The high ring strain of cyclic hydrocarbons enables alternating copolymerization with carbon dioxide to produce polyesters amenable to closed-loop recycling.
Magnonic circuits that use spin waves for nanoscale signal processing and computing are widely regarded as a promising alternative to traditional semiconductor electronics. However, a key missing component of this information nanotechnology is a feasible approach for the integration of memory directly into spin-wave devices. Here we propose a strategy for the implementation of built-in non-volatile memory, which uses the static magnetization states of waveguiding elements within a magnonic network fabricated from a low-loss magnetic insulator and operating at zero bias magnetic field. We show that switching the magnetization direction in these elements enables efficient control over spin-wave propagation paths. Furthermore, we suggest an approach to achieve low-energy selective magnetization switching in such systems. Our results open new possibilities for the realization of advanced, self-contained magnonic nano-circuits. Ferrimagnetic nanostructures with low spin-wave damping are used to demonstrate the reprogrammable routing of spin-wave signals across a wide range of frequencies.
Gene expression reconstituted outside the cell controls the composition and dynamics of cytoskeletal networks, bringing the tools of synthetic biology to active matter and opening a route to genetically programmed biomaterials.
Metal-free molecular magnets differ from conventional magnetic devices that predominantly rely on metallic magnets as these metal-free materials may offer biocompatibility and bioresorbability. However, existing molecular materials lack the ferromagnetic strength required for high-fidelity sensing at clinically relevant tissue depths. Here we introduce a bioresorbable metal-free molecular magnet derived from graphitic carbon nitride, combining metallic-level ferromagnetism with full bioresorbability. De-nitrogenation creates spin centres coupled through a reconstructed π–σ conjugated framework, conferring robust spontaneous magnetization that remains stable under physiological conditions. Integrated with poly(lactic-co-glycolic acid) and silk fibroin, the material forms catheter-deliverable epicardial patches for cardiac tracking and can also be dispersed in injectable hydrogels for organ-scale sensing, including the three-dimensional reconstruction of localized hepatic pathologies. Coupled with a skin-interfaced Hall array, this magnetic sensing architecture provides the continuous, untethered monitoring of multi-organ dynamics, robust against motion artifacts and tissue impedance. In porcine models, it facilitates the continuous assessment of ejection fraction over 4 weeks, followed by benign bioresorption. Benchmarked against standard-of-care echocardiography, this approach delivers clinical-grade trajectories, supporting longitudinal, infrastructure-independent physiological monitoring. A bioresorbable, metal-free molecular magnet for wireless deep-tissue sensing is reported that enables continuous cardiac monitoring and injectable organ tracking in vivo before the material safely degrades.
Strong coupling between magnons and excitons in CrSBr enables microwave-to-optical transduction, offering a route towards efficient conversion between otherwise disparate frequency regimes.
