Category: Papers

Congratulations to Varun who just published his first paper in Phys. Rev. B 111, 184412 (2025). In this work, we investigated the effect of the nanomagnet’s shape on the ferromagnetic resonance of artificial spin ices.

These results demonstrate the relevance of edge modes as nanomagnets transition from a rectangular (P=0) to an elliptical (P-=1) cross section.

Special thanks to P. Schiffer who introduced us to this topic. Their paper on the effect of shape on the magnetization states is a companion article at Phys. Rev. B 111, 184420 (2024)

Congratulations to Medhanie who published a paper on the interaction between solitons mediated by spin superfluids in Phys. Rev. B. In this study, we nucleated metastable solitons by spin injection. The region between these solitons is a “well” in which a spin superfluid is established. Depending on the relative sign of the initial soliton, the interaction leads to the ejection and renucleation of solitons under the injection region outside or inside of the well.

This work is another step towards the understanding of spin superfluids and their interaction with nonlinear structures.

The first demonstration of polarization transient gratings has been published in Nature Communications. Congratulations to Laura Foglia and the extraordinary experimental team behind this achievement.

Congratulations to Matt Copus too who completed the extension of the pseudospectral model to 2D and was able to model the spectral response of polarization transient gratings. This work opens new possibilities for the pseudospectral model in the ultrafast regime.

Congratulations to Medhanie who published his work on spin hydrodynamics on Phys. Rev. B 110, 174424 (2024). This work shows that a rather special solution called a contact soliton dissipative exchange flow can be modulated by spin injection, in turn pumping magnons into the ferromagnetic channel.

This work also extended our pseudospectral Landau-Lifshitz model with spin transfer torque and demonstrated the importance of correctly manage the exchange energy when solitons are present in the system due to their sharp domain walls.

Congratulations to Ghanem and Ally who published a joint paper in the semi-analytical and numerical investigation of 3D artificial spin ices. This work is the first to explore this challenging geometry from two numerical perspectives.

This work shows not only the advantages but also the issues that different models present when exploring 3D geometries.

Our collaborative work on 3D artificial spin ices was just published on Nature Communications. The work combines very nice experimental work lead by Imperial College London as well as numerical simulations, Brillouin light scattering, and calculations using our in-house semi-analytical code Gænice.

We obtained very good agreement with experiments by combining our method to numerical estimate diagonalized demag factors and semi-analytical FMR calculations. This work demonstrated Gænice’s application to 3D spin ice geometries.

We have published a new continuum method that resolves atomic-scale magnetization dynamics with good accuracy. The method is pseudospectral and so is amenable to analytical calculation. Limiting cases of modulational instability (a long-wave phenomenon) and transient grating (a regime where long and short waves co-exist) were resolved in excellent agreement with atomistic spin dynamics. We expect this model to be the foundational stone for a better modeling of topological textures.

Fantastic work by Kyle Rockwell on this research and special thanks to our international collaborators Joel Hirst and Thomas Ostler.