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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.73: Poster
Tuesday, March 13, 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 Wintz1,3, 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).