Category: Papers

Our work to numerically solve for magnetostatic waves within the pseudospectral Landau-Lifshitz (PS-LL) model was just published in npj Computational Materials.

While the PS-LL model was initially developed to resolve the transition from atomic to continuum dynamics, its general formulation allows for the use of any kernel. Here, we use a magnetodipolar kernel that can represent in-plane magnetostatic waves, both backward volume and surface. We demonstrate that the use of this kernel can speed up simulations by a factor of two at the expense of losing the particularities of the magnetization distribution at physical edges.

Our work on the reconfigurability and dynamics of symmetry-broken magneto-toroidal artificial spin ices was just published in Phys. Rev. B.

Using both Mumax3 modeling and Gaenice, we determined the symmetry-broken resonance as a function of the magnetization states for this configuration. We also demonstrated that the coupling is too weak for the modes to exhibit any interesting effect related to long range toroidization.

Congratulations to Ally who published her work on reconfigurable nanomagnonic heterojunctions in Phys. Rev. Applied! This work is a collaboration with Pietro Micaletti, who visited our group, and his advisor Federico Montoncello at the University of Ferrara.

By using a nanomagnonic crystal, we investigated how to tune its band structure with an external magnetic field. The result is an analog to heterojunctions, where the band structure becomes staggered. A dynamic control of the band misalignment allowed us to produce a nonlinear magnon envelope: a soliton train. The spectrum of such a train is a frequency comb, demonstrating a nonlinear modulation of magnons by a simple field protocol.

Congratulations to Kyle who published a first-author paper on the use of fractional calculus to solve partial differential equations with complex non-local kernels.

More details can be found in our open access publication Phys. Scr. 100, 075266 (2025)

Congratulations to Lawrence who published his work on wave dynamics in a macroscopic artificial spin ice. In this work, we found the dispersion relation is the array as well as the impact of a domain boundary on the dynamics in Phys. Rev. Applied.

Upon nonlinear excitation, the mechano-magnetic waves can scatter into a localized mode at the domain boundary or domain wall.

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.