Acidic aqueous solution switching of magnetism in BiFeO3/La1-xSrxMnO3 heterostructures

摘要

Control of magnetism in multiferroic heterostructures using low-energy consumption is significant both in fundamental physics and for practical applications such as storage or logic devices. Through switching the ferroelectric polarization of the whole BiFeO3 films using an acidic aqueous solution, we studied the deterministic control of exchange coupling and magnetization in BiFeO3/La1-xSrxMnO3 heterostructures. It is found that the hole concentration of La1-xSrxMnO3 is closely coupled with BiFeO3 polarization, which can be used to switch the interfacial magnetism. The polarization-determined exchange coupling for the Sr concentration of x = 0.2 is contrary to that of x = 0.33 and 0.5 due to different double exchange strengths, while for x = 0.5, the coupling effects are more sensitive to polarization. This work provides a pathway to control interfacial magnetism and multiferroicity at a large scale using green energy. Published under license by AIP Publishing.