SPICE Workshop on Ferrons and Magnons: friends or foes? July 7th - 9th, 2026
Fiona Sosa, WMI
Spintronics is governed by the transfer of angular momentum between electrons and solid-state excitations such as magnons and phonons. In our recent work, we demonstrate angular momentum transfer between two ferromagnetic strips patterned on diamagnetic substrates [1] and discuss two potential mechanisms, namely transfer via dipolar coupling or via substrate phonon-mediated transport between the magnonic excitations in the strips. Further experiments show that angular momentum transport becomes supressed when removing the connecting substrate underneath the strip electrodes, which we realize via freestanding structures. This indicates that the transport relies on the presence of a substrate, suggesting that phonons contribute to the transport. Building on these findings, we are currently exploring whether angular momentum transport is affected when substituting the dielectric insulator substrate with a ferroelectric substrate. This would allow to identify possible additional contributions related to the substrate’s electric polarization [2]. Here, we present our first experiments on angular momentum transport between two Permalloy strips on a LiNbO3 substrate and compare it with our results on dielectric substrates.
[1] R. Schlitz et al., Phys. Rev. Lett. 132, 256701 (2024).
[2] K. Shen et al., arXiv:2505.24419 (2025).