In this paper, we demonstrate the capability to establish spin-polarized currents in doped $\mathrm{SrTi}{\mathrm{O}}_3$ (STO). The results are based on the study of charge and spin transport in STO layers doped by the reversible electromigration of oxygen atoms in resistive-switching ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}\mathrm{Mn}{\mathrm{O}}_3/\mathrm{STO}/\mathrm{Co}$ vertical stacks. The formation of oxygen vacancies inside STO results in a metallic conductivity at temperatures $<200–250$ K, above which a transition to an insulatinglike behavior is detected. A detailed theoretical analysis shows that the behavior of the metallic phase in our samples corresponds to the well-known state of the thermodynamically doped STO featuring the so-called bad metal behavior. Thus, our findings introduce this class of unconventional materials as valuable candidates for innovative spintronic devices.

• Received 7 November 2022
• Revised 30 April 2023
• Accepted 14 June 2023

DOI:https://doi.org/10.1103/PhysRevResearch.5.033096

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Published by the American Physical Society