Journal
ACS APPLIED ELECTRONIC MATERIALS
Volume 4, Issue 9, Pages 4273-4279Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaelm.2c00300
Keywords
tunnel junction; spinterface; molecular spintronics; C-60; hybrid interface; spin-dependent density of states
Funding
- European Union [965046]
- FET-Open project Interfast (Gated INTERfaces for FAST information processes)
- Open SINFONIA [964396 FET]
- ICTP Programme for Training and Research in Italian Laboratories, Trieste, Italy
- CALMIP [2021-P21008]
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Orbital hybridization at the Co/C-60 interface strongly enhances the magnetic anisotropy of the cobalt layer, while also affecting its ability to support spin-polarized currents and inducing a spin-filtering effect.
Orbital hybridization at the Co/C-60 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/C-60 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/C-60 bilayer in the role of a spin-polarized electrode in the La0.7Sr0.3MnO3/SrTiO3/C-60/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/C-60 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.
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