Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 57: Posters Magnetism II
MA 57.24: Poster
Thursday, March 19, 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 Hellwig1,2, 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 (Ms) 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 Ms<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 Ms 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 Ms, 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).