Efficient perpendicular magnetization switching by a magnetic spin Hall effect in a noncollinear antiferromagnet

Current induced spin-orbit torques driven by the conventional spin Hall effect are widely used to manipulate the magnetization. This approach, however, is nondeterministic and inefficient for the switching of magnets with perpendicular magnetic anisotropy that are demanded by the high-density magnetic storage and memory devices. Here, we demonstrate that this limitation can be overcome by exploiting a magnetic spin Hall effect in noncollinear antiferromagnets, such as Mn3Sn. The magnetic group symmetry of Mn3Sn allows generation of the out-of-plane spin current carrying spin polarization collinear to its direction induced by an in-plane charge current. This spin current drives an out-of-plane anti-damping torque providing the deterministic switching of the perpendicular magnetization of an adjacent Ni/Co multilayer. Due to being odd with respect to time reversal symmetry, the observed magnetic spin Hall effect and the resulting spin-orbit torque can be reversed with reversal of the antiferromagnetic order. Contrary to the conventional spin-orbit torque devices, the demonstrated magnetization switching does not need an external magnetic field and requires much lower current density which is useful for low power spintronics

Micro-selection and Macro-orientation Strategy Enables High-Areal-Capacity Magnesium Metal Anode

Developing magnesium (Mg) metal electrodes for extended cycling at practical areal capacities is crucial for the commercialization of Mg battery commercialization. However, a higher areal-capacity operation requires greater Mg nucleation ability, which is further complicated by the fact that Mg faces a higher desolvation barrier than Li. This study investigates the correlation between the operated areal capacity and a short circuit. Accelerated lifespan degradation (670 to 15 h) occurs with increased areal capacity due to a short circuit from uneven Mg plating. Using insights, a micro-selection and macro-orientation strategy inspired by glass fiber-MXene (GF-MXene) substrate is developed for controlling Mg plating/stripping at high areal capacity. Synchronous morphological analysis reveals selective Mg plating on microscale MXene sheets and oriented plating/stripping in the macroscopic substrate greatly mitigates short circuiting, delivering high Coulombic efficiency (∼99.4%) for 700 h under 2.5 mAh cm–2 and extended cycle life (340 h) at 5 mAh cm–2, providing practical possibilities for Mg metal anodes applications

Micro-selection and Macro-orientation Strategy Enables High-Areal-Capacity Magnesium Metal Anode

Developing magnesium (Mg) metal electrodes for extended cycling at practical areal capacities is crucial for the commercialization of Mg battery commercialization. However, a higher areal-capacity operation requires greater Mg nucleation ability, which is further complicated by the fact that Mg faces a higher desolvation barrier than Li. This study investigates the correlation between the operated areal capacity and a short circuit. Accelerated lifespan degradation (670 to 15 h) occurs with increased areal capacity due to a short circuit from uneven Mg plating. Using insights, a micro-selection and macro-orientation strategy inspired by glass fiber-MXene (GF-MXene) substrate is developed for controlling Mg plating/stripping at high areal capacity. Synchronous morphological analysis reveals selective Mg plating on microscale MXene sheets and oriented plating/stripping in the macroscopic substrate greatly mitigates short circuiting, delivering high Coulombic efficiency (∼99.4%) for 700 h under 2.5 mAh cm–2 and extended cycle life (340 h) at 5 mAh cm–2, providing practical possibilities for Mg metal anodes applications

Bulk spin torque driven perpendicular magnetization switching in L1 0 FePt

International audienceModern information technology demands advanced storage material and efficient data writing scheme. Inherent with a superior perpendicular magnetocrystalline anisotropy, the FePt in L1 0 phase envisions magnetic storage with ultrahigh capacity. However, reversing FePt magnetic state and therefore the encoded information has been proven to be extremely difficult. Here, we demonstrate that an electric current is capable to exert a large spin torque on a L1 0 FePt magnet, which ultimately leads to reversible magnetization switching through domain nucleation and expansion in an efficient and simple manner

Bulk Spin Torque‐Driven Perpendicular Magnetization Switching in L

International audienceModern information technology demands advanced storage material and efficient data writing scheme. Inherent with a superior perpendicular magnetocrystalline anisotropy, the FePt in L1 0 phase envisions magnetic storage with ultrahigh capacity. However, reversing FePt magnetic state and therefore the encoded information has been proven to be extremely difficult. Here, we demonstrate that an electric current is capable to exert a large spin torque on a L1 0 FePt magnet, which ultimately leads to reversible magnetization switching through domain nucleation and expansion in an efficient and simple manner