Over the past years, novel quantum phenomena in strongly correlated magnetic

materials have garnered tremendous attention for their huge implications in

information storage and logic technology applications. At the heart of this theme,

lie two engineering challenges: the manipulations of magnetic anisotropies as well as topology in the electronic band structures. Due to the lack of accessible

controlling parameters, these manipulations have been challenging and indirect.

In this talk I will present our studies on manipulating the magnetic anisotropies and the band topologies in strongly correlated ruthenate thin films, using local lattice deformation induced by chemical doping. Combining local structural analysis using scanning transmission electron microscopy as well as first principle

calculations, we found that the abrupt change in oxygen octahedral rotation

patterns in the lattice structures plays a key role. These results not only construct

important insights in engineering quantum magnetism in strongly correlated

systems but also provide an ideal platform for magnetic device applications in

information technology.