Transducers were built by applying the magnetostrictive effect; small pieces of a magnetostrictive material, typically nickel, were attached to either side of the end of the wire, inside an electromagnet.
2.
The magnetostriction \ lambda characterizes the shape change of a ferromagnetic material during magnetization, whereas the inverse magnetostrictive effect characterizes the change of sample magnetization M ( for given magnetizing field strength H ) when mechanical stresses \ sigma are applied to the sample.
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