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Spin 1/2 dimer systems in an external magnetic field behave as a lattice gas of hard-core bosons, and can undergo condensation. Here the authors show in SrCu₂(BO₃)₂that new fractionally crystallized states are not only possible, but also tuneable with hydrostatic pressure.

RuCl₃ has stood out as a prime candidate in the search for quantum spin liquids; however, its antiferromagnetic ordering at low temperature suggests deviations from typical QSL models. Here, using resonant inelastic x-ray scattering, the authors provide a comprehensive determination of the low energy effective Hamiltonian.

The authors address spin–orbit torques and magnetization switching in MnPd₃/CoFeB hetrostructures.

Magnetic symmetry is a vital factor to determine exotic topological phases. Here, Riberolles et al. demonstrate a helical antiferromagnetic order in EuIn₂As₂ which makes it a magnetic topological-crystalline axion insulator.

Antiferromagnetic systems are becoming an appealing alternative for spintronic-based devices due to the more rapid magnetisation dynamics when compared to their ferromagnetic counterparts. Here, using spin dynamic simulations, the authors demonstrate that the motion of domain walls can achieve supermagnonic speeds in an antiferromagnetic system by means of generation of additional domain wall pairs.

Magnetic topological heterostructures are promising devices to manipulate emergent quantum effects. Here, Hirahara et al. fabricate a novel magnetic topological heterostructure with a massive Dirac cone which becomes a massless one tuned by temperature.

Mechanisms allowing electrical manipulation of magnetic material possess potential applications in low power memory and sensor technologies. Here, the authors demonstrate the control of magnetic characteristics via voltage-driven migration of oxygen across a GdOx/Co interface, well into the bulk of the cobalt.

The development of electronic flying qubits requires the ability to generate and control single-electron excitations. Here the authors demonstrate quantum coherence of ultrashort single-electron plasmonic pulses in an electronic Mach-Zehnder interferometer, revealing a non-adiabatic regime at high frequencies.

Multiple complementary optical signatures confirm the persistence of ferroelectricity and inversion-symmetry-breaking magnetic order down to monolayer NiI₂, introducing the physics of type-II multiferroics into the area of van der Waals materials.

Photo-excitation in strongly correlated materials is usually modelled as an increase of electronic energy that is then transferred to other degrees of freedom. Contrarily, Novelli et al.show that in a charge-transfer insulator, sub-gap excitation forms electrons that are suddenly dressed by the boson field.

Electron or hole doping in a Mott insulator leads to superconductivity, with the mechanism obscured by multi-orbital Fermi surface reconstructions. Here, Kawasugi et al. report doping dependent Hall coefficients and resistivity anisotropy of an organic Mott insulator, revealing doping asymmetry of reconstructed Fermi surface of a single electronic orbital.

The strong interaction between electron spin and orbital degrees of freedom in 5d oxides can lead to exotic electronic ground states. Here the authors use resonant inelastic X-ray scattering to demonstrate that the theoretically proposed J _eff = 3/2 state is realised in GaTa₄Se₈.

Detailed neutron scattering, magnetic susceptibility and muon spin relaxation studies indicate the absence of long-range magnetic order in the quantum magnet TbInO₃ down to 0.46 K— an observation consistent with quantum spin liquid behaviour.

Ferroic domain walls are nano-objects that are considered functional elements in future devices. Here, the authors study phonons across ferroelastic domain walls by synchrotron-based near-field infrared nano-spectroscopy and relate these changes to the order parameter which helps to understand domain wall dynamics.

A strong Hall effect is observed in a material with spin textures and strong electron correlations. This hints that correlation effects can amplify real-space topological spin transport.

Whilst terahertz optical spectroscopy allows for the study of coupled spin and lattice excitations, it is limited in momentum space. Here, the authors use inelastic x-ray scattering to demonstrate strong magnon-phonon coupling and electromagnon excitations across the Brillouin zone of LiCrO₂.

Theoretically predicted fractional antiferromagnetic skyrmions are experimentally realized in MnSc₂S₄ and are found to originate from anisotropic couplings over nearest neighbours in the crystal lattice.

In most unconventional superconductors, the superconducting phase is adjacent to a phase with some type of magnetic order. However, this is not a universal feature. For example, no magnetic order has so far been observed in Sr₂RuO₄. Now, low-energy muon relaxation experiments show the presence of a static magnetic order for this material, suggesting that this feature may in fact be universal.

Nanoscale magnetic skyrmions that are generated in metallic multilayers using on-chip heating diffuse from hot to cold regions and can be thermoelectrically detected via the Nernst voltage.

Electrical control of the spin degree of freedom has enabled various vital applications in modern electronic devices, ranging from magnetoelectronics and spintronics to high-frequency devices. We demonstrate a new approach to ‘write’ enhanced magnetization in a single-phase multiferroic thin film by the application of an electric field. The induced magnetization can be controlled with nanoscopic precision via the assistance of scanning probe techniques, thus offering high potential for use in multifunctional, low power consumption and green nanoelectronics.

