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. 2020 Nov 9;11:5670. doi: 10.1038/s41467-020-19420-6

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a Scheme of the full device configuration. After the opening of small micrometric junctions by a lithographic step, top reference Al₂O₃/Co spin analyzer is deposited by ALD followed by sputtering. b Non-linear dc I–V characteristics show the expected tunneling behavior of the Al₂O₃/Co spin analyzer and c magneto-transport dc measurements reveal a −12% TMR spin signal. The epitaxial Ni(111)/graphene electrode is thus shown to produce a strong spin filtering effect.