  Switching the magnetization of a shape-anisotropic 2-phase multiferroic
nanomagnet with voltage-generated stress is known to dissipate very little
energy ($<$ 1 aJ for a switching time of $\sim$0.5 ns) at 0 K temperature.
Here, we show by solving the stochastic Landau-Lifshitz-Gilbert equation that
switching can be carried out with $\sim$100% probability in less than 1 ns
while dissipating less than 2 aJ at {\it room temperature}. This makes
nanomagnetic logic and memory systems, predicated on stress-induced magnetic
reversal, one of the most energy-efficient computing hardware extant. We also
study the dependence of energy dissipation, switching delay, and the critical
stress needed to switch, on the rate at which stress is ramped up or down.
