Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.14: Poster

Dienstag, 8. März 2016, 09:30–12:30, Poster B1

Micro Hall-Magnetometry: Studying magnetic nanostructures using First Order Reversal Curves (FORC) — •Merlin Pohlit, Paul Eibisch, Fabrizio Porrati, Antonia Morherr, Michael Huth, and Jens Müller — Institute of Physics, Goethe-University, Frankfurt a. M., Germany

Micro Hall-Magnetometry is a sensitive technique that allows to study the local magnetic induction of macroscopic samples as well as to perform high-resolution measurements of individual or small arrays of magnetic micro- and nanoparticles. For the latter experiments, six adjacent Hall-crosses that are tailored by electron beam lithography to fit to the samples’ dimensions provide continuous access to the magnetization via the stray field emanating from the particles during magnetization reversal. While particular techniques for studying magnetic interaction effects within macroscopic samples like First Order Reversal Curves (FORC) or Henkel plots are well-established, the same methods are only scarcely applied in the research field of interacting nanomagnets. Here, we first demonstrate a proof-of-concept experiment by studying a floppy disk sample, thereby reproducing literature results, and comparing FORC diagrams obtained by using a micron-sized Hall-sensor and data collected by a commercial vibrating sample magnetometer. Subsequently, FORC data are obtained for a single Cobalt nanomagnet and will be presented alongside FORC measurements of dipolar-coupled arrays of Co nanoislands, i.e. the building blocks of artificial square spin ice^[1,2]. ^[1]Pohlit et al., J. Appl. Phys. 117, 17C746 (2015) ^[2]Pohlit et al., JMMM, 10.1016/j.jmmm.2015.08.072 (2015)