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Realization of novel functionalities by tuning magnetic interactions in rareearth perovskite oxide thin films opens up exciting technological prospects.Strain-induced tuning of magnetic interactions in rare earth cobaltates andnickelates is of central importance due to their versatility in electronictransport properties. Here we reported the spin re-orientation inducedswitching of anisotropic magnetoresistance (AMR) and its tunability with strainin epitaxial LaCo$_{0.5}$Ni$_{0.5}$O$_{3-\delta}$ thin films across theferromagnetic transition. Moreover, with strain tuning, we could observe atwo-fold to four-fold symmetry crossover in AMR across the magnetic transitiontemperature. The magnetization measurements revealed an onset of ferromagnetictransition around 50 K, and a further reduction in temperature showed a subtlechange in the magnetization dynamics, which reduced the ferromagneticlong-range ordering and introduced glassiness in the system. X-ray absorptionand X-ray magnetic circular dichroism spectroscopy measurements over Co and NiL edges revealed the Co spin state transition below the magnetic transitiontemperature leading to the AMR switching and also the presence of Ni$^{2+}$ andCo$^{4+}$ ions evidencing the charge transfer from Ni to Co ions. Our workdemonstrated the tunability of magnetic interactions mediated electronictransport in cobaltate-nickelate thin films, which is relevant in understandingNi-Co interactions in oxides for their technological applications such as inAMR sensors.

Spin re-orientation induced anisotropic magnetoresistance switching in LaCo$_{0.5}$Ni$_{0.5}$O$_{3-\delta}$ thin films