Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Poster I

MA 19.34: Poster

Dienstag, 1. April 2014, 13:00–15:30, P1

Nanoscaled manganese-based hard magnetic materials — •Maik Scholz, Marcel Haft, Markus Gellesch, Sabine Wurmehl, Silke Hampel, and Bernd Buechner — Leibniz-Institute for Solid State and Materials Research - IFW, Dresden, Germany

Nanoscale magnetic materials are interesting not only from a scientific perspective, but also for potential use in industrial applications. The interest foremost arises because of the concomitant change in physical properties when scaling a bulk-material down to its smallest size. While intermetallic materials may be highly sensitive to oxidation at the nanoscale, this is less a problem in oxide materials; yet in both cases, we found that the encapsulation of magnetic nanoparticles inside carbon nanotubes via a wet-chemical process is a versatile tool to control oxidation states of the filling materials. Furthermore the surrounding nanotube defines the maximum diameter for the filling particles which determines the magnetic properties of the filling material. Here we present results on the magnetic properties of several manganese oxides inside the cavity of carbon nanotubes. The samples were investigated by magnetometry besides electron microscopy, X-ray diffraction and energy dispersive X-ray spectroscopy. The nanoparticles inside carbon nanotubes exhibit enhanced magnetic performance which is most visible in the increased coercitivity (0.92 MA/m) which is higher than the respective bulk material (0.24 MA/m). In future we aim to control the oxidation state of manganese in a way that allows us, also to synthesize nanoparticles of binary or ternary manganese-based intermetallic materials inside the inner cavity carbon nanotubes.