  The magnetic anisotropy in MgO-capped MnPt films and its voltage control are
studied using first-principles calculations. Sharp variation of the magnetic
anisotropy with film thickness, especially in the Pt-terminated film, suggests
that it may be widely tuned by adjusting the film thickness. In thick films the
linear voltage control coefficient is as large as 1.5 and $-0.6$ pJ/Vm for
Pt-terminated and Mn-terminated interfaces, respectively. The combination of a
widely tunable magnetic anisotropy energy and a large voltage-control
coefficient suggest that MgO-capped MnPt films can serve as a versatile
platform for magnetic memory and antiferromagnonic applications.
