservoir computing can be achieved [1-3]. The major aspect of this computation is understanding synaptic response and having a constant uncorrelated signal [2]. In this study, the stochastic property in a shuffling chamber is investigated using micromagnetic simulations. In particular, the temperature response to the number of skyrmions in a chamber is analyzed. Our study explored skyrmion dynamics under different geometries, constant temperatures, grains and different currents to get a stochastic skyrmion motion. Then, two locations, along the path of the skyrmions were chosen for local laser spot heating, keeping grain, current density and geometry constant. Finally, for constant temperatures, synaptic response is shown. This study will provide guidelines for the creation of a better probabilistic computing device and artificial synapse.

 

[1]       K.M. Song, J.S. Jeong, B.Pan et al., Nature Electronics 3, 148 (2020)

[2]       D. Pinna, F.A. Araujo, J.V. Kim et al., Physical Review Applied 9, 064018 (2018)

[3]       J. Zázvorka, F. Jakobs, D. Heinze et al., Nature nanotechnology 14, 658 (2019)