We propose and demonstrate that a carrier thermal gradient in a graphene lateral spin valve can lead to a large increase of the spin voltage near to the graphene charge neutrality point. Such an increase results from a thermoelectric spin voltage, which is analogous to the voltage in a thermocouple and that can be enhanced by the presence of hot carriers generated by an applied current. These results could prove […]
A large enhancement in the spin–orbit coupling of graphene has been predicted when interfacing it with semiconducting transition metal dichalcogenides. Signatures of such an enhancement have been reported, but the nature of the spin relaxation in these systems remains unknown. Here, we unambiguously demonstrate anisotropic spin dynamics in bilayer heterostructures comprising graphene and tungsten or molybdenum disulphide (WS2, MoS2). We observe that the spin lifetime varies over one order of […]
One of the most fascinating puzzles for the graphene and spintronics communities is identifying the main microscopic process for spin relaxation in graphene. Conventional relaxation mechanisms have yielded contradictory results when applied to single-layer graphene. In an article published today in Nature Communications, researchers from the Institut Català de Nanociència i Nanotecnologia (ICN2) determine the spin lifetime anisotropy of spin-polarized carriers in graphene, which is expected to generate valuable information […]
The PEND group has been invited to participate in the European Commission Graphene Flagship project. This invitation recognizes the recent results by the group on spintronics and, more specifically, those involving graphene. The participation in this project will help strengthen the resources of the group to work on graphene spintronics as well as the collaboration with the main teams working in this field across Europe. About the EC Graphene Flagship […]
Our review article on spin Hall effects just appeared on the cover of the last issue of Reviews of Modern Physics (October-December 2015). Link to the publication
We review current challenges and perspectives in graphene spintronics, which is one of the most promising directions of innovation, given its room-temperature long-spin lifetimes and the ability of graphene to be easily interfaced with other classes of materials (ferromagnets, magnetic insulators, semiconductors, oxides, etc), allowing proximity effects to be harvested. Link to publication
Hot-Carrier Seebeck Effect: Diffusion and Remote Detection of Hot Carriers in Graphene Juan F. Sierra, Ingmar Neumann, Marius V. Costache, and Sergio O. Valenzuela Link to publication
Following the success of “Spin Current” (Oxford University Press) co-edited by S. Maekawa, S. O. Valenzuela, E. Saitoh, and T. Kimura, the book has been made available in paperback format (Link).
As announced at the International Conference of Magnetism (link), Marius has been awarded IUPAP Young Scientist Medals in the field of magnetism to recognize his outstanding work on spintronics during his PhD at the University of Groningen and his tenure at ICN2, in particular that associated to spin pumping and magnon dynamics. The Medals are presented every three years, at the International Conference on Magnetism. One medal is usually awarded for […]
The observation of the magnon drag ends a 50-year long effort to isolate this thermoelectric effect, which was predicted in analogy with the phonon drag. We used a unique device geometry, which resembles a thermopile, to discriminate the magnon drag from other thermoelectric effects. For more information follow the link or click on “Research”.