This work is devoted to the theoretical study of the magnetoplastic effect that manifests itself in motion of dislocations in solids in magnetic fields in the absence of mechanical loading. An expression is obtained for the effective magnetic charge per length unit of dislocation which emerges due to the action of the magnetic field on the dislocation. The effects associated with the emergence of the induced magnetic charges at dislocations are studied. It is shown that the effective magnetic charge appears due to the interaction of the magnetic field only with the edge components of dislocations. The expression is obtained for the force that acts on a dislocation in the magnetic field and it is shown that in the experiments on studying the motion of dislocations in magnetic fields, the determining role must be played by the projection of this force on the glide plane of dislocation.
61.72.Lk Linear defects: dislocations, disclinations
41.20.-q Applied classical electromagnetism
14.80.Hv Magnetic monopoles
$^1$Department of Theoretical Physics, Faculty of Physics, M.V.Lomonosov Moscow State University,