Abstract
We proposed an explanation of the recent observations by Zaretsky [Appl. Phys. Lett. 92, 011913 (2008)] who discovered sharp increase in nickel plasticity under impact loading near Curie temperature TC. Growth of plasticity is explained by reduction in dynamical deceleration of dislocations controlled by their interaction with paramagnetic obstacles. The decreased contribution of these obstacles is due to spin-dependent transitions in internal magnetic field of ferromagnetic in radical pair dislocation-obstacle from strong to weak bonding states. The main contribution to the effect is from fields of magnetic fluctuations which have a large growth near Curie point.
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