Recent advances in hard-magnetic soft composites: Synthesis, characterisation, computational modelling, and applications

TLDR

Hard‑magnetic soft composites are magneto‑active polymers containing hard‑magnetic particles, and recent progress driven by controllable ferromagnetic patterning during manufacturing has enabled programmable smart components for biomedical engineering and soft robotics. This review surveys the state of the art of MAPs, summarizing key fundamentals and seminal references. It outlines current synthesis and experimental characterization techniques, multiscale computational modeling approaches, and detailed potential applications. The authors conclude with a discussion of future perspectives for the field.

Abstract

Hard-magnetic soft composites consist of magneto-active polymers (MAPs) where the fillers are composed of hard-magnetic (magnetically polarised) particles. These novel multifunctional materials are experiencing a great advance from the last few years. This rise has been motivated by the possibility of controlling ferromagnetic patterns during the manufacturing process. Thus, structures with programmable functionalities can be conceptualised and implemented, opening new routes into the design of smart components with great opportunities in the biomedical engineering and soft robotics fields. In this work, we provide an overview of the state of the art of such MAPs, providing the key fundamentals and reference works. To this end, we present the current synthesis and experimental characterisation methods, the different computational modelling approaches across scales, and a detailed presentation of their current potential applications. Finally, we provide an overall discussion on future perspectives.