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We report on the epitaxial growth and the characterization of thin FePt filmsand the subsequent patterning of magnetic lattice structures. These structurescan be used to trap ultracold atoms for quantum simulation experiments. We useMolecular Beam Epitaxy (MBE) to deposit monocrystalline FePt films with athickness of 50 nm. The films are characterized with X-ray scattering andMossbauer spectroscopy to determine the long range order parameter and the hardmagnetic axes. A high monocrystalline fraction was measured as well as a strongremanent magnetization of M = 900 kA/m and coercivity of 0.4 T. Using ElectronBeam Lithography (EBL) and argon ion milling we create lattice patterns with aperiod down to 200 nm, and a resolution of 30 nm. The resulting lattices areimaged in a Scanning Electron Microscope in cross-section created by a FocusedIon Beam. A lattice with continuously varying lattice constant ranging from 5micrometer down to 250nm has been created to show the wide range of lengthscales that can now be created with this technique.

Deposition and patterning of magnetic atom trap lattices in FePt films with periods down to 200nm