Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.73: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Magneto-resistance measurements in para- and ferromagnetic Fe₆₀Al₄₀ nanowires — Vico Liersch¹, •Alexander Schmeink¹, Benedikt Eggert², Tobias Warnatz¹, Sebastian Wintz^1,3, Jonathan Ehrler¹, Roman Böttger¹, Gregor Hlawacek¹, Kay Potzger¹, Jürgen Lindner¹, Jürgen Faßbender¹, Artur Erbe¹, Heiko Wende², and Rantej Bali¹ — ¹Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — ²CENIDE & Universität Duisburg-Essen, Duisburg, Germany — ³Paul Scherrer Institut, Villigen PSI, Switzerland

Paramagnetic (PM) B2 Fe₆₀Al₄₀ can be disordered into the ferromagnetic (FM) A2 structure using light noble gas ions.[1] The transition can be adjusted using the ion fluence and reversed via annealing thus providing a tunable magnetic material.

Using a focused Ne⁺ ion beam of ∼2 nm spot-size it is possible to locally induce disorder in thin films of such a material, creating FM regions in PM surroundings.[2] This enables patterning of FM|PM|FM structures in the current-perpendicular-to-plane geometry.

FM stripes of ∼100 nm widths with PM spacings down to 50 nm were written onto 40 nm thick B2 Fe₆₀Al₄₀. The reversal fields of the patterned FM stripes are adjustable via the stripe width, enabling multiple magnetic configurations. Magneto-transport properties of the ion-patterned structures as well as the effect of joule heating on the stability of A2 Fe₆₀Al₄₀ are reported.

[1] E. Menéndez et al. New J. Phys. 10 103030 (2008).

[2] F. Röder et al. Sci. Rep. 5 16786 (2015).