Magnetic phase diagram mapping in Fe1−xRhx composition-spread thin films

We have fabricated high-quality polycrystalline Fe1− xRh x composition-spread thin films by cosputtering Fe and Rh, and investigated their structural and magnetic transformations as a systematic function of composition. With increasing Rh concentration, Fe1− xRh x thin film undergoes from an α׳ phase to a disordered γ phase and also shows a magnetic transition from a ferromagnetic phase to a paramagnetic phase. Vibrating-sample magnetometry and x-ray magnetic circular dichroism measurements show an antiferromagnetic-ferromagnetic transition in the range of 0.52 <  x < 0.58 in the Fe1− xRh x composition gradient at room temperature. Based on our structural and magnetic property mapping, we construct a thin-film phase diagram of Fe1- xRh x. Compared to reported results in bulk alloys, the antiferromagnetic-ferromagnetic transition in the Fe1− xRh x thin films was found to occur at slightly higher Rh concentrations, while the boundary between the pure γ phase and the α׳/ γ mixed phase region is shifted to the lower concentration Rh.

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