4,059 research outputs found
Magnetic Switching in BPM, TEAMR, and Modified TEAMR Using Dielectric Underlayer Media
In this paper, we study the coercivity of bit-patterned media, trapping electron-assisted magnetic recording (TEAMR), and modified TEAMR (M-TEAMR) media using a dielectric underlayer. The VAMPIRE magnetic simulator is used to model three structures of recording bits and to study the M - H loops using an atomistic spin model. The results show that the magnetic switching reduction in M-TEAMR and TEAMR depends on the bit size. The percentage of magnetic switching reduction in M-TEAMR is also larger than TEAMR for all bit sizes. For a bit size of 1.6× 1.6 × 3.2 nm3, the percentage of magnetic switching reduction in M-TEAMR is approximately four times higher than that in TEAMR
On Writ of Certiorari to the United States Court of Appeals for the Ninth Circuit, Brief of Product Liability Advisory Council, Inc., National Association of Manufacturers, Business Roundtable, and Chemical Manufacturers Association as Amici Curiae in Support of Respondent, William Daubert and Joyce Daubert, Individually and as Guardians Ad Litem for Jason Daubert, and Anita De Young, Individually and as Gaurdian Ad Litem for Eric Schuller v. Merrell Dow Pharmaceuticals, Inc.
The Federal Rules of Evidence exclude expert scientific testimony when it has been developed without regard for accepted scientific methods.
This case focuses on expert scientific evidence. Such evidence plays a vital and often dispositive role in modern litigation. For scientific evidence to be helpful to the factfinder it must meet some minimal threshold of reliability. To hold otherwise would be to allow a system of adjudication based more on chance than on reason
Lipid coated liquid crystal droplets for the on-chip detection of antimicrobial peptides
We describe a novel biosensor based on phospholipid-coated nematic liquid crystal (LC) droplets and demonstrate the detection of Smp43, a model antimicrobial peptide (AMP) from the venom of North African scorpion Scorpio maurus palmatus. Mono-disperse lipid-coated LC droplets of diameter 16.7 ± 0.2 μm were generated using PDMS microfluidic devices with a flow-focusing configuration and were the target for AMPs. The droplets were trapped in a bespoke microfluidic trap structure and were simultaneously treated with Smp43 at gradient concentrations in six different chambers. The disruption of the lipid monolayer by the Smp43 was detected (<6 μM) at concentrations well within its biologically active range, indicated by a dramatic change in the appearance of the droplets associated with the transition from a typical radial configuration to a bipolar configuration, which is readily observed by polarizing microscopy. This suggests the system has feasibility as a drug-discovery screening tool. Further, compared to previously reported LC droplet biosensors, this LC droplet biosensor with a lipid coating is more biologically relevant and its ease of use in detecting membrane-related biological processes and interactions has the potential for development as a reliable, low-cost and disposable point of care diagnostic tool
Relativistic domain-wall dynamics in van der Waals antiferromagnet MnPS3
The discovery of two-dimensional (2D) magnetic van der Waals (vdW) materials has flourished an endeavor for fundamental problems as well as potential applications in computing, sensing and storage technologies. Of particular interest are antiferromagnets, which due to their intrinsic exchange coupling show several advantages in relation to ferromagnets such as robustness against external magnetic perturbations. Here we show that, despite of this cornerstone, the magnetic domains of recently discovered 2D vdW MnPS3 antiferromagnet can be controlled via magnetic fields and electric currents. We achieve ultrafast domain-wall dynamics with velocities up to ~3000 m s−1 within a relativistic kinematic. Lorentz contraction and emission of spin-waves in the terahertz gap are observed with dependence on the edge termination of the layers. Our results indicate that the implementation of 2D antiferromagnets in real applications can be further controlled through edge engineering which sets functional characteristics for ultrathin device platforms with relativistic features
Properties and dynamics of meron topological spin textures in the two-dimensional magnet CrCl3
Merons are nontrivial topological spin textures highly relevant for many
phenomena in solid state physics. Despite their importance, direct observation
of such vortex quasiparticles is scarce and has been limited to a few complex
materials. Here we show the emergence of merons and antimerons in recently
discovered two-dimensional (2D) CrCl3 at zero magnetic field. We show their
entire evolution from pair creation, their diffusion over metastable domain
walls, and collision leading to large magnetic monodomains. Both quasiparticles
are stabilized spontaneously during cooling at regions where in-plane magnetic
frustration takes place. Their dynamics is determined by the interplay between
the strong in-plane dipolar interactions and the weak out-of-plane magnetic
anisotropy stabilising a vortex core within a radius of 8-10 nm. Our results
push the boundary to what is currently known about non-trivial spin structures
in 2D magnets and open exciting opportunities to control magnetic domains via
topological quasiparticles.Comment: Nature Communications 12, 185 (2021). Editors' Highlights sectio
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