Ferromagnetic Resonance Response of <i>bcc</i> Fe ₆₀ V ₄₀ Layers Generated from Short‐Range Ordered Precursors

ABSTRACT Layers of body‐centered cubic ( bcc ) Fe 60 V 40 are generated in short‐range ordered (SRO) Fe 60 V 40 precursors through atomic displacements caused by the irradiation of light noble gas ions. The structural change leads to the onset of ferromagnetism confined to the bcc layers. Here, the variation of ferromagnetic resonance response as a function of Ne + ‐ions of energies varying from 5 to 30 keV, while keeping the fluence fixed at 7 × 10 15 ions/cm 2 is investigated. The irradiation was performed on SRO Fe 60 V 40 films grown at 300 K as well as at 573 K. Shifts of the resonance line position as a function of ion energy are observed. As the ion energy is increased, the atomic displacements are distributed deeper within the film, thereby increasing the thickness of the induced bcc layers. The results can be understood in terms of a saturation magnetization ( M s ) that is fixed for a given growth temperature, and an increasing effective magnetic thickness ( t eff ) with increasing ion‐energy. Despite the varying t eff , the Landé g ‐factor and Gilbert damping tend to remain relatively stable, respectively at 2.099 ± 0.006 and 0.003 ± 0.001, thus providing a material system well‐suited for microwave applications, that can be reliably modified using ion‐irradiation.