Flexible strained membranes of multiferroic TbMnO3

TL;DR

This study reports the fabrication and characterization of flexible, freestanding TbMnO3 membranes, demonstrating strain-tunable multiferroic properties suitable for flexible electronic applications.

Contribution

We developed elastic TbMnO3 membranes with controlled orientation and strain, enabling manipulation of multiferroic states in flexible devices.

Findings

Strain shifts Mn-O bond vibrational modes to lower energy.

Membranes exhibit bulk-like lattice parameters with suppressed twinning.

Strain influences the multiferroic state and polarization orientation.

Abstract

The multiferroic properties of TbMnO3 demonstrate high versatility under applied pressure, making the material potentially suitable for use in flexible electronics. Here, we report on the preparation of elastic freestanding TbMnO3 membranes with dominant (001) or (010) crystallographic out-of-plane orientation. Membranes with thickness of 20 nm display orthorhombic bulk-like relaxed lattice parameters with strong suppression of twinning for the (010) oriented membranes. Strain in flexible membranes was tuned by using a commercial strain cell device and characterized by Raman spectroscopy. The B1g out-of-phase oxygen-stretching mode, representative for the Mn-O bond distance, systematically shifts to lower energy with increasing strain (epsilon{max} ~ 0.5 %). The flexibility and elastic properties of the membranes allow for specific manipulation of the multiferroic state by strain, whereas the choice of the crystallographic orientation gives possibility for an in- or out-of-plane electric polarization.