title: Direct Depth- and Lateral- Imaging of Nanoscale Magnets Generated by Ion Impact.
abstract: Nanomagnets form the building blocks for a variety of spin-transport, spin-wave and data storage devices. In this work we generated nanoscale magnets by exploiting the phenomenon of disorder-induced ferromagnetism; disorder was induced locally on a chemically ordered, initially non-ferromagnetic, Fe60Al40 precursor film using  nm diameter beam of Ne(+) ions at 25 keV energy. The beam of energetic ions randomized the atomic arrangement locally, leading to the formation of ferromagnetism in the ion-affected regime. The interaction of a penetrating ion with host atoms is known to be spatially inhomogeneous, raising questions on the magnetic homogeneity of nanostructures caused by ion-induced collision cascades. Direct holographic observations of the flux-lines emergent from the disorder-induced magnetic nanostructures were made in order to measure the depth- and lateral- magnetization variation at ferromagnetic/non-ferromagnetic interfaces. Our results suggest that high-resolution nanomagnets of practically any desired 2-dimensional geometry can be directly written onto selected alloy thin films using a nano-focussed ion-beam stylus, thus enabling the rapid prototyping and testing of novel magnetization configurations for their magneto-coupling and spin-wave properties.
authors.affiliation: Triebenberg Labor, Institut für Strukturphysik, Technische Universität Dresden, D-01062 Dresden, Germany.
authors.forename: Falk
authors.initials: F
authors.lastname: Röder
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstraße 400, D-01328 Dresden, Germany.
authors.forename: Gregor
authors.initials: G
authors.lastname: Hlawacek
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstraße 400, D-01328 Dresden, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Wintz
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstraße 400, D-01328 Dresden, Germany.
authors.forename: René
authors.initials: R
authors.lastname: Hübner
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstraße 400, D-01328 Dresden, Germany.
authors.forename: Lothar
authors.initials: L
authors.lastname: Bischoff
authors.affiliation: Triebenberg Labor, Institut für Strukturphysik, Technische Universität Dresden, D-01062 Dresden, Germany.
authors.forename: Hannes
authors.initials: H
authors.lastname: Lichte
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstraße 400, D-01328 Dresden, Germany.
authors.forename: Kay
authors.initials: K
authors.lastname: Potzger
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstraße 400, D-01328 Dresden, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Lindner
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstraße 400, D-01328 Dresden, Germany.|Institut für Festkörperphysik, Technische Universität Dresden, Helmholtzstr. 10, D-01069 Dresden, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Fassbender
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstraße 400, D-01328 Dresden, Germany.
authors.forename: Rantej
authors.initials: R
authors.lastname: Bali