Zero-bias-field spin wave excitations in trapezoidal ferromagnetic strips

Over the past years, much effort has been dedicated to the static and dynamic properties of patterned ferromagnetic films both from fundamental point of view and for numerous potential applications. Particularly, understanding and monitoring high frequency dynamics has become a great challenge for developing microwave devices at GHz frequencies. The main purpose of this paper is to investigate both experimentally and theoretically the zero-field dynamic permeability spectra of soft ferromagnetic strips possessing bevel edges. As a result, microwave permeability spectra exhibiting multiple narrow resonances were observed. The attempts for interpreting such magnetic excitations were performed with the help of micromagnetic models in two-dimensional periodical boundary conditions within the plane.