Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 48: Focus Session: Exploiting Spintronics for Unconventional Computing (joint session MA/TT)

TT 48.1: Invited Talk

Wednesday, March 14, 2018, 09:30–10:00, H 1012

Control of Mesoscopic Magnetism for Computation — •Laura Heyderman — Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland — Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland

To exploit mesoscopic magnetism in computation, it is necessary to control the magnetic states with an external stimulus. In hybrid mesoscopic structures with two different ferromagnetic layers, the static and dynamic behaviour results from the mutual imprint of the magnetic domain configurations, which can be exploited to create a nanoscale switch for the magnetisation [1]. With multiferroic composites, an electric field can be used to induce uniform magnetization rotation in single domain submicron ferromagnetic islands grown on ferroelectric single crystal [2]. In artificial spin ice [3], which are arrays of coupled nanomagnets, emergent magnetic monopoles can be manipulated in a magnetic field [4]. For device applications, the additional control can be gained by modifying the anisotropy of the individual magnets. Such anisotropy engineering can also be used to control the chirality of vortex states in hexagonal rings of nanomagnets [5]. Finally, one can modify the geometry of an artificial spin ice to display dynamic chirality where the average magnetization rotates in unique sense during thermal relaxation [6]. [1] M. Buzzi et al. PRL (2013) [2] P. Wohlhüter et al. Nat. Commun. (2015) [3] L.J. Heyderman and R.L. Stamps, JPCM (2013) [4] E. Mengotti et al. Nature Phys. (2011) [5] R. Chopdekar et al. New J. Phys (2013) [6] S. Gliga et al. Nat. Mater. (2017)