title: Free-standing magnetic nanopillars for 3D nanomagnet logic.
abstract: Nanomagnet logic (NML) is a relatively new computation technology that uses arrays of shape-controlled nanomagnets to enable digital processing. Currently, conventional resist-based lithographic processes limit the design of NML circuitry to planar nanostructures with homogeneous thicknesses. Here, we demonstrate the focused electron beam induced deposition of Fe-based nanomaterial for magnetic in-plane nanowires and out-of-plane nanopillars. Three-dimensional (3D) NML was achieved based on the magnetic coupling between nanowires and nanopillars in a 3D array. Additionally, the same Fe-based nanomaterial was used to produce tilt-corrected high-aspect-ratio probes for the accurate magnetic force microscopy (MFM) analysis of the fabricated 3D NML gate arrays. The interpretation of the MFM measurements was supported by magnetic simulations using the Object Oriented MicroMagnetic Framework. Introducing vertical out-of-plane nanopillars not only increases the packing density of 3D NML but also introduces an extra magnetic degree of freedom, offering a new approach to input/output and processing functionalities in nanomagnetic computing.
authors.affiliation: Institute of Solid State Electronics, Vienna University of Technology , Floragasse 7/1, A-1040 Vienna, Austria.
authors.forename: Marco
authors.initials: M
authors.lastname: Gavagnin
authors.forename: Heinz D
authors.initials: HD
authors.lastname: Wanzenboeck
authors.forename: Stefan
authors.initials: S
authors.lastname: Wachter
authors.forename: Mostafa M
authors.initials: MM
authors.lastname: Shawrav
authors.forename: Anders
authors.initials: A
authors.lastname: Persson
authors.forename: Klas
authors.initials: K
authors.lastname: Gunnarsson
authors.forename: Peter
authors.initials: P
authors.lastname: Svedlindh
authors.forename: Michael
authors.initials: M
authors.lastname: Stöger-Pollach
authors.forename: Emmerich
authors.initials: E
authors.lastname: Bertagnolli
keywords: MFM; computational nanotechnology; electron beam induced deposition; iron; magnetic nanowires; nanomagnet logic; nanomagnetism