Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Poster I

MA 19.35: Poster

Dienstag, 1. April 2014, 13:00–15:30, P1

Building Blocks of an Artificial Square Spin Ice: Stray Field Studies using micro Hall-Magnetometry — •Merlin Pohlit, Evgeniya Begun, Fabrizio Porrati, Michael Huth, and Jens Müller — Physikalisches Institut, Goethe-Universität, Max-von-Laue-Str. 1, D-60438 Frankfurt am Main, Germany

Besides fundamental aspects of frustration, disorder and degeneracy, spin ice systems allow for studying new physical phenomena like the topological Coulomb phase and the occurrence of magnetic monopoles. Due to the ability to tune the geometric shape and the possibility to access spatially resolved magnetic properties, artificial spin ice systems, i.e. nanostructured arrays of macroscopic spins, have come to the fore of recent research interest. Here we present magnetic measurements performed on individual building blocks of artificial square spin ice. For this purpose a cobalt-based spin ice structure was grown by focused electron beam induced deposition (FEBID) onto the surface of a lithographically defined µm-sized Hall-sensor based on a two dimensional electron gas of an AlGaAs/GaAs heterostructure. This setup provides continuous access to the array’s stray field during magnetic reversal. Results from temperature- and magnetic field-dependent stray field measurements, including minor loops, will be shown and compared to micro magnetic simulations.