Consequences of Demagnetizing Field Inhomogeneity on the Shape of Ferromagnetic Resonance Lines

Abstract

The asymmetry of the magnetic resonance line in bulk ferromagnetic metals is of one sign when the magnetic field is parallel to the sample surface and is of opposite sign when the field is perpendicular. All known relaxation theories lead to the type of asymmetry which is observed in the parallel case. It is demonstrated here that for both parallel and perpendicular resonance a contribution to asymmetry as well as to linewidth comes from the inhomogeneity of the internal field and this contribution to asymmetry is of reversed sign in the perpendicular case. Elimination of edge effects reduces it to zero.