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I have been reading up on magnetostriction, and noted that some materials expand while other contract in the direction of an applied magnetic field, and that it is attributed to the rotation of the magnetic domains to align with the magnetic field.

So I imagine this has to do with the shape of the domains as they form within the material and their magnetic poling in relation to its structure. Is this a correct understanding of the effect taking place? What other things might be worth considering?

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