Room‐Temperature Magnetism in 2D MnGa₄‐H Induced by Hydrogen Insertion

Abstract

2D room‐temperature magnetic materials are of great importance in future spintronic devices while only very few are reported. Herein, a plasma‐enhanced chemical vapor deposition approach is exploited to construct the 2D room‐temperature magnetic MnGa4‐H single crystal with a thickness down to 2.2 nm. The employment of H2 plasma makes hydrogen atoms can be easily inserted into the MnGa4 lattice to modulate the atomic distance and charge state, thereby ferrimagnetism can be achieved without destroying the structural configuration. The as‐obtained 2D MnGa4‐H crystal is high‐quality, air‐stable, and thermo‐stable, demonstrating robust and stable room‐temperature magnetism with a high Curie temperature above 620 K. This work enriches the 2D room‐temperature magnetic family and opens up the possibility for the development of spintronic devices based on 2D magnetic alloys.

Gallium‐Based Liquid Metals in Rechargeable Batteries: From Properties to Applications

“…[ 50 ] Simultaneously, the liquid metal can deform into different shapes to release strain so that it can adapt to the change in surface tension during the alloying reaction. Thanks to the good affinity of Ga‐based liquid metals to other metals, multiple alloys have been achieved, such as GaLi, [ 35 ] GaAu, [ 51 ] GaMg , [ 52 ] CuGa 2 , [ 53 ] Ag 2 Ga, [ 54 ] MnGa 4 , [ 55 ] et al. Taking advantage of these spontaneous alloying reactions, the adherence of liquid metal on the substrate can be adjusted, and the ion flux at the interface is expected to be homogenized, thus reducing dendrite growth and increasing the cycling life of the battery.…”

Strong Room-Temperature Ferromagnetism in Ultrathin NiOOH Nanosheets through Surfactant Manipulation

“…Exploring room-temperature 2D FM materials with tunable spin ordering is still essential. In addition to the anisotropic dimensionality effect, strain , and impurities − can also tune the spin ordering, leading to FM. Although this enhancement is generally weak in antiferromagnetic (antiFM) bulk phases, it can become particularly strong in 2D materials due to the significantly enhanced anisotropic electronic and magnetic structures in their ultrathin geometry. , NiOOH, a layered material which can be readily tuned by doping , and strain engineering, , may be able to be fabricated into a tunable FM 2D material.…”