Computing with Spin-Wave Solitons

Time: Tuesday, October 9th, 11:00

Speaker: Ferran MACIA, Universita de Barcelona

Collective magnetic excitations, such as spin waves are attracting a growing interest for their potential applications as memory and communication devices working at high frequency and low power. In particular the use of nanometer scale oscillators could lead to new types information processing, including neuromorphic computing. In this talk we will review some applications of spin-wave patterns created from Spin Torque Oscillators (STO) and their interactions with background oscillations [1-4]. Next, we will focus on solitonic modes that can be created in STO. First I will show that arrays of vortices can be described through the Kuramoto model, having patterns of synchronization resembling the patterns occurring in the brain [5]. Second, I will discuss some advances in the study of magnetic Droplet Solitons and Dynamical Skyrmions, which are magnetic excitations consisting of reversed oscillating spins that are strongly localized and can be controlled through the applied field and the spin current [6-9]. Droplet solitons are multistate oscillators with a hysteretic behavior making them good candidates as building blocks in neuromorphic computing

[1] F. Macià et al. Nanotechnology 22, 095301 (2011)
[2] F. Macià et al. Nanotechnology 25, 045303 (2014)
[3] F.C. Hoppensteadt, US Patent 9,582,695 (2018)
[4] F Hoppensteadt, Biosystems 136, 99-104 (2017)
[5] V. Flovick et al Scientific Reports, 6, 32528 (2016)
[6] S. M. Mohseni et al., Science 339, 1295 (2013)
[7] F. Macià et al. Nature Nanotech. (2014)
[8] J.Hang et al. Scientific Reports 8, 6847, (2018)
[9] N. Statuto et al. Nanotechnology, 29, 325302 (2018)