Field-like spin–orbit torque induced by bulk Rashba channels in GeTe/NiFe bilayers

Most studies of the Rashba effect have focused on interfacial Rashba spin–orbit coupling. Recently, bulk Rashba materials have attracted considerable interest owing to their potential to enhance the Rashba spin–orbit torque. By employing a bulk Rashba material, GeTe, as a spin–orbit channel in GeTe/NiFe bilayers, a large field-like spin–orbit torque up to 15.8 mT/(107 A cm−2) is measured. This value is one of the largest reported field-like torques and is attributed to the interfacial spin–orbit coupling being enhanced by the bulk Rashba effect in the GeTe channel. Furthermore, the large field-like torque is maintained even for a 20-nm-thick NiFe layer. This unconventional dependence on the thickness of both the GeTe and NiFe layers cannot be described by conventional theory, but it is believed to stem from the additional bulk Rashba effect-induced term. The large field-like torque over a wide range of ferromagnet thicknesses results in scalable in-plane spin–orbit torque devices. This result calls for a further theoretical study on spin transport in heterostructures, including bulk Rashba materials.

Boosting the electrocatalytic performance of NiFe layered double hydroxides for the oxygen evolution reaction by exposing the highly active edge plane (012)

The (012) edge plane of NiFe layer double hydroxides (LDHs) has been proven to be a highly active plane for water oxidation.

TECHNOLOGY AND MEASUREMENTS OF MAGNETORESISTANCE IN THIN-LAYERED FERROMAGNETIC STRUCTURES

The paper presents the technology for obtaining NiFe/Ti/NiFe layer structures in MEMS technology using magnetron purge with the assumption of being used as semi-magnetic sensors. A series of samples was made on a glass substrate with a sandwich structure, where the individual layers were 100 nm NiFe, 10 nm Ti and on top again NiFe with a thickness of 100 nm. Measurements of DC resistance of the obtained structures in a constant magnetic field, which was produced by neodymium magnets and an electromagnet, were carried out. The obtained results confirm the occurrence of phenomena known as the magnetoresistance effect. The influence of the spatial arrangement of structures relative to the constant magnetic field vector was checked and proved.

Autogenous growth of the hierarchical V-doped NiFe layer double metal hydroxide electrodes for an enhanced overall water splitting

V-NiFe-LDH/NF are applied to promote the electronic conductivity and achieve efficient electrocatalysis for overall water splitting. The doping effect and defects reduced the overpotential and accelerated the initial kinetics of the catalytic process.

Engineering borate modified NiFe layer double hydroxide nanoarrays as “hydroxyl ions hungry” electrocatalysts for enhanced oxygen evolution

A simple and facile “hydroxyl ions hungry” electrode structure was prepared by a two-step hydrothermal reaction to obtain BA-NiFe-LDHs/CP. It exhibited excellent OER catalytic activity.