New phenomena in the study of shape effects in ferromagnetic resonance

Ferromagnetic resonance (FMR) measurements have been performed on various s amples with a rectangular form. The in-plane angular dependence of the ferr omagnetic resonance absorption peak retains the symmetry of the sample shap e. In addition, the appearance of a new high-field resonance feature, which shows a great sensitivity to the sample shape, is reported. These are inte rpreted as arising from spin wave modes localised at the sample edges. This is supported by FMR measurements on circular samples, where the high-field resonance features are absent. A uniaxial dependence of the linewidth is o bserved in samples grown by the melt-spinning technique. (C) 1999 Elsevier Science B.V. All rights reserved.