title: Deep data analysis of conductive phenomena on complex oxide interfaces: physics from data mining.
abstract: Spatial variability of electronic transport in BiFeO3-CoFe2O4 (BFO-CFO) self-assembled heterostructures is explored using spatially resolved first-order reversal curve (FORC) current voltage (IV) mapping. Multivariate statistical analysis of FORC-IV data classifies statistically significant behaviors and maps characteristic responses spatially. In particular, regions of grain, matrix, and grain boundary responses are clearly identified. k-Means and Bayesian demixing analysis suggest the characteristic response be separated into four components, with hysteretic-type behavior localized at the BFO-CFO tubular interfaces. The conditions under which Bayesian components allow direct physical interpretation are explored, and transport mechanisms at the grain boundaries and individual phases are analyzed. This approach conjoins multivariate statistical analysis with physics-based interpretation, actualizing a robust, universal, data-driven approach to problem solving, which can be applied to exploration of local transport and other functional phenomena in other spatially inhomogeneous systems.
authors.affiliation: Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.
authors.forename: Evgheni
authors.initials: E
authors.lastname: Strelcov
authors.forename: Alexei
authors.initials: A
authors.lastname: Belianinov
authors.forename: Ying-Hui
authors.initials: YH
authors.lastname: Hsieh
authors.forename: Stephen
authors.initials: S
authors.lastname: Jesse
authors.forename: Arthur P
authors.initials: AP
authors.lastname: Baddorf
authors.forename: Ying-Hao
authors.initials: YH
authors.lastname: Chu
authors.forename: Sergei V
authors.initials: SV
authors.lastname: Kalinin