Dresden 2014 – scientific programme
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MA: Fachverband Magnetismus
MA 19: Poster I
MA 19.39: Poster
Tuesday, April 1, 2014, 13:00–15:30, P1
Thermal ordering in a 2D artificial Ising system — •Henry Stopfel1, Unnar Arnalds1, Vassilios Kapaklis1, Oliver Bärenbold1, Marc Verschuuren2, Ulrike Wolff3, Volker Neu3, and Björgvin Hjörvarsson1 — 1Department of Physics and Astronomy, Uppsala University, Sweden — 2Philips Research Laboratories, Eindhoven, Netherlands — 3Institute of Metallic Materials, IFW Dresden, Germany
Thermally active nano-patterned arrays composed of dipole coupled macrospins provide a means for investigating the thermal ordering of artificial spin systems.
Here we present a direct experimental investigation of the thermal ordering in a two dimensional Ising system composed of an array of elongated amorphous CoFeZr thin film islands. The shape anisotropy of the elongated magnetic islands confines the magnetization to a fixed axis creating Ising-like macrospins. During the growth of the array thermalization occurs providing a limited time window for thermal dynamics. As the islands become thicker the dynamics slow down and the thermalized state of the array becomes frozen in. Subsequently, the thermally ordered as-grown state can be locally investigated by magnetic force microscopy allowing a statistical analysis of the ordering of the artificial spins to be performed.