Irreversible Wall Motion in Inductive Recording Heads

The effect of signal-induced, irreversible domain wall motion on the isolated transition response of recording heads is investigated. An experimental method is presented allowing differentiation between the effects caused by irreversible wall motion and reversible wall motion. The method, utilizing the injection of a small DC current into the head coil can also determine where in a thin-film head the irreversible motion occurs: in PP or in the backgap. A model explaining the observed effects is presented. © 1989 IEEE