SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 38: Micro- and Nanostructured Magnetic Materials

MA 38.1: Vortrag

Donnerstag, 30. März 2023, 11:30–11:45, HSZ 401

Chemically modulated Fe-Ni cylindrical nanowires with asymmetric magnetic response — •Claudia Fernandez^1,2, Alba Berja^2,3, Lucia Aballe⁴, Laura Alvaro¹, Carolina Martin⁵, Michael Foerster⁴, Ruy Sanz⁵, Arantzazu Mascaraque², Lucas Perez^1,2, and Sandra Ruiz⁶ — ¹IMDEA Nanoscience, 28049, Spain — ²Materials Physics Department, UCM, 28040, Spain — ³Institute of Ceramics and Glass (CSIC), 28040, Spain — ⁴ALBA Synchrotron, 08290, Spain — ⁵National Institute of Aerospace Technology, 28850, Spain — ⁶MPI for Chemical Physics of Solids, 01187, Germany

The control of the magnetic domain walls (DWs) movement along cylindrical nanowires (NWs) by means of magnetic fields or electric currents is a key aspect in the design of novel spintronic devices. In recent studies, we have demonstrated that local changes in composition along the axis of Fe20Ni80 nanowires can pin the DWs and that the DWs can be moved under the application of magnetic field. Expanding this concept, in this work we propose a gradual change in Fe/Ni ratio along the axial direction of the nanowires in order to create an asymmetric energy landscape with the aim to induce asymmetric domain wall motion. Combining X-ray imaging techniques (XAS and XMCD) we have correlated the chemical structure of single nanowires with their magnetic configuration. In First Order Reversal Curves (FORC) diagrams we have observed that an asymmetry arises evidencing the emerging of asymmetrical magnetization processes in the array.