磁致伸缩效应
指材料在施加磁场时发生变形，或材料在变形时产生磁场的效应。这类材料通常含有镍，镍表现出很强的磁致伸缩性。
磁致伸缩材料（通常为叠片形式）用于磁致伸缩换能器。由于涡流的存在，磁致伸缩换能器的损耗通常高于压电换能器，因此对冷却的要求更高。不过，它们更加坚固耐用，并且可以在更高温度下使用。
Magnetostrictive effect
An effect whereby a material deforms if a magnetic field is applied or whereby a magnetic field is generated if the material is deformed. These materials often contain nickel which exhibits strong magnetostriction.
Magnetostrictive materials (generally laminated) are used in magnetostrictive transducers. Because of eddy currents, magnetostrictive transducers generally have higher loss than piezoelectric transducers, and therefore have greater cooling requirements. However, they are more rugged and can be used at higher temperatures.