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MA: Fachverband Magnetismus

MA 57: Posters Magnetism II

MA 57.24: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P3

Irradiation-induced magneto-structural phase transition in Fe₆₀V₄₀ alloy thin films — •Md. Shadab Anwar¹, Vico Liersch¹, Benedikt Eggert³, Alexander Schmeink¹, Kay Potzger¹, Jürgen Lindner¹, Jürgen Fassbender¹, Heiko Wende³, Olav Hellwig^1,2, and Rantej Bali¹ — ¹Helmholtz-Zentrum Dresden-Rossendorf, Germany — ²Technical University of Chemnitz, Germany — ³University of Duisburg-Essen, Germany

Ion beam irradiation leads to an increased saturation magnetization (M_s) in non-ferromagnetic precursors of Fe₆₀Al₄₀[1], Fe₅₀Rh₅₀[2] and Fe₆₀V₄₀ alloy thin films. Fe₆₀V₄₀ films of 40 nm thickness were prepared using magnetron sputtering onto heated SiO₂/Si substrates. The as-grown films are weakly ferromagnetic with M_s<15 kA/m for growth temperatures between 300 and 673 K. Irradiation with Ne⁺ ions at 25 keV and a fluence of 1 x 10¹⁵ ions/cm² leads to an increase of M_s to 54, 549 and 246 kA/m for films grown at 300, 573 and 673 K respectively. X-ray diffraction of the as-grown films shows a broad peak at 2θ ≈ 44^∘, which suggests short range ordering. Ne⁺-irradiation causes the formation of the A2 structure, which is ferromagnetic. This amorphous to crystalline structural phase transition can be controlled using ion-irradiation, thus leading to a drastic increase in M_s, which can be useful in magnetic pattering applications.

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

[1] Bali, R. et al., Nano Lett.14, 435 (2014).

[2] Kosugi, S. et al., Phys. Res. B 267, 1612 (2009).