Magnetostriction has following applications: this effect is used in high frequency oscillators and generators of super sound. For under water projectors and sound detectors Reference:
Magnetostriction is a reversible effect because change in magnetsation can be produced by applying stress on the material. This effect is called Villari effect. Reference:
When a ferromagnetic material is magnetised, its length either expands or contracts in the direction of the magnetisation. This effect is called magnetostriction or Joule