All-electrical switching of a topological non-collinear antiferromagnet at room temperature.

Non-collinear antiferromagnetic Weyl semimetals, combining the advantages of a zero stray field and ultrafast spin dynamics, as well as a large anomalous Hall effect and the chiral anomaly of Weyl fermions, have attracted extensive interest. However, the all-electrical control of such systems at room temperature, a crucial step toward practical application, has not been reported. Here, using a small writing current density of around 5 × 10 A·cm, we realize the all-electrical current-induced deterministic switching of the non-collinear antiferromagnet MnSn, with a strong readout signal at room temperature in the Si/SiO/MnSn/AlO structure, and without external magnetic field or injected spin current.

Observation of the nonlinear Hall effect under time-reversal-symmetric conditions.

The electrical Hall effect is the production, upon the application of an electric field, of a transverse voltage under an out-of-plane magnetic field. Studies of the Hall effect have led to important breakthroughs, including the discoveries of Berry curvature and topological Chern invariants. The internal magnetization of magnets means that the electrical Hall effect can occur in the absence of an external magnetic field; this 'anomalous' Hall effect is important for the study of quantum magnets.

Magnetoresistance Anomaly in Topological Kondo Insulator SmB Nanowires with Strong Surface Magnetism.

Topological Kondo insulators (TKIs) are a new class of topological materials in which topological surface states dominate the transport properties at low temperatures. They are also an ideal platform for studying the interplay between strong electron correlations and topological order. Here, hysteretic magnetoresistance (MR) is observed in TKI SmB thin nanowires at temperatures up to 8 K, revealing the strong magnetism at the surface of SmB.