Near-Room-Temperature Easy-Plane p-Orbital Ferromagnetism in Half-Metallic Monolayer La 2 CO 2 †

Abstract

We propose monolayer La 2 CO 2 as a thermodynamically stable MXene exhibiting p-orbital itinerant ferromagnetism. Driven by the Stoner mechanism, this half-metal achieves 100% spin polarization. Specifically, the band inversion within the carbon sublattice is induced by La d-f orbital hybridization, resulting in a near-room-temperature Curie point (283 K) and robust easy-plane anisotropy. With a negligible in-plane anisotropy barrier (<0.02 meV/atom), the material exhibits ultralow damping and minimal pinning effects. These exceptional physical properties render monolayer La 2 CO 2 a highly suitable candidate for advanced spintronic applications, such as spin superfluid devices.