BiFeO₃ has a wide application but the impact of rare-earth substitution for the evolution of the coupling mechanism is unknown. Here, the authors reveal the correlation between ferroelectricity, antiferromagnetism, a weak ferromagnetic moment, and their switching pathways in La-substituted BiFeO₃.

The labyrinthine domain patterns formed in ultrathin films of ferroelectric oxides by subcritical quenching undergo an inverse phase transition to the less-symmetric parallel-stripe domain structure upon increasing temperature.

At a zero-temperature phase transition, quantum, rather than thermal, fluctuations determine the behaviour both at the transition and in a finite temperature ‘quantum critical’ region. Here the authors give a quantitative definition of the quantum critical region that could be applied to experimental data.

Conductive domain walls have been usually found in ferroelectric oxides. Here, the authors report on giant conductivity of domain walls and their magnetically avalanche-like expulsion event in non-oxide ferroelectric GaV₄S₈, extending the source of phenomena beyond the realm of oxide electronics.

Single crystalline membranes enable the tuning of materials properties via strain states that are not accessible to bulk crystals or epitaxially clamped films. Here, the authors demonstrate the synthesis and strain gradient-induced magnetism in membranes of the Heusler compound GdPtSb.

In addition to the structural chirality of materials, there has recently been a rise in interest in the chirality arising from their magnetic and electronic structure. Using a spatially resolved resonant X-ray diffraction technique, a helical arrangement of the Dy 4f quadrupole moments in the ferroborate system DyFe₃(BO₃)₄ is uncovered.

Multiferroics offer intriguing opportunities for sensing and information storage applications, although their integration into electronic devices has been difficult owing to a lack of suitable electronic control. Electric modulation of conduction is now achieved for a doped multiferroic, resulting in complete control over the ferroelectric state itself.

An analysis of skyrmion dynamics at different temperatures and electric drive currents is used to develop a complete description of the skyrmion Hall angle in ferromagnetic multilayers from the creep to the flow regime and illustrates that skyrmion trajectories can be engineered for device applications.

Complex many-body systems may contain numerous metastable states, making it very challenging to identify the ground state. Here, a computational method based on genetic tunneling is presented and demonstrated to identify efficiently the ground state in two-dimensional magnetic topological spin systems.

Exchange coupling between ferromagnetic and multiferroic materials is a key to magnetoelectric devices but hard to achieve macroscopically. Here, the authors report room–temperature robust and reproducible magnetoelectric switching in Co/BiFeO3 heterostructures with monodomain properties over the entire sample at room temperature.

Chiral magnetic domain-wall (DW) speed variation is investigated. We demonstrate that the symmetric contribution in the DW speed attributes to the chiral DW energy density. Next, by deducing this symmetric contribution, the additional asymmetry was extracted. The extracted additional asymmetry exhibits truly antisymmetric nature and is governed by DW chirality. Moreover, this antisymmetry (additional asymmetry) changes overall DW speed more than a factor of 100 to the extent of dominating the symmetric contribution. These findings not only provide the artifact-free Dyzaloshinskii–Moriya interaction measurement scheme, but also contribute to the investigation of the origin of the additional asymmetry.

Single isolated magnetic skyrmions can be electrically written and deleted at room temperature in a magnetic device with a technologically relevant stripline geometry, a process that can be directly observed using time-resolved X-ray pump–probe measurements.

Surface engineering is an attractive route to tune the processability, stability and functionalities of 2D materials, but typically introduces defects in the resulting structures. Now, the issue has been circumvented through pre-synthetic functionalization instead; an isoreticular family of robust layered coordination polymers has been mechanically exfoliated to give functionalized crystalline magnetic monolayers.

The Mollow triplet, originally observed in the fluorescence spectrum of an optically excited two level system, is a signature of quantum electrodynamics. Here, the authors observe its phononic equivalent by magnetically coupling a single nitrogen-vacancy qubit to the vibrations of a silicon carbide nanowire.

An exchange bias phenomenon not present in bulk ferromagnetic systems is now observed at the Fe/MgO interface.

Electric-field-induced cracks are generally detrimental to functionality of ferroelectric ceramics. Liu et al. use an intermetallic alloy and ferroelectric oxide junction to mediate the reversible formation of cracks at nanoscales, resulting in colossal electroresistance modulation for memory applications.

Thermoelectric devices enable heat-electricity conversion, but achieving a large Nernst effect typically requires strong magnetic fields. Here, the authors demonstrate that YbMnBi₂, with its unique band topology and magnetic order, exhibits a remarkably high anomalous Nernst thermopower among magnetic materials, offering a promising route for efficient transverse thermoelectric applications.

A detailed and systematic study of Ca₁₀Cr₇O₂₈ reveals all the hallmarks of spin-liquid behaviour, in spite of the compound’s unusually complex structure.