Magnetostrictive materials are substances that change their shape or dimensions when exposed to a magnetic field. This property is due to the alignment of magnetic domains within the material, which can expand or contract in response to magnetic forces. Common examples of magnetostrictive materials include iron, nickel, and certain alloys. These materials are widely used in various applications, such as sensors, actuators, and transducers. In these devices, the ability to convert magnetic energy into mechanical movement allows for precise control and measurement in technologies like ultrasonic cleaning and sonar systems.