Two-dimensional magnetic Janus monolayers and their van der Waals heterostructures: a review on recent progress

Abstract

Magnetic Janus monolayer, a special type of materials which has asymmetric arrangements of surface at the nanoscale, has been shown to present rather exotic properties for applications in spintronics and...

Janus Single‐Layer CoClBr: A Direct Ferromagnetic Semiconductor with Controllable BandGap and Enhanced Magnetic Anisotropy Under Strain

“…[39] Other similar systems, for example, monolayer CoBrI 2 , CoI 2 , and CrSe 2 have the MAE of 0.76, 0.17, and 0.07 meV, respectively. [32] The MAE of CoClBr is 0.542 meV, which is bigger than that of CoI 2 and CrSe 2 and is comparable to that of CoBr 2 .…”

“…[26][27][28] Moreover, the out-of-plane symmetry breaking in Janus structures offers the possibility to introduce new physical phenomena, thereby motivating intense research. [29][30][31][32] For example, in 2022, Di Lu et al predicted that compressive strain can boost the T c from 25 K for the single-layer FeCl 2 to 69-102 K under 3-5% compressive strain. [33] In 2023, L. Zhang predicted that the collective effect of compressive strain and electron doping can make the T c of FeClF approaches the RT (286 K).…”

MXene Fe2C as a promising candidate for the 2D XY ferromagnet

“…Apart from that, Janus materials are being studied [14][15][16]. The realization of MAX phases [17] and then MXenes [18] opened up new perspectives.…”

Bloch-type magnetic skyrmions in two-dimensional lattices

“…9–11 In recent years, with the rise of two-dimensional (2D) materials 12–16 and the discovery of magnetism in monolayers CrI 3 , 17 VSe 2 18–20 and Fe 3 GeTe 2 , 21 many efforts are devoted to investigating skyrmion physics in 2D lattices, and magnetic skyrmions in 2D lattices have been the topic of intense research in condensed matter physics and materials science. 22–39…”

“…[9][10][11] In recent years, with the rise of two-dimensional (2D) materials [12][13][14][15][16] and the discovery of magnetism in monolayers CrI 3 , 17 VSe 2 [18][19][20] and Fe 3 GeTe 2 , 21 many efforts are devoted to investigating skyrmion physics in 2D lattices, and magnetic skyrmions in 2D lattices have been the topic of intense research in condensed matter physics and materials science. [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] According to the inner spin arrangements of vorticity o and helicity g, magnetic skyrmions can debut in three typical cases of (o, g) = (1, 0 or p), (1, AEp/2) and (À1, 0 or AEp/2 or p), corresponding to Ne ´el-type, Bloch-type and antiskyrmions, respectively. 40 These distinct magnetic skyrmions are equivalently attractive and exhibit fertile physics, such as the skyrmion Hall effect.…”