Dresden 2003 – wissenschaftliches Programm

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MA: Magnetismus

MA 19: Mikro- und nanostrukturierte Materialien I

MA 19.5: Vortrag

Mittwoch, 26. März 2003, 16:15–16:30, HSZ/405

Magnetic properties of aligned Fe-filled carbon nanotubes — •Thomas Mühl¹, Dieter Elefant¹, Andreas Graff¹, Radinka Kozhuharova², Ingolf Mönch¹, Manfred Ritschel¹, Paul Simon³, Stefka Groudeva-Zotova², and Claus Schneider¹ — ¹IFW Dresden, Helmholtzstr. 20, 01069 Dresden — ²On leave of absence from the Institute of Electronics, BAS, Sofia, Bulgaria — ³TU Dresden, 01069 Dresden

We report on the magnetic properties of Fe-filled multi-walled carbon nanotubes (MWNTs) grown by chemical vapor deposition on Si substrates with ferrocene as precursor. The MWNTs are aligned perpendicularly to the substrate plane. X-ray diffraction analyses indicate the presence of both bcc and fcc iron with a relatively strong texture. Magnetometry measurements show a pronounced magnetic anisotropy with the easy axis perpendicular to the substrate plane and parallel to the axis of the aligned MWNTs, respectively. The low-temperature behavior suggests a negligible coupling between the two iron phases. We accessed the magnetic properties of individual Fe-filled MWNTs by electron holography using a transmission electron microscope.