Extra-factors-controlled ReRAM devices are expected to be used in the manufacture of multistate memory and artificial intelligent sensors.

The Weyl antiferromagnet Mn₃Sn has recently attracted significant attention as it is not only a novel magnetic quantum material of fundamental interest, but it also opens opportunities to investigate a number of exotic spin-dependent transports for practical antiferromagnetic devices. Here, we report the large spin to charge conversion observed in YIG/Mn₃Sn. Evidenced by both spin Seebeck and spin pumping measurements, the spin to charge conversion efficiency of Mn₃Sn is found ∼2.5 times of that for the conventional heavy metal Ta. Our results suggest a promising potential for employing a topological non-trivial antiferromagnet to achieve more efficient spin to charge conversion than conventional metallic materials.

The ethyl acetate extract from the seeds of Herpetospermum caudigerum was found to show protective effects on carbon tetrachloride (CCl4) and thioacetamide (TAA)-induced acute hepatic injuries in mice. From the ethyl acetate extract, two new coumarins, herpetolide A (1) and herpetolide B (2), along with four known compounds, herpetone (3), dehydrodiconiferyl alcohol (4), 2,4-dihydroxypyrimidine (5) and stigmasterol (6) were isolated. The structures of the new coumarins were elucidated on the basis of chemical and physicochemical evidences. Herpetone exhibited protective effects on CCl4-induced hepatocyte injury.

Magnonics as an emerging frontier of spintronics aims using magnons to deliver information free from electron scattering and as-induced Joule heating. In general, magnon currents can be excited both thermally and electrically in magnetic insulators by applying a current in an adjacent heavy-metal layer. Here, we report another kind of magnon junctions (MJs) composed of ${\mathrm{Y}}_3{\text{Fe}}_5{\mathrm{O}}_{12}$ /CoO/${\mathrm{Y}}_3{\text{Fe}}_5{\mathrm{O}}_{12}$ heterostructures, in which ${\mathrm{Y}}_3{\text{Fe}}_5{\mathrm{O}}_{12}$ and CoO are, respectively, ferrimagnetic and antiferromagnetic insulators. A temperature gradient can drive a high (low) magnon current via the spin Seebeck effect when the ${\mathrm{Y}}_3{\text{Fe}}_5{\mathrm{O}}_{12}$ layers in an MJ are configured at the parallel (antiparallel) state, showing a spin valve-like behavior. Electrically injected magnon current could also be controlled by the MJs, contributing to a magnon-mediate nonlocal spin Hall magnetoresistance (SMR). Furthermore, compared with its NiO counterpart, both the magnon junction and magnon-mediate SMR effects can be clearly observed at room temperature for the CoO-based magnon junctions, which can possibly be applied as a building block for room-temperature magnon-based memory or logic devices.

Diamond based quantum sensing is a fast-emerging field with both scientific and technological importance. The nitrogen-vacancy (NV) center, a crystal defect in diamond, is a unique model system for microwave sensing application due to its excellent photo-stability, long spin coherence time in ambient conditions. In this work, we systematically optimized the measurement parameters for microwave sensing. The system noise is analyzed, and 1/f noise is suppressed by introducing a differential algorithm. The gain of avalanche photodiode and the gating window of the pulsed fluorescence is optimized to further suppress the noise floor. The decoherence of spin is characterized by varying the duration of the laser and microwave. The minimal detectable power on a standard microstrip is characterized with sampling time down to 1 ms, showing flat frequency dependence. The results have important implications toward fast measurement of broadband microwave power, especially in the field of IC testing and radar signal processing under intense electromagnetic interference.