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Inversion of Spin Signal and Spin Filtering in Ferromagnet vertical bar Hexagonal Boron Nitride-Graphene van der Waals Heterostructures
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics. Chalmers, Dept Microtechnol & Nanosci, SE-41296 Gothenburg, Sweden..
Chalmers, Dept Microtechnol & Nanosci, SE-41296 Gothenburg, Sweden..
Univ Twente, Fac Sci & Technol, POB 217, NL-7500 AE Enschede, Netherlands.;Univ Twente, MESA Inst Nanotechnol, POB 217, NL-7500 AE Enschede, Netherlands..
Chalmers, Dept Microtechnol & Nanosci, SE-41296 Gothenburg, Sweden..
2016 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, 21168Article in journal (Refereed) Published
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Abstract [en]

Two dimensional atomically thin crystals of graphene and its insulating isomorph hexagonal boron nitride (h-BN) are promising materials for spintronic applications. While graphene is an ideal medium for long distance spin transport, h-BN is an insulating tunnel barrier that has potential for efficient spin polarized tunneling from ferromagnets. Here, we demonstrate the spin filtering effect in cobalt vertical bar few layer h-BN vertical bar graphene junctions leading to a large negative spin polarization in graphene at room temperature. Through nonlocal pure spin transport and Hanle precession measurements performed on devices with different interface barrier conditions, we associate the negative spin polarization with high resistance few layer h-BN vertical bar ferromagnet contacts. Detailed bias and gate dependent measurements reinforce the robustness of the effect in our devices. These spintronic effects in two-dimensional van der Waals heterostructures hold promise for future spin based logic and memory applications.

Place, publisher, year, edition, pages
2016. Vol. 6, 21168
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:uu:diva-281800DOI: 10.1038/srep21168ISI: 000370382200001PubMedID: 26883717OAI: oai:DiVA.org:uu-281800DiVA: diva2:915652
Funder
Swedish Research CouncilChalmers Nano‚ÄźinitiativeEU, FP7, Seventh Framework Programme
Available from: 2016-03-30 Created: 2016-03-30 Last updated: 2017-11-30Bibliographically approved

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Kamalakar, M. Venkata

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