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MA: Fachverband Magnetismus
MA 19: Poster I
MA 19.36: Poster
Dienstag, 1. April 2014, 13:00–15:30, P1
Surface crystallization and magnetic properties in Fe84.3Cu0.7Si4B8P3 and Fe85Cu1Si2B8P4 soft magnetic ribbons — •Elena Lopatina1, Ivan Soldatov1, Rudolf Schäfer1,2, Giselher Herzer3, and Ludwig Schultz1,2 — 1IFW Dresden, Institute for Metallic Materials, Helmholtzstrasse 20, D-01069 Dresden, Germany — 2Institute for Materials Science, TU Dresden, Mommsenstraße 9, D-01069 Dresden, Germany — 3VACUUMSCHMELZE GmbH & Co. KG, Grüner Weg 37, D-63450 Hanau, Germany
In this work, as cast ribbons of Fe84.3Cu0.7Si4B8P3 and Fe85Cu1Si2B8P4 alloys have been annealed at temperatures in the interval 370-550 C in order to bring their amorphous structure into the nanocrystalline state and, as a result, to improve magnetic properties for posterior applications. Structural investigations (XRD) of as cast ribbons have shown that, in the case of the Fe84.3Cu0.7Si4B8P3 alloy, the ribbon surface possesses a strongly textured crystalline structure of large- scale α-Fe particles, while the other alloy, Fe85Cu1Si2B8P4, has slightly crystallized surfaces with randomly oriented α-Fe crystallites. In compliance with the model proposed by Ok and Morrish [1], magneto-optical Kerr investigations confirmed that the surface crystallization causes the development of perpendicular anisotropy in the amorphous bulk. However, the development of in-plane anisotropy on the surface is pronounced only for the alloy with strong surface texture, while the ribbons of the other alloy show no evidence of in-plane anisotropy on the surface. [1] H.N. Ok and A.H. Morrish, Phys. Rev. B 23 (1981) 2257.