Structure Engineering of 2D Materials toward Magnetism Modulation

Abstract

2D magnetic materials have shown great potentials in fundamental research and spintronic devices. However, the discovered 2D magnetic materials are still limited and their monotonous magnetic properties cannot meet the needs of practical applications. Recently, the modulation of magnetism in 2D materials attracted tremendous attention, which can enrich the 2D magnetic material family and extend their application prospects. Structure engineering is one of the most effective ways to realize tunable 2D magnetic properties. Herein, the recent progress on 2D magnetism modulation via structure engineering is summarized. The basic theory of 2D magnetism is introduced at first. Then, the magnetism modulation by structure engineering is classified into two ways: inducing longrange magnetic ordering into nonmagnetic materials and regulating the native magnetism of intrinsic magnetic materials. Moreover, recent progress on magnetism modulation by intercalation, chemical doping, defect engineering, and heterostructure construction is discussed in detail. Finally, the challenges and prospects in the future of 2D magnetism are also provided.

Synthesis of Group VIII Magnetic Transition-Metal-Doped Monolayer MoSe2

“…Actually, the magnetic moments in induced magnetic materials are not isolated from each other to form a long-range coupling effect. Especially, there are changes in charge, defects, and spin states with dopants in the host material. − The bound magnetic polaron (BMP) mechanism may be expected to explain the observed ferromagnetism after transition-metal doping in MoSe 2 considering the low dopant content and low carrier concentration in our samples. We infer some more distant Fe dopants are located within the polaron radius to interact with defects besides the Fe spin polarization. − It is worth noting that the origin of the observed ferromagnetism in the doped TMD systems has been controversial to date.…”

Intrinsically High Magnetic Performance in Core–Shell Structural (Sm,Y)Fe12‐Based Permanent Magnets

“…Herein, magnetic anisotropic energy K u was determined as K u = E a − E c , where E a and E c are the total energies with magnetization along with the a and c axes, respectively. [ 42 ] The initial spin configuration had the antiparallel structure between a rare‐earth atom and Fe. To reveal the driving force for phase decomposition, the total system energy of Sm 1− n Y n (Fe 0.8 Co 0.2 ) 11 Ti( n = 0.0, 0.125, 0.25, 0.375, 0.5, 0.625, 0.75, 0.875, 1.0) compounds was calculated by DFT.…”

Epitaxial Monolayers of the Magnetic 2D Semiconductor FeBr2 Grown on Au(111)

“…Integration of two-dimensional (2D) materials in technologically relevant applications requires atomic-scale control of the growth of single-crystalline, monolayer-thick films. Meanwhile, many semiconducting 2D materials like graphene, h-BN, or MoS 2 are routinely grown on the wafer scale, but the preparation of magnetic 2D materials is still limited in most cases to micromechanical exfoliation. − Prominent exceptions of this trend are magnetic transition-metal tri- and dihalides, for which single-layer growth was demonstrated recently via molecular beam epitaxy. , In contrast to well-studied trihalides, particularly CrI 3 and CrBr 3 , ,− experimental investigation of the 2D dihalides is less advanced, although their bulk magnetic properties were thoroughly studied …”