Spin-to-charge current interconversions are widely exploited for the generation and detection of pure spin currents and are key ingredients for future spintronic devices including spin-orbit torques and spin-orbit logic circuits. In case of the spin Hall effect, different mechanisms contribute to the phenomenon and determining the leading contribution is peremptory for achieving the largest conversion efficiencies. Here, we experimentally demonstrate the dominance of the intrinsic mechanism of the spin Hall effect in highly-resistive Ta. We obtain an intrinsic spin Hall conductivity for β-Ta of -820±120 (ħ/e) Ω -1 cm -1 from spin absorption experiments in a large set of lateral spin valve devices. The predominance of the intrinsic mechanism in Ta allows us to linearly enhance the spin Hall angle by tuning the resistivity of Ta, reaching up to -35±3 %, the largest reported value for a pure metal.Condensed matter systems with strong spin-orbit coupling (SOC) are extensively studied in the emerging field of spin-orbitronics due to the novel effects and functionalities originated from the interplay between the charge and the spin of electrons. The spin Hall effect (SHE) in heavy metals [1,2] and Edelstein effect in Rashba interfaces [3,4,5] or in the Dirac surface states of topological insulators [3,6] are some of the phenomena discovered in this field. They all lead to spin-to-charge current interconversions, which are essential for future spin-orbit-based technological applications such as spin-orbit torques for magnetization switching [7,8,9,10] or spin-orbit logic [11,12].
The novel application of gold and silver nanorods as irreversible thermochromic dyes in polymeric ionic liquid (PIL) nanocomposites is proposed here. These materials have been synthesized by anion exchange of an imidazolium-based PIL in a solution that also contained gold nanorods. This resulted in the entrapment of the nanoobjects within a solid polymer precipitate. In this article, the effect of the temperature was studied in relation to the change of shape and, consequently, color of the gold or silver nanorods within the films. For the nanocomposites studied here, a maximum of two visual thermochromic transitions was observed for gold nanorods and up to three transitions were observed for silver nanorods.
A novel pathway is presented to transfer and embed functional patterned magnetic nanostructures into flexible and stretchable polymeric membranes. The geometrical and magnetic properties are maintained through the process, realized even directly inside a microfluidic channel. These results pave the way to the realization of smart biomedical systems and devices based on the integration of magnetic nanostructures into new classes of substrates.
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