Spin-wave modes in amorphous CoFeNiZr thin films grown with a composition gradient structure: zirconium concentration nanoengineering and magnetic properties

We present a detailed analysis of magnetic characterizations of amorphous ( CoFeNi ) ( 1 − x ) Zr x thin films. Metal concentration gradients were created using serial dilution of CoFeNi by zirconium ( Zr ) concentrations. A continuous range of compositions from ∼ 69.46 atomic percent (at. % ) CoFeNi to 86.92 at. %

CoFeNi were synthesized. In this work, we reported the experimental observation of spin-waves (SW) modes in ( CoFeNi ) ( 1 − x ) Zr x alloys excited under different orientations of the external magnetic field to be parallel and perpendicular to the studied thin-films surface layer. Comparisons of calculated SW mode frequencies and their corresponding profiles with an out-of-plane angle dependence FMR-results revealed on the compositionally graded ( CoFeNi ) ( 1 − x ) Zr x films are presented as well. Our results may provide valuable implications for designing new spintronic and magnetic devices using amorphous CoFeNiZr thin films in the context of the manipulation of localized SW modes inside the magnetic thin films studied at room temperature.