Magnetostructural phase transition in Fe₆₀V₄₀ alloy thin films

Ferromagnetism can be induced in non-ferromagnetic alloys such as B2 Fe₆₀Al₄₀[1] and B2 Fe₅₀Rh₅₀[2] through lattice disordering. Here we study a magnetostructural transition in Fe₆₀V₄₀ thin films using ion-irradiation. We show that the as-grown films possess an M_S of 17 kA/m and irradiation with 25 keV Ne⁺-ions at a fluence of 5 x 10¹⁵ions/cm² leads to an increase of M_S to ∼ 750 kA/m. A structural short-range order is observed in the as-grown films that transforms to A2 phase via ion-irradiation. Mössbauer spectroscopy and Ferromagnetic Resonance have been applied to track the variation of local magnetic ordering and dynamic behaviour respectively.

Financial support by DFG grants BA 5656/1-2 and WE 2623/14-2 is acknowledged.

[1]Ehrler, J.et al., New J. Phys.,22,073004(2020)

[2]Eggert, B.et al., RSC Adv.,10,14386(2020)