Print Email Facebook Twitter Deposition and patterning of magnetic atom trap lattices in FePt films with periods down to 200 nm Title Deposition and patterning of magnetic atom trap lattices in FePt films with periods down to 200 nm Author la Rooij, A. (Universiteit van Amsterdam) Couet, S. (IMEC-Solliance) van der Krogt, M.C. (TU Delft QN/Kavli Nanolab Delft; Kavli institute of nanoscience Delft) Vantomme, A. (Katholieke Universiteit Leuven) Temst, K. (Katholieke Universiteit Leuven) Spreeuw, R. J.C. (Universiteit van Amsterdam) Date 2018-07-28 Abstract We report on the epitaxial growth and the characterization of thin FePt films and the subsequent patterning of magnetic lattice structures. These structures can be used to trap ultracold atoms for quantum simulation experiments. We use molecular beam epitaxy to deposit monocrystalline FePt films with a thickness of 50 nm. The films are characterized with X-ray scattering and Mössbauer spectroscopy to determine the long range order parameter and the hard magnetic axes. A high monocrystalline fraction was measured as well as a strong remanent magnetization of M = 900 kA/m and coercivity of 0.4 T. Using electron beam lithography and argon ion milling, we create lattice patterns with a period down to 200 nm, and a resolution of 30 nm. The resulting lattices are imaged in a scanning electron microscope in the cross-section created by a focused ion beam. A lattice with continuously varying lattice constant ranging from 5 μm down to 250 nm has been created to show the wide range of length scales that can now be created with this technique. To reference this document use: http://resolver.tudelft.nl/uuid:c175692e-b470-44b1-8cb1-95ab5935b615 DOI https://doi.org/10.1063/1.5038165 Embargo date 2019-07-28 ISSN 0021-8979 Source Journal of Applied Physics, 124 (4) Part of collection Institutional Repository Document type journal article Rights © 2018 A. la Rooij, S. Couet, M.C. van der Krogt, A. Vantomme, K. Temst, R. J.C. Spreeuw Files PDF 1.5038165_1.pdf 2.04 MB Close viewer /islandora/object/uuid:c175692e-b470-44b1-8cb1-95ab5935b615/datastream/OBJ/view