Organic semiconductor spacer thickness-dependent interface defect state spin injection across tunnel magnetoresistance devicesYadlapalli Sujatha, Meeniga Srikanth Reddy and Debajit DebEur. Phys. J. B, 98 9 (2025) 185DOI: https://doi.org/10.1140/epjb/s10051-025-01031-z