Reconfigurable magnonic mode-hybridisation and spectral control in a bicomponent artificial spin ice

Abstract

Strongly-interacting nanomagnetic arrays are finding increasing use as model host systems for reconfigurable magnonics. The strong inter-element coupling allows for stark spectral differences across a broad microstate space due to shifts in the dipolar field landscape. While these systems have yielded impressive initial results, developing rapid, scaleable means to access abroad range of spectrally-distinct microstates is an open research problem.We present a scheme whereby square artificial spin ice is modified by widening a ‘staircase’ subset of bars relative to the rest of the array, allowing preparation of any ordered vertex state via simple global-field protocols. Available microstates range from the system ground-state to high-energy ‘monopole’ states, with rich and distinct microstate-specific magnon spectra observed. Microstate-dependent mode-hybridisation and anticrossings are observed at both remanence and in-field with dynamic coupling strength tunable via microstate-selection. Experimental coupling strengths are found up to g/2π = 0.15 GHz. Microstate control allows fine mode-frequency shifting, gap creation and closing, and active mode number selection

Chiral magnonic resonators: Rediscovering the basic magnetic chirality in magnonics

“…One does not need to stick to one dimensional (1D) designs, such as finite resonators on 1D stripe waveguides 15,16 and infinitely long resonators on thin film media. Instead, one could form 2D systems (which could be periodic 41,[78][79][80] or irregular) of finite resonators e.g. on continuous thin films of YIG (Fig.…”

“…8), thereby avoiding loss due to edge roughness, and master diffraction as a means of spin wave control. 81,82 As an example, artificial spin ices [78][79][80] on YIG would represent a promising object for investigation.…”