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The discover of van der Waals materials that retain magnetic ordering down to monolayers has fostered considerable interest, however, these materials are often hampered by poor environmental stability. Here, Tschudin, Broadway and coauthors study the magnetic properties of CrSBr, using NV-center based magnetometry, detailing magnetization reversal under applied magnetic fields

Spin-waves have a variety of advantages for information processing, and here, Chen, Xu and coauthors demonstrate the deterministic switching of antiferromagnetic spin textures using non-linear spin-waves. The switching process is progressive, mirroring weighted sum operations in neuromorphic computing.

Magnetoelectric coupling allows switching of magnetic states via gate voltage pulses. Here the authors propose and demonstrate a purely antiferromagnetic magnetoelectric random access memory based on Cr₂O₃, reporting 50-fold reduction of writing threshold compared to ferromagnetic counterparts.

Coherent driving of all transitions of a three-level system generates a closed-contour interaction, which is here shown to create efficient manipulation methods for electronic spins in nitrogen–vacancy centres in diamond.

Directly embedding single nitrogen–vacancy centres into ordered arrays of plasmonic nanostructures can enhance their radiative emission rate and thus give greater scalability over previous bottom-up approaches for the realization of on-chip quantum networks.

Diract imaging of supercurrent flow at a Josephson junction has been inaccessible in experiment. Here, using nanoscale magnetometry, the authors find large kinetic inductance of thin film superconductors can lead to competing Josephson vortex states hidden below the critical current, and also provide a new route towards the Josephson diode effect.

CrSBr is a van der Waals layered antiferromagnet. Unlike many other van der Waals magnetic materials it is air stable, and in addition hosts a rich array of magneto-optical responses. Here, Tabataba-Vakili et al demonstrate that the magnetic and optical response of CrSBr is sensitive to gating, allowing electrical control of the magneto-optical properties.

Long-distance magnon transport is highly desired for magnonics. Here, the authors demonstrate a millimetre-long magnon decay length in multiferroic heterostructures, which is attributed to magnon-polarons induced by the magnetoelastic coupling.

There has been substantial interest in using magnons for information processing. At low magnetic fields, many magnets can form complex domain structures. Here, Li et al study how magnons propagate in a ferrimagnet with domains, finding that the passage of magnons is remarkably insensitive to this complex domain landscape.

Flexomagnetism refers to the modification of the magnetic properties of a material due to inhomogeneous strain, and offers a promising pathway to the control and manipulation of magnetism. Here, Makushko et al. explore flexomagnetism in antiferromagnetic thin films of Cr₂O₃, demonstrating a gradient of the Néel temperature as a result of an inhomogeneous strain.

High-resolution magnetometry shows that the shape of domain walls in Cr₂O₃ is determined by the energetic cost of their surface area. The walls behave like elastic surfaces that avoid thicker parts of the sample where they would need to be larger.

The efficient and robust manipulation of single spins is an essential requirement for successful quantum devices. The manipulation of a single nitrogen–vacancy spin centre is now demonstrated by means of a mechanical resonator approach.

High-spatial-resolution magnetometry at cryogenic temperature can be achieved with nitrogen–vacancy centres, allowing detailed imaging of Pearl vortices in the cuprate superconductor YBa₂Cu₃O_7−δ.

The sensitivity of a magnetometer based on a nitrogen–vacancy centre can be enhanced by three orders of magnitude by using a ferromagnetic nanoparticle.

Proximity-induced chiral quantum emission is generated by applying nanoindentation on monolayer WSe₂ on an antiferromagnetic van der Waals material (NiPS₃) at zero external magnetic fields, reporting a degree of circular polarization of 0.89 and a single-photon purity of 95%.

Nitrogen vacancy centre quantum sensors are quantitative, non-invasive and physically robust probes of condensed matter systems that offer nanoscale resolution across a wide range of temperatures. This Technical Review discusses the connections between NV measurements and important physical characteristics in condensed matter.