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Magnetism of FeRh (001) films strongly depends on film thickness and surfaceterminations. While magnetic ground state of bulk FeRh is G-typeantiferromagnetism, the Rh-terminated films exhibit ferromagnetism with strongperpendicular MCA whose energy +2.1 meV/$\Box$ is two orders of magnitudegreater than 3$d$ magnetic metals, where $\Box$ is area of two-dimensional unitcell. While Goodenough-Kanamori-Anderson rule on the superexchange interactionis crucial in determining the magnetic ground phases of FeRh bulk and thinfilms, the magnetic phases are results of interplay and competition betweenthree mechanisms - the superexchange interaction, the Zener direct-interaction,and magnetic energy gain.

Surface-termination dependent magnetism and strong perpendicular magnetocrystalline anisotropy of a FeRh (001) thin film: A density-functional study