The magnetostrictive effect is a phenomenon where certain materials change their shape or dimensions when exposed to a magnetic field. This effect occurs in specific materials, known as magnetostrictive materials, which can expand or contract in response to the strength and direction of the magnetic field applied to them. This property is utilized in various applications, such as sensors and actuators. For example, in ultrasonic transducers, the magnetostrictive effect helps convert electrical energy into mechanical vibrations, enabling the generation of sound waves. This technology is valuable in fields like medical imaging and industrial testing.