Magnetostrictive effect Magnetostrictive effect: The size of a ferromagnetic substance changes under the action of an external magnetic field; after the external magnetic field is removed, it returns to its original length.
Under the action of a magnetic field, the length of the magnetostrictive material changes linearly and shifts; or it changes repeatedly under the action of an alternating magnetic field, resulting in vibration or sound waves; this material can convert electromagnetic energy into mechanical energy or sound energy, and vice versa.
Convert mechanical energy into electromagnetic energy; the former is called magnetostrictive effect, and the latter is called piezomagnetic effect. Under the action of a certain magnetic field strength, the ferrite magnetic metal produces a length change, which can be understood to be a slight change in the distance between atoms due to magnetization.