Wall motion threshold fields in permalloy films for off-axis applied fields

The results of a study of the threshold fields necessary to initiate Néel wall motion when the magnetic field is applied at an angle to the easy axis of the thin film are presented in this paper. A model similar to those previously postulated is developed to carry out the usual minimization of energies. In carrying out the analysis, field dependent terms are separated from those that are not and the particular field dependencies are studied in detail. The formulation of the model and the results obtained are discussed in detail without including derivations which are available elsewhere. Experimental results are presented to support the model developed here.