Spinterface effects in hybrid La0.7Sr0.3MnO3/SrTiO3/C60/Co magnetic tunnel junctions

Bergenti, I. et al. (2022) Spinterface effects in hybrid La0.7Sr0.3MnO3/SrTiO3/C60/Co magnetic tunnel junctions. ACS Applied Electronic Materials, 4(9), pp. 4273-4279. (doi: 10.1021/acsaelm.2c00300) (PMID:36193212) (PMCID:PMC9523579)

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Abstract

Orbital hybridization at the Co/C60 interface been has proved to strongly enhance the magnetic anisotropy of the cobalt layer, promoting such hybrid systems as appealing components for sensing and memory devices. Correspondingly, the same hybridization induces substantial variations in the ability of the Co/C60 interface to support spin-polarized currents and can bring out a spin-filtering effect. The knowledge of the effects at both sides allows for a better and more complete understanding of interfacial physics. In this paper we investigate the Co/C60 bilayer in the role of a spin-polarized electrode in the La0.7Sr0.3MnO3/SrTiO3/C60/Co configuration, thus substituting the bare Co electrode in the well-known La0.7Sr0.3MnO3/SrTiO3/Co magnetic tunnel junction. The study revealed that the spin polarization (SP) of the tunneling currents escaping from the Co/C60 electrode is generally negative: i.e., inverted with respect to the expected SP of the Co electrode. The observed sign of the spin polarization was confirmed via DFT calculations by considering the hybridization between cobalt and molecular orbitals.

Item Type:Articles
Additional Information:This work was supported by the European Union’s Horizon 2020 Research and Innovation programme under grant agreement no. 965046, FET-Open project Interfast (Gated INTERfaces for FAST information processes), and no. 964396 FET-Open SINFONIA (Selectively activated INFOrmation technology by hybrid Organic Interfaces). R.K.R. and M.S. acknowledge the receipt of fellowships from the ICTP Programme for Training and Research in Italian Laboratories, Trieste, Italy. D.L. acknowledges the HPC resources from CALMIP (Grant 2021-P21008).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:MacLaren, Professor Donald
Authors: Bergenti, I., Kamiya, T., Li, D., Riminucci, A., Graziosi, P., MacLaren, D. A., Rakshit, R. K., Singh, M., Benini, M., Tada, H., Smogunov, A., and Dediu, V. A.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:ACS Applied Electronic Materials
Publisher:American Chemical Society
ISSN:2637-6113
ISSN (Online):2637-6113
Published Online:24 August 2022
Copyright Holders:Copyright © 2022 The Authors
First Published:First published in ACS Applied Electronic Materials 4(9): 4273-4279
Publisher Policy:Reproduced under a Creative Commons License

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