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Mechanical pressure controls the structural, electric, and magnetic order insolid state systems, allowing to tailor and improve their physical properties.A well-established example is ferroelastic ferroelectrics, where the couplingbetween pressure and the primary symmetry breaking order parameter enableshysteretic switching of the strain state and ferroelectric domain engineering.Here, we study the pressure-driven response in a non-ferroelasticferroelectric, ErMnO3, where the classical stress-strain coupling is absent,and the domain formation is governed by creation-annihilation processes oftopological defects. By annealing ErMnO3 polycrystals under variable pressuresin the MPa-regime, we transform non-ferroelastic vortex-like domains intostripe-like domains. The width of the stripe-like domains is determined by theapplied pressure as we confirm by three-dimensional phase field simulations,showing that pressure leads to highly oriented layer-like periodic domains. Ourwork demonstrates the possibility to utilize mechanical pressure for domainengineering in non-ferroelastic ferroelectrics, providing aprocessing-accessible lever to control their dielectric, electromechanical, andpiezoelectric response.

Pressure-control of non-ferroelastic ferroelectric domains in ErMnO3