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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.24: Poster

Tuesday, March 8, 2016, 09:30–12:30, Poster B1

Evolution of magnetic domains in ion-induced single nanostructures — •Anna Semisalova¹, Sebastian Wintz^1,2, Gregor Hlawacek¹, Ciarán Fowley¹, Kay Potzger¹, Jürgen Lindner¹, Jürgen Fassbender^1,3, and Rantej Bali¹ — ¹HZDR, Institute of Ion Beam Physics and Materials Research, Dresden, Germany — ²Paul Scherrer Institute, Villigen-PSI, Switzerland — ³TU Dresden, Germany

Ion-induced chemical disordering of paramagnetic B2-Fe₆₀Al₄₀ causes an increase in the Fe-Fe nearest neighbours, leading to the formation of ferromagnetic (FM) A2-Fe₆₀Al₄₀ [1]. Here we present FM stripes and dots in B2-Fe₆₀Al₄₀ directly written with a highly-focused (2 nm) Ne⁺ beam [2], and study the evolution of their magnetic domains with structure size. Domain imaging (using Scanning Transmission X-ray Microscopy and Magnetic Force Microscopy) shows the transition from irregular domains for the broadest stripes to well defined alternating domain structure for 500 nm wide stripes, and to a single domain state for widths below 100 nm. Similarly, dot structures exhibit a transition from a vortex to a single domain state. Our results show that thin-film Fe₆₀Al₄₀ is a model system for one-step patterning of well-defined FM nanostructures of desired geometries [2]. [1] Bali et al., Nano Lett. 14, 435 (2014) [2] Röder et al., Sci. Rep. 5, 16786 (2015)