# Biocompatible Magnetopyroelectric Composite Films for Cell Stimulation

## TL;DR

Researchers developed a biocompatible material that uses magnetic fields to generate heat and electric signals, safely promoting nerve cell growth and offering new possibilities for medical treatments.

## Contribution

A heat-mediated magnetoelectric approach using biocompatible iron oxide nanoparticles and pyroelectric polymers is introduced for safer biomedical applications.

## Key findings

- Composite films using iron oxide nanoparticles and P(VDF-TrFE) generate pyroelectric currents via alternating magnetic fields.
- The material enhances neuronal differentiation of neural progenitor cells through AKT and calcium signaling pathways.
- The approach is free of heavy metals and shows excellent biocompatibility.

## Abstract

Magnetoelectric materials, which generate electric fields in response to alternating magnetic stimulation, are increasingly recognized for their applications in neuromodulation, tissue engineering, wireless drug delivery, and cancer treatment. This study addresses the cytotoxicity concerns associated with heavy metals in traditional magnetoelectric composites by introducing a heat‐mediated magnetoelectric approach utilizing biocompatible iron oxide nanoparticles and pyroelectric polymers, thereby enhancing biomedical safety. The nanoparticles were synthesized with controlled size and shape via thermal decomposition of iron oleate, employing an in situ temperature labeling technique that simplifies the synthesis process and ensures uniform particle formation. These nanoparticles, optimized for high heating efficiency, were combined with the pyroelectric polymer P(VDF‐TrFE) to create composite films that exhibit a heat‐mediated magnetoelectric effect. This effect involves an alternating magnetic field heating the nanoparticles, leading to reversible material depolarization and the generation of a pyroelectric current. We explored the magnetopyroelectric effect on cell differentiation, demonstrating excellent biocompatibility with neural progenitor cells and significant enhancement in neuronal differentiation, attributed to the synergistic effects of heat and electricity. The pro‐differentiation mechanism of magnetopyroelectric stimulation involves phosphatidylinositol 3 kinase AKT pathway and calcium signaling. This heat‐mediated magnetoelectric approach not only presents a potential for applications such as neuronal repair and targeted drug delivery but also provides a safer and more versatile alternative to conventional magnetoelectric materials.

Magnetopyroelectric films couple Fe3O4 nanoparticles with pyroelectric P(VDF‐TrFE) to turn alternating magnetic fields into controlled heat and pyroelectric currents. This heavy‐metal free platform safely boosts neural progenitor cells differentiation via synergistic thermal and pyroelectrical cues, engages AKT and calcium pathways, and opens practical routes for neuromodulation and targeted delivery.