Publications by authors named "A Masseboeuf"
Magnetic skyrmions are topological spin textures which are envisioned as nanometer scale information carriers in magnetic memory and logic devices. The recent demonstrations of room temperature skyrmions and their current induced manipulation in ultrathin films were first steps toward the realization of such devices. However, important challenges remain regarding the electrical detection and the low-power nucleation of skyrmions, which are required for the read and write operations.
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- Researchers developed new types of probes made from all-graphenic carbon morphologies attached to individual carbon nanotubes, which may enhance scanning probe microscopy (SPM) techniques.
- They tested three methods for mounting these probes, two involving focused ion/electron beams and one using an optical microscope, highlighting the pros and cons of each method.
- Analysis showed the carbon cone structures were highly sensitive to ion and electron irradiation, likely due to many free graphene edges, suggesting that these carbon cones could outperform traditional probes like silicon or diamond in SPM applications.
The metal-oxide-semiconductor (MOS) capacitor is one of the fundamental electrical components used in integrated circuits. While much effort is currently being made to integrate new dielectric or ferroelectric materials, capacitors of silicon dioxide on silicon remain the most prevalent. It is perhaps surprising therefore that the electric field within such a capacitor has never been measured, or mapped out, at the nanoscale.
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- - The study involves creating graphene-based carbon micro/nano-cones using a chemical vapor deposition method on carbon nanotubes and examining them with advanced microscopy and modeling techniques.
- - The results showed that the cones have a scroll-like texture, with parallel scroll turns and a common helicity vector, allowing for possible coherent stacking despite curvature-induced lattice shifts.
- - A unique graphene termination defect, termed the "zip" defect, was identified at the cone apexes, leading to a low Raman band ratio, and the findings contributed to a chart categorizing various defects affecting graphene structures.
Perpendicular shape anisotropy (PSA) offers a practical solution to downscale spin-transfer torque magnetoresistive random-access memory (STT-MRAM) beyond the sub-20 nm technology node while retaining thermal stability. However, our understanding of the thermomagnetic behavior of PSA-STT-MRAM is often indirect, relying on magnetoresistance measurements and micromagnetic modeling. Here, the magnetism of a NiFe PSA-STT-MRAM nanopillar is investigated using off-axis electron holography, providing spatially resolved magnetic information as a function of temperature.
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