KC, A. ... et al., 2017. Weak ferromagnetism and short range polar order in NaMnF3 thin films. Applied Physics Letters, 110, 092901; doi: 10.1063/1.4977421
The orthorhombically distorted perovskite NaMnF3 has been predicted to become ferroelectric if an a = c distortion of the bulk Pnma structure is imposed. In order to test this prediction, NaMnF3 thin films were grown on SrTiO3 (001) single crystal substrates via molecular beam epitaxy. The best films were smooth and single phase with four different twin domains. In-plane magnetization measurements revealed the presence of antiferromagnetic ordering with weak ferromagnetism below the Néel temperature TN = 66 K. For the dielectric studies, NaMnF3 films were grown on a 30 nm SrRuO3 (001) layer used as a bottom electrode grown via pulsed laser deposition. The complex permittivity as a function of frequency indicated a strong Debye-like relaxation contribution characterized by a distribution of relaxation times. A power-law divergence of the characteristic relaxation time revealed an order-disorder phase transition at 8 K. The slow relaxation dynamics indicated the formation of super-dipoles (superparaelectric moments) that extend over several unit cells, similar to polar nanoregions of relaxor ferroelectrics.
This paper was published in the journal, Applied Physics Letters and the definitive version is available at: http://dx.doi.org/10.1063/1.4977421 with supplementary information at: ftp://ftp.aip.org/epaps/appl_phys_lett/E-APPLAB-110-018709
This work was supported by the National Science Foundation
(grant # 1434897) and the WVU Shared Research Facilities.