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Skyrmions are localized solitonic spin textures with protected topology,which are promising as information carriers in ultra-dense and energy-efficientlogic and memory devices. Recently, magnetic skyrmions have been observed inmagnetic thin films, and are stabilized by the extrinsic interfacialDzyaloshinskii-Moriya interaction (DMI) and/or external magnetic fields. Thespecific effects in magnetic monolayer materials have not been thoroughlystudied. Here, we investigate the intrinsic magnetic skyrmions in a family ofmonolayer Janus van der Waals magnets, MnSTe, MnSeTe, VSeTe, and MnSSe, by thefirst-principles calculations combined with the micromagnetic simulations. Themonolayer Janus MnSTe, MnSeTe, and VSeTe with out-of-plane geometric asymmetryand strong spin-orbit coupling (SOC) have a large intrinsic DMI, which couldstabilize a sub-50 nm intrinsic skyrmions in monolayer MnSTe and MnSeTe at zeromagnetic field. While monolayer VSeTe with in-plane easy axis forms magneticdomain rather than skyrmions. Moreover, the size and shape of skyrmions can betuned by an external magnetic field. Therefore, our work motivates a new vistafor seeking intrinsic skyrmions in atomic-scale magnets.

Intrinsic skyrmions in monolayer Janus magnets