Arbitrary dynamic magnetostriction under alternating and rotating fleld is measured by using two-dimensional magnetk measurement technique with three-axial strain gage, whkh provides its output in direction inclined 45', 90', and 135" to the rolling direction of a sampk sheet. By this technique the arbitrary dynamic magnetostriction is expressed with a strain tensor. That is, the elements of the tensor can be computed with the measured magnetostrktion in each direction. Therefore, the magnetostriction in an arbitrary direction under alternating and rotating fleld excitation can be gotten from this tensor expression.
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