Regensburg 2019 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 62: Direct-Write Nanofabrication and Applications III
(Electron Beam Induced Processing) (joint session DS/TT)
TT 62.4: Talk
Thursday, April 4, 2019, 16:00–16:15, H32
Micro-Hall Magnetometry of FEBID-fabricated 3D magnetic nano-architectures — •Jens Müller1, Mohanad Al Mamoori1, Lukas Keller1, Michael Huth1, and Christian Schröder2 — 1Institute of Physics, Goethe University Frankfurt — 2Institute for Applied Materials Research, Bielefeld University of Applied Sciences
Whereas most of the previous studies of nanoscale magnetic structures – owing to the fabrication by means of lithographic processes – have focused on one- or two-dimensional (1D/2D) nanomagnets, thanks to advances in fabrication and sensing techniques it is now possible to investigate free-standing magnetic 3D structures individually, in small arrays, or in complex connected lattice architectures. Here we report on the combination of focused electron beam induced deposition (FEBID) and micro-Hall magnetometry, as fabrication and high-resolution sensing tools, respectively. Free-form structures with minimal feature size of a few tens of nm of the metallic ferromagnets Fe, Co and Fe-Co are deposited directly on a semiconductor Hall sensor which serves as the substrate and allows to detect the magnetic stray field as a function of the external magnetic field and temperature. In the talk, we will discuss the measured and simulated magnetization reversal of small arrays of Fe-Co nanotrees and -cubes [1,2]. Furthermore, we will give an outlook on future possibilities of fabricating magnetic structures with geometrical frustration (towards 3D artificial spin ice) and studying dynamical processes by means of magnetic flux noise spectroscopy.
L. Keller et al., Sci. Rep. 8, 6160 (2018).
M. Al Mamoori et al., Materials 11, 289 (2018).