d⁰ Magnetic Skyrmions in Two‐Dimensional Lattice

Abstract

Magnetic skyrmions are topologically protected chiral spin textures that hold great promise for information storage and processing. The current research efforts on magnetic skyrmions are exclusively based on d-orbital magnetism, which restricts their existence in a narrow window of temperature-external magnetic field (T-B) phase diagram. Herein, employing first-principles and Monte-Carlo simulations, the work reports the identification of d 0 magnetic skyrmions in 2D lattice of Tl 2 NO 2 . Arising from inversion asymmetry and strong spin-orbit coupling compensated by ligand of heavy element, large Dzyaloshinskii-Moriya interaction is obtained in monolayer Tl 2 NO 2 . This, competed with p-orbital exchange interaction, leads to the d 0 skyrmion physics under external magnetic field. Importantly, different from d-orbital topological magnetism, the d 0 magnetic skyrmions can be stabilized in a wide window of T-B phase diagram. The underlying physics is related to the small magnetic moment and delocalization character of d 0 magnetism. Furthermore, the work also demonstrates that the d 0 magnetic skyrmions are strongly coupled with ferroelectricity. These findings open a new direction for magnetic skyrmion research.

Magnetic skyrmions and their manipulations in a 2D multiferroic CuCrP2Te6 monolayer

“…The DMI can be described as D ij = d ·( ẑ × û ij ), 18,49,50 where û ij denotes the unit vector point from the nearest-neighboring spins i to j , while ẑ is pointing along the z direction. Since the out-of-plane component of DMI is negligible, 18,50 we only consider the in-plane component of D ij . The calculated DMI is remarkably large, which is 2.3 (1.2) times larger than that of the J value for the AFE (FE) state.…”