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MA: Fachverband Magnetismus

MA 19: Poster I

MA 19.39: Poster

Dienstag, 1. April 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.