Long-living terahertz magnons in ultrathin metallic ferromagnets

Abstract

The main idea behind magnonics is to use the elementary magnetic excitations (magnons) for information transfer and processing. One of the main challenges, hindering the application of ultrafast terahertz magnons in magnonics, has been the short lifetime of these excitations in metallic ferromagnets. Here, we demonstrate that the engineering of the electronic structure of a ferromagnetic metal, by reducing its dimensionality and changing its chemical composition, opens a possibility to strongly suppress the relaxation channels of terahertz magnons and thereby enhance the magnons' lifetime. For the first time, we report on the long-lived terahertz magnons excited in ultrathin metallic alloy films. On the basis of the first-principles calculations, we explain the microscopic nature of the long lifetime being a consequence of the peculiar electronic hybridizations of the species. We further demonstrate a way of tailoring magnon energies (frequencies) by varying the chemical composition of the film.

De Novo Design of Recombinant Spider Silk Proteins for Material Applications

“…Multiscale computational modeling, a simulation method to disclosure the structure-property relationships of materials at multiple scales of time and/or space, is a powerful toolkit for in silico design, analysis, and optimization of the RSSP materials from the molecular scale. [23][24][25]27,28,34,77,[107][108][109] These structures include molecular weight, sizes, and distributions of protein segments, hydrophobic/hydrophilic partitioning, and terminal regions of the spidroins. Of note, owing to the limitations in the performance of computers as well as the accuracy of models and force-fields that used, multiscale computational modeling is more suitable for peptides and small proteins designs.…”

“…Three promising de novo routes have emerged in recent years: (i) genetic synthesis of high molecular weight RSSPs; (ii) multiscale self-assembly of RSSPs; and (iii) design and optimization of the RSSP sequences through computational simulation. [23][24][25][26][27][28] These strategies significantly improved the mechanical performance of RSSP materials and even imbued them with additional functions, such as energy absorption, [29] water collection, [30] optical elements, [31,32] biomaterials for chondrocyte regeneration, [33] and as nerve conduits. [17,34,35] In this article, we first introduce the material design strategies for natural spider silk and focus on the discussion of the structure-property-function relationships for the spider silk.…”

Custom 3D Printable Silicones with Tunable Stiffness

“…Reports to date have relied heavily on the use of a singular commercially available thixotropic material, Dow Corning SE 1700. This matrix has been utilized in the 3D printing of silicones with negative stiffness, [8] as synthetic spider webs, [14] as materials with programmable concern with regard to long-term applications. [23] Hydrophobic fillers are incapable of forming transient 3D networks; therefore, an additional additive is necessary to impart silicone pseudoplasticity.…”

“…Reports to date have relied heavily on the use of a singular commercially available thixotropic material, Dow Corning SE 1700. This matrix has been utilized in the 3D printing of silicones with negative stiffness, [8] as synthetic spider webs, [14] as materials with programmable…”

Inkjet Printing of Curing Agent on Thin PDMS for Local Tailoring of Mechanical Properties

“…[42] For example, PDMS has been pneumatically extruded through a syringe with minimum diameter of 200 µm to form synthetic spider webs. [43] Photopatternable PDMS has made linewidths down to 100 µm in 20-80 µm thick films. [44] The freeform reversable embedding (FRE) method with an oil-based micro-organogel bath material resulted in features with 30 µm width and 50 µm height.…”