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The propagation dynamics of skyrmions in three dimensions have attracted increasing attention. Here, the authors demonstrate the coherent and non-reciprocal propagation of spin excitations along skyrmion strings for the chiral-lattice magnet Cu₂OSeO₃ over a distance exceeding 50 μm.

Skyrmions, a type of topological spin texture, have been proposed for both storing and processing information. Central to this is the ability to manipulate the skyrmions, while at the same time ensuring their stability. Here, Ran, Tan, Sun and coauthors observe the bending of skyrmion strings under a thermal gradient, providing key evidence for the existence of magnon friction.

The observation of three new classes of domain wall demonstrates the importance of topological disclination and dislocation defects in the helimagnet iron germanium, via analogy with grain boundaries in cholesteric liquid crystals.

The dynamic properties of Néel skyrmions in magnetic thin films have remained elusive. Here, the authors report distinct resonances in Ir/Fe/Co/Pt heterostructures whose frequencies vary with the skyrmion configuration and multilayer architecture, thus opening a path to microwave applications.

An experiment demonstrates that the motion of so-called skyrmions—topologically quantized magnetic whirls—causes an emergent electric field that inherits the topological quantization of the skyrmions and is directly visible in the Hall effect.

The resonant microwave excitation response of metals, semiconductors and insulating chiral magnets is studied by examining their entire magnetic phase diagrams, which includes the skyrmion lattice phase. A unified model to explain this response is also developed.

A new type of skyrmion is identified in the chiral magnetic material Cu₂OSeO₃ at low temperature. This is the first time that a single material has been shown to exhibit more than one distinct skyrmion phase.

Topological defects may strongly influence the evolution of a materials' micromagnetic structure whilst their manipulation forms the basis for emerging technological concepts. Here, the authors study the depinning and motion of magnetic edge dislocations in the domain structure of helimagnetic FeGe.

Topological magnon bands in magnetic skyrmion lattices offer robust, unidirectional edge transport, crucial for advancing magnonic circuits and quantum transport studies. Here, Brillouin light scattering microscopy is used to detect intermediate wavelength magnons in Cu₂OSeO₃, revealing multipole excitation modes with inactive dipole character, including a novel quadrupole mode and, possibly, a sextupole mode, enhancing GHz frequency magnonic device design.

Investigation of Zea mays (maize, corn) pollen cellular respiration and pollen-silk (stigma) interactions leads to the development of an accessible protocol that can preserve maize pollen viability for up to seven days at a hybrid seed production scale.

CRISPR-Cas systems have well characterized, modular structures. Here the authors use that architecture to design a Cas12a library of 560 synthetic chimeras, with altered PAM preferences and specificities.

T-junctions are a tool for droplet generation; they are well-described by models that distinguish for squeezing and jetting regimes for different capillary numbers. By considering the usually neglected corner flow, the authors identify an additional leaking regime for very low capillary numbers.

The non-Fermi-liquid regime that emerges in MnSi under high pressures displays a Hall signal that can be traced to topologically non-trivial spin configurations at low pressures — a well-understood skyrmion lattice — empirically suggesting a route towards a breakdown of Fermi liquid theory in pure metals.

Magnetic skyrmions are topological objects that have been recently extensively studied for their particular characteristics and a view to be used in spintronics devices. The authors present a Small Angle Neutron Scattering study of the deformation of magnetic skyrmion lattice propelled by an electric current and find that the skyrmions experience frictional movement at the edges of their sample providing better understanding of the motion of skyrmions.

By means of a sensitive neutron spectroscopy approach the magnetic excitations in the heavy fermion superconductor CeRhIn₅ are probed, revealing a uniaxial anisotropy that can be tuned with an external magnetic field.

This Primer by Wannier and colleagues summarizes the methodology, analysis and utility of recombineering and multiplex automated genome engineering (MAGE) in microbial species. In addition, this Primer examines advanced techniques that pair MAGE with other tools to improve editing efficiency.

Magnetic skyrmions are nanosized and topologically-protected objects that exhibit well-controlled motion under applied current making them prime candidates for race-track memories. The author’s study skyrmion lattice creep that is detrimental for memory applications using ultrasound spectroscopy.