摘要
Interphase strain engineering provides a unique methodology to significantly modify the lattice structure across a single film,enabling the emergence and manipulation of novel functionalities that are inaccessible in the context of traditional strain engineering methods.In this work,by using the interphase strain,we achieve a ferromagnetic state with enhanced Curie temperature and a room-temperature polar state in EuO secondary phase-tunned EuTiO_(3) thin films.A combination of atomic-scale electron microscopy and synchrotron X-ray spectroscopy unravels the underlying mechanisms of the ferroelectric and ferromagnetic properties enhancement.Wherein,the EuO secondary phase is found to be able to dramatically distort the TiO_6 octahedra,which favors the non-centrosymmetric polar state,weakens antiferromagnetic Eu-Ti-Eu interactions,and enhances ferromagnetic Eu-O-Eu interactions.Our work demonstrates the feasibility and effectiveness of interphase strain engineering in simultaneously promoting ferroelectric and ferromagnetic performance,which would provide new thinking on the property regulation of numerous strongly correlated functional materials.
基金
supported by the National Key Basic Research Program of China(Nos.2020YFA0309100 and 2019YFA0308500)
the National Natural Science Foundation of China(Nos.21825102,22001014,11294029,11974390,11721404)
the China National Postdoctoral Program for Innovative Talents(No.BX20200043)
China Postdoctoral Science Foundation(No.2021M690366)
the Beijing Nova Program of Science and Technology(No.Z191100001119112)
the Beijing Natural Science Foundation(No.2202060)
the Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology,the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(No.XDB33030200)
the Fundamental Research Funds for the Central Universities,China(Nos.06500145 and FRF-IDRY-20–039)
State Key Laboratory of New Ceramic and Fine Processing Tsinghua University(No.KF202110)。
