The plastic response of magnetoelastic amorphous solids
1 Department of Chemical Physics, The Weizmann Institute of Science - Rehovot 76100, Israel
2 Department of Physics, Emory University - Atlanta, GA, USA
Received: 2 May 2012
Accepted: 21 June 2012
We address the cross-effects between mechanical strains and magnetic fields on the plastic response of magnetoelastic amorphous solids. It is well known that plasticity in non-magnetic amorphous solids under external strain γ is dominated by the codimension-1 saddle-node bifurcation in which an eigenvalue of the Hessian matrix vanishes at γP like . This square-root singularity determines much of the statistical physics of elasto-plasticity, and in particular that of the stress-strain curves under athermal-quasistatic conditions. In this letter we discuss the much richer physics that can be expected in magnetic amorphous solids. Firstly, magnetic amorphous solids exhibit codimension-2 plastic instabilities, when an external strain and an external magnetic field are applied simultaneously. Secondly, the phase diagrams promise a rich array of new effects that have been barely studied; this opens up a novel and extremely rich research program for magnetoplastic materials.
PACS: 62.20.F- – Deformation and plasticity / 75.50.Kj – Amorphous and quasicrystalline magnetic materials / 62.20.fq – Plasticity and superplasticity
© EPLA, 2012