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MA: Fachverband Magnetismus

MA 59: Posters Magnetism III

MA 59.27: Poster

Freitag, 20. März 2020, 09:00–12:00, P2/EG

Magnetic domain wall propagation in periodically modulated wires — •Olga Lozhkina, Robert Reeve, Gerhard Jakob, and Mathias Kläui — Institut für Physik, Johannes Gutenberg- Universität Mainz, 55099 Mainz, Germany

In thin confined wires where the domain structure is governed by the shape anisotropy, for soft magnetic wires domain walls (DWs) can be described as quasiparticles moving under external field so they can be implemented for magnetic field sensing [1-2]. However, DW propagation mechanism has a complex dependence on field and a high stochasticity of pinning depending on the DW spin structure. The periodic modulation of the magnetic wire width was predicted to suppress the Walker breakdown, thus conserving the DW spin structure. A thorough control of the domain wall spin structure can make the propagation reproducible and evades the sensor failure. Our simulations show that wire width modulation with an appropriate amplitude and period fully suppresses the WB. It was also shown that the wire width modulation decouples brunches at the intersection region of the sensor making the DW propagation reproducible [2]. Experiments utilizing short current pulses producing an Oersted field which displaces the DWs in the magnetic wires and Magneto-Optical Kerr Effect for optical detection of the DWs positions were performed to study the influence of the periodic modulation on the DW propagation in soft magnetic wires. [1] M. Diegel et al., IEEE Trans. Magn. 40, 2655 (2004) [2] B. Borie et al., Phys. Rev. Appl. 8, 024017 (2017) [3] E. Semenova et al., J. Appl. Phys. 124, 153901 (2018)