  We report nanomagnetic switching with Acoustic Waves (AW) launched from
interdigitated electrodes that modulate the stress anisotropy of elliptical
cobalt nanoscale magnetostrictive magnets (340 nm x 270 nm x 12 nm) delineated
on 128 degree Y-cut lithium niobate. The dipole-coupled nanomagnet pairs are in
a single-domain state and are initially magnetized along the major axis of the
ellipse, with their magnetizations parallel to each other. The magnetizations
of nanomagnets having lower shape anisotropy are reversed upon acoustic wave
propagation. Thereafter, the magnetization of these nanomagnets remains in the
reversed state and demonstrate non-volatility. This executes a 'NOT' operation.
This proof of acoustic wave induced magnetic state reversal in dipole-coupled
nanomagnets implementing a 'NOT' gate operation could potentially lead to the
development of extremely energy-efficient nanomagnetic logic. Furthermore,
fabrication complexity is reduced immensely due to the absence of individual
contacts to the nanomagnets, leading to lower energy dissipation
