Tunable magnetization dynamics in artificial spin ice via shape anisotropy modification

Artificial spin ice (ASI) is metamaterial whose properties are determined by the arrangement of nanomagnets rather than the material properties of which the elements are made. In this paper we explore how changing the size of the elements within the three sublattices that comprise the ASI affects the magnetisation dynamics and access to microstates with much simpler field protocols than is available in conventional ASI. We employed various characterisation techniques such as ferromagnetic resonance (FMR) to measure the dynamics, scanning electron microscopy (SEM) and atomic force microscopy (AFM) to determine the sample dimensions and quality as well as magnetic force microscopy (MFM) for microstate detection. Results and interpretations are also supported by micromagnetic simulations The research was in strong collaboration between UCL and Imperial in London and Kyushu University in Japan. Full Article…

Joshua Bailey

Being part of the CDT-ACM was an all-round fantastic experience; I not only received great training in a range of advanced characterisation techniques, but I also made strong links with industry and strong bonds with my cohort which have both led to fruitful collaborations.