Bergenti, I. et al. (2018) Oxygen impurities link bistability and magnetoresistance in organic spin valves. ACS Applied Materials and Interfaces, 10(9), pp. 8132-8140. (doi: 10.1021/acsami.7b16068) (PMID:29411962)
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Abstract
Vertical cross-bar devices based on manganite and cobalt injecting electrodes and metal-quinoline molecular transport layer are known to manifest both magnetoresistance and electrical bistability. The two effects are strongly interwoven, inspiring new device applications such as electrical control of the magnetoresistance and magnetic modulation of bistability. To investigate the full device functionality, we first identify the mechanism responsible for electrical switching by associating the electrical conductivity and the impedance behavior with chemical states of buried layers obtained by in operando photoelectron spectroscopy. These measurements revealed that a significant fraction of oxygen ions migrates under voltage polarity, resulting in a modification of the electronic properties of the organic material and of the oxidation of interfacial layer with ferromagnetic contacts. Variable oxygen doping of the organic molecule represents the key element for correlating bistability and magnetoresistance and our measurements provide the first experimental evidence in favor of the impurity band model describing the spin transport in organic semiconductors in similar devices.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | MacLaren, Professor Donald |
| Authors: | Bergenti, I., Borgatti, F., Calbucci, M., Riminucci, A., Cecchini, R., Graziosi, P., MacLaren, D. A., Giglia, A., Rueff, J. P., Céolin, D., Pasquali, L., and Dediu, V. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | ACS Applied Materials and Interfaces |
| Publisher: | American Chemical Society |
| ISSN: | 1944-8244 |
| ISSN (Online): | 1944-8252 |
| Published Online: | 07 February 2018 |
| Copyright Holders: | Copyright © 2018 American Chemical Society |
| First Published: | First published in ACS Applied Materials and Interfaces 10(9):8132-8140 |
| Publisher Policy: | Reproduced in accordance with the publisher copyright policy |
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