  We report on the study of both perpendicular magnetic anisotropy (PMA) and
Dzyaloshinskii-Moriya interaction (DMI) at an oxide/ferromagnetic metal (FM)
interface, i.e. BaTiO3 (BTO)/CoFeB. Thanks to the functional properties of the
BTO film and the capability to precisely control its growth, we are able to
distinguish the dominant role of the oxide termination (TiO2 vs BaO), from the
moderate effect of ferroelectric polarization in the BTO film, on the PMA and
DMI at the oxide/FM interface. We find that the interfacial magnetic anisotropy
energy of the BaO-BTO/CoFeB structure is two times larger than that of the
TiO2-BTO/CoFeB, while the DMI of the TiO2-BTO/CoFeB interface is larger. We
explain the observed phenomena by first-principles calculations, which ascribe
them to the different electronic states around the Fermi level at the
oxide/ferromagnetic metal interfaces and the different spin-flip processes.
This study paves the way for further investigation of the PMA and DMI at
various oxide/FM structures and thus their applications in the promising field
of energy-efficient devices.
