  The magnetic anisotropy of low-dimensional Mott systems exhibits unexpected
magnetotransport behavior useful for spin-based quantum electronics. Yet, the
anisotropy of natural materials is inherently determined by the crystal
structure, highly limiting its engineering. We demonstrate the magnetic
anisotropy modulation near a digitized dimensional Mott boundary in artificial
superlattices composed of a correlated magnetic monolayer SrRuO3 and
nonmagnetic SrTiO3. The magnetic anisotropy is initially engineered by
modulating the interlayer coupling strength between the magnetic monolayers.
Interestingly, when the interlayer coupling strength is maximized, a nearly
degenerate state is realized, in which the anisotropic magnetotransport is
strongly influenced by both the thermal and magnetic energy scales. Our results
offer a new digitized control for magnetic anisotropy in low-dimensional Mott
systems, inspiring promising integration of Mottronics and spintronics.
