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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.46: Poster
Friday, March 24, 2017, 09:30–13:00, P2-EG
Room temperature magnetic hardening of FeCo nanowire arrays — •Fangzhou Wang1, Ruslan Salikhov1, Marina Spasova1, Sara Liébana-Viñas1, Christina Bran2, Yu-Shen Chen2,3, Manuel Vázquez2, Michael Farle1,4, and Ulf Wiedwald1 — 1Faculty of Physics and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Germany — 2Institute of Materials Science of Madrid, CSIC, Madrid, Spain — 3Department of Chemical Engineering and Materials Science, Yuan-Ze University, Chung-Li, Taiwan — 4Center for Functionalized Magnetic Materials (FunMagMa), Immanuel Kant Baltic Federal University, Kaliningrad, Russia
Exploiting the shape anisotropy in combination with the magnetocrystalline anisotropy of 3d-metal nanowires (NW) yields a large energy product, i.e. high remanent magnetization (MR) and large coercive field (HC). It has been shown recently that MR and HC can be significantly enhanced at low temperatures by oxidizing FeCo NW tips [1]. Here, we demonstrate the magnetic hardening of FeCo NWs by interfacing their tips with AFM Fe50Mn50 layers at 300 K. FM NWs with diameter of 40 nm and length of 16 µm were grown in Anodic Aluminum Oxide (AAO) nanopores. Both tips of NWs were opened by partial chemical etching of the AAO membrane and, subsequently, Fe50Mn50 was deposited by rf-sputtering forming an AFM/FM/AFM sandwich structure. As a result, the absolute enhancement of HC is 50 mT, while the relative increase is 50% and 24% for HC and MR at 300 K. [1] S. Liébana-Viñas et al., Nanotechnology 26, 415704 (2015).