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Topology created by quasi-continuous spatial variations of a local polarization direction represents an exotic state of matter, but field-driven manipulation has been hitherto limited to creation and destruction. Here we report that relatively small electric or mechanical fields can drive the non-volatile rotation of polar spirals in discretized microregions of the relaxor ferroelectric polymer poly(vinylidene fluoride-ran-trifluoroethylene). These polar spirals arise from the asymmetric Coulomb interaction between vertically aligned helical polymer chains, and can be rotated in-plane through various angles with robust retention. Given also that our manipulation of topological order can be detected via infrared absorption, our work suggests a new direction for the application of complex materials.
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http://dx.doi.org/10.1038/s41467-023-44395-5 | DOI Listing |
Int J Biol Macromol
September 2025
State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemistry Science and Engineering, Tianjin 300072, China. Electronic address:
This work applies cellulose-based nanofilm as the platform to design a kind of stretching-responsive circularly polarized luminescence (CPL) material. Hierarchical structure photonic crystal material is prepared through the co-assembly of cellulose nanocrystals (CNCs) and poly(vinyl alcohol) (PVA) additive. By optimizing the amounts of PVA, the composite film presents high tensile strength (61.
View Article and Find Full Text PDFMembranes (Basel)
July 2025
Department of Civil, Chemical, Environmental and Materials Engineering-DICAM, Alma Mater Studiorum University of Bologna, Via Terracini 28, 40131 Bologna, Italy.
This study presents data from Reverse Osmosis (RO) and Nanofiltration (NF) spiral-wound polyamide modules tested in a semi-pilot plant with multicomponent mixtures of Volatile Fatty Acids (VFAs) comprising acetic, propionic, butyric, valeric, and hexanoic acids. A robust method combining film theory and dissociation equilibria was developed to estimate interfacial concentrations, enabling accurate analysis of concentration polarization, real rejection, and effective transmembrane driving force. Concentration polarization strongly affects NF membranes, resulting in real rejections up to 20% higher than apparent values, while its effect is negligible for RO membranes.
View Article and Find Full Text PDFAdv Sci (Weinh)
August 2025
Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China.
Unlike conventional magnetic states, which lack degeneracy, the spiral spin liquid (SSL) fluctuates among degenerate spiral configurations, with ground-state wave vectors forming a continuous contour or surface in reciprocal space. At low temperatures, the field-induced crossover from the polarized ferromagnetic state to the SSL results in a large entropy increase and decalescence, indicating its potential for magnetic cooling. However, magnetic cooling using a SSL has yet to be reported.
View Article and Find Full Text PDFPhys Chem Chem Phys
August 2025
College of Integrative Studies, Abdullah Al Salem University (AASU), Block 3, Khaldiya, Kuwait.
We present a comprehensive micromagnetic investigation of the spin textures and magnetization dynamics in a thin multi-ferroic CoC MXene flake subjected to external magnetic fields ranging from 0 T to 8 T. At zero field, the system exhibits a complex spin spiral structure, indicative of strong competing magnetic interactions. As the applied magnetic field increases, the spin configurations undergo a continuous topological transition-from a skyrmion lattice to a uniformly magnetized ferromagnetic phase.
View Article and Find Full Text PDFPhys Rev Lett
July 2025
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
Transient plasma evolution with spin polarization dynamics in radiation reaction dominated magnetic reconnection is investigated using particle-in-cell simulations. We identify a condensation of plasmoids accumulated into multiple tiny islands within the reconnection layer, where electrons are strongly polarized while emitting energetic γ-ray photons to undergo radiative spin flips. Nonlinear analyses elucidate that the condensation is caused by a spiral attractor appearing in the electron's phase space due to radiation reaction.
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