Almost all ferromagnetic materials exhibit the phenomenon of magnetostriction in
which the material spontaneously expands or contracts in response to a magnetic field.
The phenomenon is due to the fact that the material can ordinarily increase its local
magnetization slightly by expanding or contracting to optimize the separation of its ion
cores. The sign and magnitude of the magnetostriction depends on the material.
Magnetostriction is a useful property that permits a time-varying magnetic field to be converted to a mechanical signal, or vice versa. It is used in transducers and in small speakers for consumer electronics, among many other applications. While nickel was the principle material of choice for early magnetostrictive devices, ferrites are often preferred today since their high resistance minimizes losses due to induced electrical currents.
Magnetostriction is a useful property that permits a time-varying magnetic field to be converted to a mechanical signal, or vice versa. It is used in transducers and in small speakers for consumer electronics, among many other applications. While nickel was the principle material of choice for early magnetostrictive devices, ferrites are often preferred today since their high resistance minimizes losses due to induced electrical currents.
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