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Updated: Mar 10, 2026

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
Novel multiferroic state and ME enhancement by breaking the AFM frustration in LuMn1-xO3
F G Figueiras1, D Karpinsky2, P B Tavares3
1Physics Department & CICECO-AIM, Aveiro University, 3810-193 Aveiro, Portugal. ffigueiras@ua.pt and IFIMUP and IN, Institute of Nanoscience and Nanotechnology, Dep de Física e Astronomia da Universidade do Porto, 4169-007 Porto, Portugal.
Abstract:
This study provides a comprehensive insight into the effects of controlled off-stoichiometry on the structural and multiferroic properties of the hexagonal manganite LuMn1-xO3+δ (x = 0.02; δ ∼ 0), supported by neutron powder diffraction measurements confirming single phase P63cm symmetry and evidencing a relevant ferromagnetic component, below TN ∼ 90 K, which breaks the archetypal geometrically frustrated antiferromagnetic state typically ascribed to LuMnO3. The perturbations in the triangular disposition of spins prompt an additional electric polarization contribution and a clear enhancement of the magnetoelectric coupling which are in good agreement with the results of first principles calculations. In addition, Raman spectroscopy, dielectric permittivity, pyroelectric current and magnetic measurements as a function of temperature point out the precursor effects of the magnetic phase transitions involving a strong coupling between spins, lattice and electric order, even above the Néel temperature.
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