Unraveling dzyaloshinskii-moriya interaction and chiral nature of graphene/cobalt interface
| Autor: | Mariona Cabero, Paolo Perna, Leticia de Melo Costa, Pierluigi Gargiani, Julio Camarero, Pablo Olleros, Alberto Anadón Barcelona, Jan Vogel, Ruben Guerrero, Adrian Gudin, Stefania Pizzini, Rodolfo Miranda, Fernando Ajejas, Maria Varela, Jose Manuel Diez, Manuel Valvidares, Miguel Angel Niño |
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| Přispěvatelé: | Universidad Autonoma de Madrid (UAM), Instituto IMDEA Nanociencia [Madrid], Instituto Imdea Nanociencia, Micro et NanoMagnétisme (MNM ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), ALBA Synchrotron light source [Barcelone], Instituto de Magnetismo Aplicado, UCM-ADIF-CSIC |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Oxide FOS: Physical sciences Bioengineering 02 engineering and technology Substrate (electronics) 01 natural sciences law.invention chemistry.chemical_compound law 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Materials Science Texture (crystalline) 010306 general physics Spin-½ Condensed Matter - Materials Science Spintronics Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Graphene Física de materiales Mechanical Engineering Materials Science (cond-mat.mtrl-sci) General Chemistry Spin–orbit interaction 021001 nanoscience & nanotechnology Condensed Matter Physics Ferromagnetism chemistry [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other] Física del estado sólido [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] 0210 nano-technology |
| Zdroj: | Nano Letters Nano Letters, American Chemical Society, 2018, 18 (9), pp.5364-5372. ⟨10.1021/acs.nanolett.8b00878⟩ E-Prints Complutense. Archivo Institucional de la UCM instname Repositorio Institucional del Instituto Madrileño de Estudios Avanzados en Nanociencia E-Prints Complutense: Archivo Institucional de la UCM Universidad Complutense de Madrid |
| ISSN: | 1530-6984 1530-6992 |
| Popis: | A major challenge for future spintronics is to develop suitable spin transport channels with long spin lifetime and propagation length. Graphene can meet these requirements, even at room temperature. On the other side, taking advantage of the fast motion of chiral textures, i.e., N\'eel-type domain walls and magnetic skyrmions, can satisfy the demands for high-density data storage, low power consumption and high processing speed. We have engineered epitaxial structures where an epitaxial ferromagnetic Co layer is sandwiched between an epitaxial Pt(111) buffer grown in turn onto MgO(111) substrates and a graphene layer. We provide evidence of a graphene-induced enhancement of the perpendicular magnetic anisotropy up to 4 nm thick Co films, and of the existence of chiral left-handed N\'eel-type domain walls stabilized by the effective Dzyaloshinskii-Moriya interaction (DMI) in the stack. The experiments show evidence of a sizeable DMI at the gr/Co interface, which is described in terms of a conduction electron mediated Rashba-DMI mechanism and points opposite to the Spin Orbit Coupling-induced DMI at the Co/Pt interface. In addition, the presence of graphene results in: i) a surfactant action for the Co growth, producing an intercalated, flat, highly perfect fcc film, pseudomorphic with Pt and ii) an efficient protection from oxidation. The magnetic chiral texture is stable at room temperature and grown on insulating substrate. Our findings open new routes to control chiral spin structures using interfacial engineering in graphene-based systems for future spin-orbitronics devices fully integrated on oxide substrates. Comment: 10 pages, 6 figures |
| Databáze: | OpenAIRE |
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