Ultrafast transient dynamics in composite multiferroics

TL;DR

This paper theoretically explores ultrafast dynamics in composite multiferroics, revealing how photo-induced strains influence magnetic and electric states within picoseconds, with implications for high-speed electronic devices.

Contribution

It introduces a theoretical analysis of ultrafast multiferroic responses considering two distinct magnetoelectric mechanisms, highlighting their roles in rapid state changes.

Findings

Strain-mediated effects cause demagnetization and depolarization within tens of picoseconds.

Charge-mediated interactions influence magnetization recovery.

Potential for high-speed, multi-state electronic device applications.

Abstract

We investigate theoretically the dynamic multiferroic response of coupled ferroelectric/ferromagnetic composites upon excitation by a photo-induced acoustic strain pulse. Two magnetoelectric mechanisms are considered: interface strain- and charge-mediated magnetoelectric couplings. The former results in demagnetization, depolarization and repolarization within tens of picoseconds via respectively magnetostriction and piezoelectricity. Charge magnetoelectric interaction affects the ferroelectric/ferromagnetic feedback response leading to magnetization recovery. Experimental realization based on time-resolved x-ray diffraction is suggested. The findings indicate the potential of composite multiferroics for photo-steered, high-speed, multi-state electronic devices.