Surface Plasmon Resonance from Bimetallic Interface in Au–Ag Core–Shell Structure Nanowires

Transverse surface plasmon resonances (SPR) in Au–Ag and Ag–Au core–shell structure nanowires have been investigated by means of quasi-static theory. There are two kinds of SPR bands resulting from the outer surface of wall metal and the interface between core and wall metals, respectively. The SPR corresponding to the interface, which is similar to that of alloy particle, decreases and shifts obviously with increasing the wall thickness. However, the SPR corresponding to the outer surface, which is similar to that of pure metal particle, increases and shifts slightly with increasing the wall thickness. A mechanism based on oscillatory surface electrons under coulombic attraction is developed to illuminate the shift fashion of SPR from bimetallic core–shell interface. The net charges and extra coulombic force in metallic wall affect the SPR energy and the shift fashion

Use of Caco-2 cells and LC/MS/MS to screen a peptide combinatorial library for permeable structures

The transepithelial transport of a synthetic peptide combinatorial library containing 375,000 individual peptides was assessed using Caco-2 cell monolayers in order to screen for permeability and deliverability. A series of 150 pools, each containing 2500 tripeptide sequences, were applied to the apical side of Caco-2 monolayers. Basolateral side samples were collected after 4 h and screened by capillary high-pressure liquid chromatography. The majority of pools showed no permeable species, due to low solubility, limited permeability and extensive metabolism. Several pools contained permeable structure, and transport proved reproducible with passage number and time. Permeable structures were identified by liquid chromatography/mass spectrometry/mass spectrometry (LC/MS/MS). To discriminate between isobaric structures, several tripeptides were resynthesized and tested as discrete compounds. For example, 1-2% D-Phe-D-Ala-D-Ser-OH was transported across the Caco-2 cell monolayer with a Papp value of 0.35-0.69 x 10(-6) cm/s, which is comparable with the permeability of amino acids (Leu, Papp = 0.30 x 10(-6) cm/s) and dipeptides (L-Val-L-Val, Papp = 0.18 x 10(-6) cm/s) (Lennernas, H., Palm, K., Fagerholm, U., Artursson, P., 1996. Comparison between active and passive drug transport in human intestinal epithelial (Caco-2) cells in vitro and human jejunum in vivo. Int. J. Pharm. 127, 103-107; Tamura, K., Bhatnagar, P.K., Takata, J.S., Lee, C.P., Smith, P.L., Borchardt, R.T., 1996. Metabolism, uptake, and transepithelial transport of the diastereomers of Val-Val in the human intestinal cell line Caco-2. Pharm. Res. 13, 1213-1218). These studies demonstrate the techniques used to screen combinatorial libraries for permeability across Caco-2 cells and structurally identify the resulting compounds. Such methodology can be of importance in the achievement of structure-permeability relationships, useful in the design of pharmaceutically bioavailable drugs.status: publishe

Unidirectional multipulse helicity-independent all-optical switching in [Ni/Pt] based synthetic ferrimagnets (dataset)

This dataset contains all raw data and the steps to process it to the format it to produce the images found in the publication (both the main text and supplementary information) which has been accepted in PRB under the title 'Unidirectional multipulse helicity-independent all-optical switching in [Ni/Pt] based synthetic ferrimagnets'. Processing of the data is performed by running the Python files within each folder and requires the use of 'gnuplot', 'imagej' and 'latex' softwares in order to run correctly.This is the dataset used for the Sait et al. (2024) article "Unidirectional multipulse helicity-independent all-optical switching in [Ni/Pt] based synthetic ferrimagnets" published in Physical Review B

Transition metal synthetic ferrimagnets: tuneable media for all-optical switching driven by nanoscale spin current

This is the author accepted manuscript. The final version is available from the American Chemical Society via the DOI in this recordThe Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.nanolett.1c03081.All-optical switching of magnetization has great potential for use in future ultrafast and energy efficient nanoscale magnetic storage devices. So far, research was almost exclusively focused on rare-earth based materials, which limits device tunability and scalability. Here, we show that a perpendicularly magnetized synthetic ferrimagnet composed of two distinct transition metal ferromagnetic layers, Ni3Pt and Co, can exhibit helicity independent magnetization switching. Switching occurs between two equivalent remanent states with antiparallel alignment of the Ni3Pt and Co magnetic moments, and is observable over a broad temperature range. Time-resolved measurements indicate that the switching is driven by a spin-polarized current passing through the sub-nanometer Ir layer. The magnetic properties of this model system may be tuned continuously via sub-nanoscale changes in the constituent layer thicknesses as well as growth conditions, allowing the underlying mechanisms to be elucidated, and paving the way to a new class of data storage devices.Engineering and Physical Sciences Research CouncilEngineering and Physical Sciences Research CouncilEngineering and Physical Sciences Research CouncilEngineering and Physical Sciences Research CouncilSeagate Technology (Ireland)Engineering and Physical Sciences Research CouncilRoyal Academy of Engineerin

Transition metal synthetic ferrimagnets: tuneable media for all optical switching driven by nanoscale spin current

All-optical switching of magnetization has great potential for use in future ultrafast and energy efficient nanoscale magnetic storage devices. So far, research was almost exclusively focused on rare-earth based materials, which limits device tunability and scalability. Here, we show that a perpendicularly magnetized synthetic ferrimagnet composed of two distinct transition metal ferromagnetic layers, Ni3Pt and Co, can exhibit helicity independent magnetization switching. Switching occurs between two equivalent remanent states with antiparallel alignment of the Ni3Pt and Co magnetic moments, and is observable over a broad temperature range. Time-resolved measurements indicate that the switching is driven by a spin-polarized current passing through the sub-nanometer Ir layer. The magnetic properties of this model system may be tuned continuously via sub-nanoscale changes in the constituent layer thicknesses as well as growth conditions, allowing the underlying mechanisms to be elucidated, and paving the way to a new class of data storage devices