Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: POSTER Ia
MA 19.32: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Magnetic domain wall sensing — •Benjamin Borie1,2, Johannes Paul2, Matthias Bürkle2, Mathias Kläui1, and Hubert Grimm2 — 1Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany — 2Sensitec GmbH, 55131 Mainz, Germany.
An extensive effort is made by industry to introduce magnetic technologies using domain walls into sensors [1]. Domain wall quasiparticles are of interest for storing the state of a device and they can be operated at very low power. Magnetic domain walls are strongly influenced by the external and internal parameters of the material, the shape and the environment of the device. To reduce undesired effects such as non-reproducible operation, the device materials and geometries need to be engineered and high reproducibility can be achieved [2]. We study the influence of roughness, crystallisation, shape and material stacks on the magnetic operating field window of a free layer of a multi-turn sensor driven by a rotating external field. The magnetic operating window is limited by the nucleation field and the propagation field. The roughness and crystallisation are likely to induce a potential landscape that can result in a decrease of the nucleation field and the stacks may induce an asymmetry in this value. A large number of samples can be rapidly fabricated and tested by Kerr microscopy technique and using the GMR effect to ascertain the necessary statistics.
[1] Marco Diegel, et. al., IEEE Transaction on magnetics, vol.45, No.10, October 2009 [2] A. Bisig et al., Nature Communications 4, 2328 (2013).