Enhanced Perpendicular Magnetic Anisotropy of Ferromagnetic Co40Fe40B20 through Two-Dimensional Antiferromagnetic MnPS3 and NiPS3.

Antiferromagnetic materials have emerged as promising platforms for magnonic devices with lower power consumption and faster operation speed. The antiferromagnet/ferromagnet with perpendicular magnetic anisotropy is an essential heterostructure for realizing vertically polarized magnon excitation, detection, and modulation. However, it is still a significant challenge to advance this innovation. We have successfully fabricated two-dimensional antiferromagnet TMPS3 (MnPS3 and NiPS3)/Co40Fe40B20 ferromagnet heterostructures with robust perpendicular magnetic anisotropy. We experimentally observed a magnetic anisotropy transition from the in-plane to out-of-plane easy axis by incorporating a two-dimensional MnPS3 or NiPS3 underlayer. This phenomenon is mainly attributed to the Fe-TMPS3 orbital hybridization at the interface, which enhances the perpendicular magnetic anisotropy contribution from dz2 and dyz orbital coupling, while simultaneously reducing the in-plane magnetic anisotropy contribution from dxy and dx2-y2 orbital coupling. Our work provides a feasible pathway for developing novel magnonic devices involving vertically or tilted polarized magnons.