Dresden 2017 – scientific programme

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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 Chen^2,3, Manuel Vázquez², Michael Farle^1,4, 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 (M_R) and large coercive field (H_C). It has been shown recently that M_R and H_C 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 H_C is 50 mT, while the relative increase is 50% and 24% for H_C and M_R at 300 K. [1] S. Liébana-Viñas et al., Nanotechnology 26, 415704 (2015).