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SYCL: Symposium Curvilinear condensed matter

SYCL 1: Curvilinear Condensed Matter

SYCL 1.3: Hauptvortrag

Freitag, 20. März 2020, 10:30–11:00, HSZ 02

3D Mesoscopic Magnetic Architectures: Fabrication, Actuation & Imaging — •Laura Heyderman — Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, Switzerland — Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, Switzerland

Advances in the manufacture of magnetic micro- and nanoscale systems in 3D are of great interest because of both the additional degrees of freedom [1] and the possibility to produce devices exploiting new topologies. We have manufactured 3D magnetic structures using two-photon laser lithography in combination with thin film deposition. One example is an artificial buckeyball consisting of a polymer scaffold coated with a cobalt layer that we have characterised with resonant ptychographic tomography to obtain a 3D map of the elemental composition with 25 nm spatial resolution [2]. Furthermore, we have established a method for tomographic imaging of the magnetization vector field, revealing the structure surrounding a Bloch point singularity [3]. We are also developing magneto-mechanical systems, for example a magneto-rheological fluid/polymer composite that displays shape memory [4], and have characterised the microstructure with hard x-ray tomography. In addition, we have created programmable origami micromachines incorporating arrays of nanomagnets such as a microscale bird that can flap, hover, turn and slide [5]. 1. S. Skjaervø et al. Nat Rev Phys 2019; 2. C. Donnelly et al. PRL 2015; 3. C. Donnelly et al. Nature 2017; 4. P. Testa et al. Adv. Mater. 2019; 5. J. Cui et al. Nature 2019.