Ferromagnetism articles from across Nature Portfolio

Fractional Chern insulators have been observed in moiré MoTe₂ at zero magnetic field, but the expected zero longitudinal resistance has not been demonstrated. Now it is shown that improving device quality allows this effect to appear.

Optical control of integer and fractional Chern insulators is demonstrated by circularly polarized optical pumping in tMoTe₂.

Optical spin orientation of itinerant ferromagnets in twisted MoTe₂ homobilayers is demonstrated, enabling control of topological Chern numbers with circularly polarized light.

Coherent spin waves—quantized into magnons—can be emitted as Cherenkov radiation, but their experimental realization is hindered by the lack of fast-moving magnetic perturbations. Now, a picosecond strain pulse is shown to induce this effect.

The authors predict 2D CuMnP₂Se₆ where a tiny electric field ( ~ 0.001 V/Å) flips in-plane polarization and switches magnetism from antiferromagnetic to ferromagnetic, enabling ultralow-power spintronic memories.

The insertion of thin cobalt layers increases the thermal stability of β-tungsten. Using this composite as the spin current source in a 64-kb spin–orbit torque magnetic random-access memory array enables back-end-of-line process compatibility and efficient magnetization switching — achieving 1 ns switching, data retention of more than 10 years and 146% tunnelling magnetoresistance.

Shear stress, induced by the tip of an atomic force microscope, stabilizes ferroelastic domain variants and thereby reversibly controls magnetic microstructure and magnetotransport behaviour in thin-film oxides.

Scanning tunnelling microscopy experiments enable the realization of artificially built topological quantum magnets with titanium atoms and graphene goblets.

Spin-squeezed states are a resource for quantum-enhanced precision measurement. However, the theoretical foundations for scalable spin squeezing — where quantum enhancement grows with system size — have only been established for systems exhibiting all-to-all interactions. Now, by unveiling a connection to finite-temperature magnetism, scalable squeezing is extended to locally interacting systems.

Rhombohedral graphene is an emerging material with a rich correlated-electron phenomenology, including superconductivity. The magnetism of symmetry-broken trilayer graphene has now been explored, revealing important details of the physics and providing a roadmap for broader explorations of rhombohedral graphene.

As counterparts to optical frequency combs, magnonic frequency combs could have broad applications if their initiation thresholds were low and the ‘teeth’ of the comb plentiful. Progress has now been made through exploiting so-called exceptional points to enhance the nonlinear coupling between magnons and produce wider magnonic frequency combs.