Emergent spin dynamics enabled by lattice interactions in a bicomponent artificial spin ice

TL;DR

This paper demonstrates how lattice interactions in a bicomponent artificial spin ice enable emergent spin dynamics, revealing unique spectra and inter-lattice interactions, with potential applications in nanomagnonics.

Contribution

It introduces a novel approach to modulate spin-wave properties using two dissimilar ferromagnetic metals arranged on a lattice, advancing the understanding of spin dynamics in artificial spin ice.

Findings

Distinct spectra for each sublattice observed.

Inter- and intra-lattice dynamics confirmed.

Material combination enables new nanomagnetic structures.

Abstract

Artificial spin ice (ASI) are arrays on nanoscaled magnets that can serve both as models for frustration in atomic spin ice as well as for exploring new spin-wave-based strategies to transmit, process, and store information. Here, we exploit the intricate interplay of the magnetization dynamics of two dissimilar ferromagnetic metals arranged on complimentary lattice sites in a square ASI to effectively modulate the spin-wave properties. We show that the interaction between the two sublattices results in unique spectra attributed to each sublattice and we observe inter- and intra-lattice dynamics facilitated by the distinct magnetization properties of the two materials. The dynamic properties are systematically studied by angular-dependent broadband ferromagnetic resonance and confirmed by micromagnetic simulations. We show that the combination of materials with dissimilar magnetic properties enables the realization of a wide range of two-dimensional structures potentially opening the door to new concepts in nanomagnonics.