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| http://dx.doi.org/10.4103/jmu.jmu_68_22 | DOI Listing |
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Creating and Deleting a Single Dipolar Skyrmion by Surface Spin Twists.
Nano Lett
January 2025
Anhui Province Key Laboratory of Low-Energy Quantum Materials and Devices, High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences, Hefei, 230031, China.
We report deterministic operations on single dipolar skyrmions confined in nanostructured cuboids by using in-plane currents. We achieve highly reversible writing and deleting of skyrmions in a simple cuboid without any artificial defects or pinning sites. The current-induced creation of skyrmions is well-understood through the spin-transfer torque acting on surface spin twists of the spontaneous 3D ferromagnetic state, caused by the magnetic dipole-dipole interaction of the uniaxial FeSn magnet with a low-quality factor.
View Article and Find Full Text PDFA rare case report of ileosigmoid knots that cause intestinal obstruction during Ramadan fasting.
Int J Surg Case Rep
January 2025
Department of Visceral and Digestive Surgery, Monastir University Hospital, Monastir, Tunisia.
Introduction And Importance: This case report aims to highlight the clinical presentation, diagnostic challenges, surgical intervention, and subsequent management strategies of ISK during Ramadan fasting.
Case Presentation: 52-Year-old male with a three-day history of symptoms of intestinal obstruction. He complained of abdominal distention, vomiting, and absolute constipation.
Intertwined Flexoelectricity and Stacking Ferroelectricity in Marginally Twisted hBN Moiré Superlattice.
Adv Mater
November 2024
School of Physics and Materials Science, Nanchang University, Nanchang, 330031, China.
Moiré superlattices in twisted van der Waals homo/heterostructures present a fascinating interplay between electronic and atomic structures, with potential applications in electronic and optoelectronic devices. Flexoelectricity, an electromechanical coupling between electric polarization and strain gradient, is intrinsic to these superlattices because of the lattice misfit strain at the atomic scale. However, due to its weak magnitude, the effect of flexoelectricity on moiré ferroelectricity has remained underexplored.
View Article and Find Full Text PDFTranscrystalline Mechanism of Banded Spherulites Development in Melt-Crystallized Semicrystalline Polymers.
Polymers (Basel)
August 2024
Department of Chemical Engineering, Biotechnology and Materials, Faculty of Engineering, Ariel University, Ariel 40700, Israel.
The decades-long paradigm of continuous and perpetual lamellar twisting constituting banded spherulites has been found to be inconsistent with several recent studies showing discontinuity regions between consecutive bands, for which, however, no explanation has been found. The present research demonstrates, in three different semicrystalline polymers (HDPE, PEG10000 and Pluronic F-127), that sequential transcrystallinity is the predominant mechanism of banded spherulite formation, heterogeneously nucleated on intermittent self-shear-oriented amorphous layers excluded during the crystals' growth. It is hereby demonstrated that a transcrystalline layer can be nucleated on amorphous self-shear-oriented polymer chains in the melt, by a local melt flow in the bulk or in contact with any interface-even in contact with the interface with air, e.
View Article and Find Full Text PDFManipulation of Moiré Superlattice in Twisted Monolayer-multilayer Graphene by Moving Nanobubbles.
Nano Lett
July 2024
School of Physics, School of Integrated Circuits and Electronics, Beijing Institute of Technology, Advanced Research Institute of Multidisciplinary Sciences, Beijing 100081, China.
In the heterostructure of two-dimensional (2D) materials, many novel physics phenomena are strongly dependent on the Moiré superlattice. How to achieve the continuous manipulation of the Moiré superlattice in the same sample is very important to study the evolution of various physical properties. Here, in minimally twisted monolayer-multilayer graphene, we found that bubble-induced strain has a huge impact on the Moiré superlattice.
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