Structure-Induced Positive Magnetoelastic Effect in Soft Systems for Voice Recognition
- Yin, Junyi
- Advisor(s): Chen, Jun J.C.
Abstract
The conventional magnetoelastic effect describes the variation in magnetic flux density of certain materials under mechanical pressure within the megapascal range. In this study, we introduce porous microstructures into a soft magnetic system, resulting in an enhanced magnetoelasticity, characterized by a counterintuitive increase in magnetic flux density with the application of subtle mechanical pressure. This phenomenon, termed the structure-induced positive magnetoelastic effect, is attributed to the stress-induced redistribution of micromagnets within the porous, soft system, which exhibits a low Young’s modulus and near-zero Poisson’s ratio behavior. The technological impact of this discovery is demonstrated in its application to acoustic sensing and voice recognition, overcoming the low-pressure detection limits of current platform technologies. This breakthrough holds substantial potential for ultrasensitive pressure detection, with wide-ranging applications in extracting subtle physiological information.