# Elasto-magnetic instabilities for amplified actuation and mechanical memory

## TL;DR

This paper introduces a new method using magnetic and elastic forces to create amplified motion and mechanical memory in soft systems.

## Contribution

The work presents a novel elasto-magnetic instability mechanism for programmable and adaptive soft actuation.

## Key findings

- The system produces amplified motion and greater displacement and force than a control system.
- The design principles can be applied to different configurations by balancing magnetic and elastic forces.
- The system exhibits inertial hysteresis for mechanical memory with adjustable thresholds.

## Abstract

Instabilities can generate fast and amplified motion in mechanical systems. Here, we present an elasto-magnetic instability that combines magnetic attraction and elastic tension to create bistable dynamics. To demonstrate this, we built a coupled elasto-magnetic vibration system that produces amplified motion and greater displacement and force than a control system across a wide frequency range. We also establish design principles that can be applied to different configurations by studying the balance between magnetic and elastic forces. The system also shows inertial hysteresis, which enables mechanical memory by storing external inputs in volatile and non-volatile modes with adjustable thresholds. This dual function of amplification and memory shows how instabilities can be potentially used for programmable and adaptive soft actuation.

Here the authors utilize magnetic attraction and elastic tension to create instabilities that amplify vibrations and induce inertia-driven hysteresis. The design enables efficient mechanical memory with both volatile and non-volatile modes.