Physics Colloquium, Ilaria Bergenti, CNR-ISMN, Bologna, Italy

Abstract:

Organic semiconductors emerged as non conventional spintronic materials about ten years ago, when a few papers appeared with straightforward claims on spintronics phenomena [1]. From then on, Organic Spintronics has evolved into a multifaced discipline by a large number of theoretical and experimental investigations.

After a brief introduction on the important achievement in the Organic Spintronic field, I will present our recent investigations on multifunctional devices based on metal quinoline organic material[2] showing correlated magnetoresistive and bistability effects.

By combining spectroscopic investigations (HAXPES and XAS) and electrical and magnetoresistive characterization, we clearly identify that electronic and chemical configuration of both the organic spacer and interfacial layer with metallic contacts is affected by the Resistive switching and involves oxygen redistribution within the alumina tunnel barrier [3].

Moreover, I will briefly discuss the more recent directions of organic spintronics, in particular how molecular materials have recently arisen as an ideal platform for creating interfacial spin effects, the so called “spinterface”[4].

[1] Dediu, V. A. et al., Nature Materials 8, 707 (2009)
[2] M. Prezioso, Adv. Mater. 2011, 23 , 1371
[3] I.Bergenti et al, ACS Mat.& Interf, submitted
[4] M Cinchetti, Nat. Mater. 16, 507-515 (2017)