  The ability to tune magnetic orders, such as magnetic anisotropy and
topological spin texture, is desired in order to achieve high-performance
spintronic devices. A recent strategy has been to employ interfacial
engineering techniques, such as the introduction of spin-correlated interfacial
coupling, to tailor magnetic orders and achieve novel magnetic properties. We
chose a unique polar-nonpolar LaMnO3/SrIrO3 superlattice because Mn (3d)/Ir
(5d) oxides exhibit rich magnetic behaviors and strong spin-orbit coupling
through the entanglement of their 3d and 5d electrons. Through magnetization
and magnetotransport measurements, we found that the magnetic order is
interface-dominated as the superlattice period is decreased. We were able to
then effectively modify the magnetization, tilt of the ferromagnetic easy axis,
and symmetry transition of the anisotropic magnetoresistance of the
LaMnO3/SrIrO3 superlattice by introducing additional Mn (3d) and Ir (5d)
interfaces. Further investigations using in-depth first-principles calculations
and numerical simulations revealed that these magnetic behaviors could be
understood by the 3d/5d electron correlation and Rashba spin-orbit coupling.
The results reported here demonstrate a new route to synchronously engineer
magnetic properties through the atomic stacking of different electrons,
contributing to future applications.
