Piezomagnetism is a phenomenon where certain materials develop a magnetization when they are subjected to mechanical stress. A synonym for piezomagnetism would be "magnetostriction." This term refers to the ability of some materials to change shape when subjected to a magnetic field. Another synonym for piezomagnetism would be "stress-induced magnetism." This describes the same phenomenon where magnetism arises as a result of mechanical stress. Other related terms include "ferroelasticity" and "ferromagnetism." Ferroelasticity refers to the ability of some materials to undergo reversible deformation under a varying mechanical stress. Ferromagnetism is the phenomenon where certain materials become magnetic when exposed to an external magnetic field.