Magnetostriction and stress-induced playback loss in magnetic tapes

A direct correspondence between magnetic tape playback level, stress-induced remanence loss, and magnetostrictive properties of corresponding magnetic oxides has been observed. From these results the amount of playback loss was estimated by stressing a short segment of tape, by measuring magnetostriction in compacts of magnetic pigments or by an analysis of the Fe
²⁺
and Co
²⁺
content if the state of the cobalt within each particle is known.