Magnetization Creep in Nickel-Iron Films via the Lever Mechanism

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Abstract
Nickel‐iron films exhibit creep in a combination longitudinal dc and transverse ac field. It has been found experimentally that the creep threshold curve is not fixed in field space like the rotational switching curve, but can be displaced along the transverse field direction by an amount equal to an extra transverse dc bias field. Thus the creep threshold is a function of only the oscillating component of the transverse field. The dc component of the transverse field can be increased with little change in the shape of the creep threshold curve until the creep threshold coincides with the switching threshold curve. This has been found so far to hold for films up to 10 800 A thick. These results can be explained by a simple theory based on the ``lever'' mechanism for creep proposed last year: The additional field which causes creep originates from the induced magnetic charge on the wall due to the applied fields rotating the parallel and antiparallel domains through different angles. This theory predicts creep threshold curves which coincide with the experimental curves. The lever mechanism is unique among proposed creep models in explaining this transverse displacement of the creep threshold.

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