Spin dynamics modulated by collective magnetization reversal in artificial spin ice*

Magnon spintronics aims at developing novel functional devices that combine magnonic and electronic spin transport phenomena. In particular, magnetic metamaterials such as artificial spin ice and magnonic crystals offer unique possibilities in magnon spintronics \footnote{M. B. Jungfleisch et al., Phys. Rev. B 93, 100401(R) (2016).} We recently demonstrated the detection of Oersted-field driven spin dynamics in connected artificial spin-ice networks made of bilayer Ni₈₀Fe₂₀/Pt with different lattice parameters by dc electrical means \footnote{M. B. Jungfleisch et al., Appl. Phys. Lett. 108, 052403 (2016).}.
Here, we show spin-torque ferromagnetic resonance in square artificial spin-ice systems and correlate our observations to magnetotransport studies in those type of networks \footnote{M. B. Jungfleisch et al., arXiv:1710.10534 (2017).}. The experimental findings are described using a simulation approach that highlights the importance of the correlated dynamics response of the magnetic system. Our results open the possibility of designing reconfigurable microwave oscillators and magnetoresistive devices based on connected networks of nanomagnets.