Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.49: Poster

Tuesday, April 2, 2019, 10:00–13:00, Poster E

Simulations of magnetic domain wall propagation in width-modulated wires — •Olga Lozhkina, Pascal Kraunscheid, Robert Reeve, Gerhard Jacob, and Mathias Kläui — Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany

Magnetic domain walls (DWs) are of interest to the sensor industry due to their stability at room temperature and their ability to be nucleated and propagated by fields in wires, attributes which can be exploited for multi-turn sensors [1]. DW propagation and pinning depend on many factors that must be carefully controlled for reliable devices. DW propagation below the Walker field is the most robust, but in most cases the Walker field is close to the field required to propagate the DWs, resulting in a small operating window. Periodic modulations of the wire width have been proposed to suppress the Walker breakdown [2], which would be advantageous for such sensors. We performed simulations of DW propagation through Py wires with modulated width using mumax3 . Our simulations show that the longitudinal distance before DW transformation (Walker period) gradually drops with increasing field and tends to a certain limit depending on the wire cross-section. For thinner wires with energetically stable transverse DWs, width modulation with a period smaller than this limit leads to a significant increase of the Walker field. Thereby magnetic wire modulation may enhance the robustness of sensor operation and enlarge in particular the field operation window. [1] B. Borie et al., Appl. Phys. Lett. 111, 242402 (2017) [2] J. Ieda et al. J. Magn. Magn. Mater. 322, 1363 (2010)