Longitudinal and transverse incremental permeability in Mu-metal thin films

The transverse permeability ratio (TPR) and longitudinal permeability ratio (LPR) as a function of an external field of mumetal films have been invest igated in conjunction with the magnetic properties. The mumetal films were prepared by the R.F.magnetron sputtering method in Ar atmosphere. The LPR c urve shows the single peak pattern, and the TPR curve shows the double peak pattern indicating the existence of the magnetic anisotropy effect. The ma gnitude of the incremental permeability are strongly depended on the magnet ic softness. The large changes of LPR and TPR in low external fields can be useful for the evaluation of the magnetic softness.