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Laser-induced switching and manipulation of the spins in magnetic materialsare of great interest to revolutionize future magnetic storage technology andspintronics with fastest speed and least power dissipative. Inspired by therecent discovery of intrinsic two-dimensional (2D) magnets, which provideunique platform to explore the new phenomenon for light-control magnetism inthe 2D limit, we propose to realize light can efficiently tune magneticproperties of 2D ferrimagnets in early time. Here, using the 2D ferrimagneticMXenes as prototype systems, our real-time density functional theory (TDDFT)simulation show that laser pulses can directly induce ultrafast spin-selectivecharge transfer between two magnetic sublattices on a few femtoseconds, andfurther generate dramatic changes in the magnetic structure of these MXenes,including a magnetic order transition from ferrimagnetic (FiM) to transientferromagnetic (FM). The microscopic mechanism underpinning this ultrafastswitching of magnetic order in MXenes is governed by optically inducedinter-site spin transfer (OISTR) effect, which theoretically enables theultrafast direct optical manipulation of the magnetic state in MXenes-basedmaterials. Our results open new opportunities to optically manipulate the spinin 2D magnets.

Optically driven ultrafast magnetic order transitions in two-dimensional ferrimagnets