CNR ExploRA

Articolo in rivista, 2023, ENG, 10.1103/PhysRevResearch.5.033096

Spin injection in the doped bad metal SrTiO3

Graziosi, Patrizio and Bergenti, Ilaria and Vistoli, Lorenzo and Galassi, Fabio and Calbucci, Marco and Riminucci, Alberto and Borgatti, Francesco and MacLaren, Donald A. and O'Shea, Kerry J. and Vinai, Giovanni and Torelli, Piero and Panaccione, Giancarlo and Kabanov, Viktor and Dediu, Valentin Alek

Graziosi, P (Corresponding Author), CNR, Ist Studio Mat Nanostrutturati, ISMN, Via Gobetti 101, I-40129 Bologna, Italy. Graziosi, Patrizio; Bergenti, Ilaria; Vistoli, Lorenzo; Galassi, Fabio; Calbucci, Marco; Riminucci, Alberto; Borgatti, Francesco; Dediu, Valentin Alek, CNR, Ist Studio Mat Nanostrutturati, ISMN, Via Gobetti 101, I-40129 Bologna, Italy. MacLaren, Donald A.; O'Shea, Kerry J., Univ Glasgow, Sch Phys & Astron SUPA, Glasgow G12 8QQ, Scotland. Vinai, Giovanni; Torelli, Piero; Panaccione, Giancarlo, CNR, Lab TASC, IOM, SS 14km 163-5, I-34149 Trieste, Italy. Kabanov, Viktor, JSI Jozef Stefan Inst, Jamova Cesta 39, Ljubljana 1000, Slovenia.

In this paper, we demonstrate the capability to establish spin-polarized currents in doped SrTiO3 (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 La0.7Sr0.3MnO3/STO/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.

Physical review research 5 (3), pp. 033906-1–033906-11