Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 9: Magnetic domain walls
MA 9.6: Vortrag
Montag, 12. März 2018, 16:30–16:45, EB 202
Properties of ferrotoroidic domains in artificial nanomagnetic crystals — •Jannis Lehmann1, Claire Donnelly1,2, Naëmi Leo2, Peter Derlet2, Laura Heyderman1,2, and Manfred Fiebig1 — 1Department of Materials, ETH Zurich, Switzerland — 2Paul Scherrer Institute, Villigen PSI, Switzerland
Periodic nanomagnetic arrays can be seen as model spin systems which allow a direct study of spontaneous order, magnetic frustration or other phenomena that emerge at the mesoscale. The possibility to design an artificial magnetic crystal and engineer the magnetic-dipole-based lattice potentials on demand opens the door to novel ferroic systems. Here we apply the concept of artificial crystals to examine ferrotoroidicity, an order that is based on magnetic moments forming a vortex at the level of a unit cell. This arrangement yields a toroidal moment as the associated order parameter. We introduce a two-dimensional nanomagnetic array that provides as-grown toroidal domains. By studying different systems with tailored magnetic-dipole strength via magnetic force microscopy we show how the dipole coupling determines the as-grown domain size and gives rise to an anisotropy in our domain walls. The magnetic configurations of a domain wall are of particular interest as they can be tuned to exhibit a ferro- or an antiferromagnetic-like ordering along the propagation direction of the wall. Our results demonstrate the control of domain size and domain-wall geometry in artificial magneto-toroidal crystals. This work provides an experimental approach for modelling and tailoring ferroic systems and for scrutinizing fundamental properties of ferrotoroidicity.