Abstract
We have performed the linear analysis for the incompressible magneto-Rayleigh-Taylor instability of an elastic-medium slab. Whilst for the thickest slabs, the stabilization provided by the magnetic field adds up to the stabilizing effects of the elasticity, a competition phenomenon is found for the thinnest ones which makes them less stable as larger is the magnetic field. In such cases, the magnetic field reduces the slab relative deformation in detriment of the elasticity stabilizing efficiency and the slab becomes more unstable than when a single stabilizing mechanism is present. Implications for the trigger of crust quakes in magnetars are discussed.
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