1842 Magnetostriction

The book of science

Tom Sharp

James Prescott Joule electromagnetism


Magnetomechanical effects


Different magnetostrictive materials shrink by different amounts in a magnetic field, depending on the temperature and strength of the field. At room temperature, colbalt can shrink six thousands of a percent. Terfenol-D, a terbium-iron-dysprosium alloy, can shrink two tenths of a percent. Magnetostriction is measured in microstrains, which are parts per million.

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