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MA: Fachverband Magnetismus
MA 4: Micro- and Nanostructured Materials
MA 4.5: Vortrag
Montag, 16. März 2015, 10:45–11:00, H 1012
Surface crystallization and magnetic properties of FeCuSiBP soft magnetic ribbons — •Elena Lopatina1,2, Ivan Soldatov1,2, Christian Becker1,2, Viktoria Budinsky3, Mie Marsilius3, Ludwig Schultz1,2, Giselher Herzer3, and Rudolf Schaefer1,2 — 1IFW Dresden, Dresden, Germany — 2Institute for Materials Science, TU Dresden, Dresden, Germany — 3VACUUMSCHMELZE GmbH & Co. KG, Hanau, Germany
Surface crystallization in soft magnetic alloys has been the subject of many studies that were mainly performed by Mossbauer spectroscopy, atomic force microscopy, transmission- and scanning electron microscopy. However, there are only few studies of surface crystallization by means of magneto-optical Kerr microscopy, which allows a direct visualization of the changes in magnetic microstructure that arise from surface crystallization. In this work we report on the influence of surface crystallization on the magnetic properties and magnetic microstructures of FeCuSiBP ribbons by Kerr imaging. The as cast ribbon has been annealed at temperatures in the interval of 370-550 °C, by pulling the ribbon through a furnace, thus applying some tensile stress along the ribbon axis that causes a creep-induced transverse anisotropy into the ribbon. Furthermore, since the vast majority of applications of soft magnetic materials operate under AC conditions, we show by time-resolved Kerr microscopy how the surface domain structure react to ac magnetic fields up to the kHz regime and how the dynamic surface hysteresis loops compare to the inductively measured bulk loops with rising frequency, both on original and etched ribbons.