Interaction of multiferroic properties and interfaces in hexagonal LuMnO3 ceramics
authors Baghizadeh, A; Vieira, JM; Stroppa, DG; Vaghefi, PM; Graca, MP; Amaral, JS; Willinger, MG; Amaral, VS
nationality International
journal JOURNAL OF PHYSICS D-APPLIED PHYSICS
author keywords multiferroics; LuMnO3; microscopy; interfaces; ferroelectrics
keywords MAGNETIC-PROPERTIES; MANGANITES; YMNO3; BEHAVIOR; DOMAINS; ORIGIN; EELS; MN
abstract A study on the underlying interaction mechanisms between lattice constants, magnetic and dielectric properties with inhomogeneities or internal interfaces in hexagonal, off-stoichiometric LuMnO3 oxide is presented. By increasing Mn content the a-axis constant and volume of the unit cell, the antiferromagnetic (AFM) Neel temperature, T-N, and frustration factor of the frustrated Mn3+ trimmers in basal plane show decreasing trends. It was found that increasing the annealing time improves the properties of the lattices and progressively eliminates secondary phases for compositions within the solid solution stability limits. A magnetic contribution below TN is observed for all samples. Two regimes of magnetization below and above 45 K were observed in the AFM state. The magnetic contribution below TN is assigned to either the secondary phase or internal interfaces like ferroelectric (FE) domain walls. Magneto-dielectric coupling at TN is preserved in off-stoichiometric ceramics. The presence of a low temperature anomaly of the dielectric constant is correlated to the composition of the solid solution in off-stoichiometric ceramics. Large FE domains are observed in piezoresponse force microscopy (PFM) images of doped and un-doped ceramics, whereas atomic structure analysis indicates the parallel formation of nano-sized FE domains. A combination of measured properties and microscopy images of micron-and nano-sized domains ascertain the role of lattice distortion and stability of solid solution on multiferroic properties.
publisher IOP PUBLISHING LTD
issn 0022-3727
year published 2017
volume 50
issue 5
digital object identifier (doi) 10.1088/1361-6463/50/5/055304
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000393678400001
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  impact metrics
times cited (wos core): 0
journal impact factor (jcr 2016): 2.588
5 year journal impact factor (jcr 2016): 2.747
category normalized journal impact factor percentile (jcr 2016): 70.408
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