Similar effects are also found in the dielectrics under high electric field which is known as electrostriction.

Electro-Mechanical Phenomenon

Electro-mechanical phenomenon is quite different from the piezoelectricity as it is essentially non-linear in nature and the response is always unidirectional under unbiased field i.e. the material can only expand irrespective of the direction of voltage or magnetic field applied to it.

The phenomenon of magnetostriction was discovered in nickel by James Joule in 1840. Later, it has also been observed in other ferromagnets and their alloys. The growth of magnetostriction is presented in Figure 12.2

Figure 12.2: Growth in magnetostriction