  We study the physical properties of MnAs under strain by using accurate
first-principles pseudopotential calculations. Our results provide new insight
on the physics of strained multilayer that are grown epitaxially on different
lattice mismatched substrates and which are presently of interest for
spintronic applications. We compute the strain dependence of the structural
parameters, electronic bands, density of states and magnetization. In the
region of strain/stress that is easily directly accessible to measurements, the
effects on these physical quantities are linear. We also address the case of
uniaxial stress inducing sizeable and strongly non linear effects on electronic
and magnetic properties.
