Ultrahigh Neel Temperature Antiferromagnetism and Ultrafast Laser-Controlled Demagnetization in a Dirac Nodal Line MoB₃ Monolayer.

ABSTRACT: Two-dimensional (2D) antiferromagnetic (AFM) materials boasting a high Néel temperature (T_N), high carrier mobility, and fast spin response under an external field are in great demand for efficient spintronics. Herein, we theoretically present the MoB₃ monolayer as an ideal 2D platform for AFM spintronics. The AFM MoB₃ monolayer features a symmetry-protected, 4-fold degenerate Dirac nodal line (DNL) at the Fermi level. It demonstrates a high magnetic anisotropy energy of 865 μeV/Mo and an ultrahigh T_N of 1050 K, one of the highest recorded for 2D AFMs. Importantly, we reveal the ultrafast demagnetization of AFM MoB₃ under laser irradiation, which induces a rapid transition from a DNL semimetallic state to a metallic state

SUBMITTER: Gao Z 

PROVIDER: S-EPMC11378283 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature