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Using ultrafast optical spectroscopy, we show that polaronic behaviorassociated with interfacial antiferromagnetic order is likely the origin oftunable magnetotransport upon switching the ferroelectric polarity in aLa$_{0.7}$Ca$_{0.3}$MnO$_{3}$/BiFeO$_{3}$ (LCMO/BFO) heterostructure. This isrevealed through the difference in dynamic spectral weight transfer betweenLCMO and LCMO/BFO at low temperatures, which indicates that transport inLCMO/BFO is polaronic in nature. This polaronic feature in LCMO/BFO decreasesin relatively high magnetic fields due to the increased spin alignment, whileno discernible change is found in the LCMO film at low temperatures. Theseresults thus shed new light on the intrinsic mechanisms governingmagnetoelectric coupling in this heterostructure, potentially offering a newroute to enhancing multiferroic functionality.

Polaronic transport induced by competing interfacial magnetic order in a La$_{0.7}$Ca$_{0.3}$MnO$_{3}$/BiFeO$_{3}$ heterostructure