Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 43: Micro- and Nanostructured Magnetic Materials IV
MA 43.6: Vortrag
Mittwoch, 16. März 2011, 18:15–18:30, HSZ 103
An individual iron nanowire-filled carbon nanotube probed by micro-Hall magnetometry — •Stefan Bahr1, Kamil Lipert1,2, Franziska Wolny1, Paola Atkinson1, Uhland Weißker1, Thomas Mühl1, Oliver G. Schmidt1, Bernd Büchner1, and Rüdiger Klingeler2 — 1Leibniz Institute for Solid State and Materials Research IFW, 01069 Dresden, Germany — 2Kirchhoff Institute for Physics, INF 227, D-69120 Heidelberg, Germany
We report on the magnetic properties of an individual, high-quality single-crystalline iron nanowire with diameter d=26 nm. The nanowire is embedded in a carbon nanotube which provides complete shielding against oxidation.
The magnetic properties are investigated by micro-Hall magnetometry which has a potential sensitivity of up to 104 µB. We use a two-dimensional electron gas confined in an n-type GaAs/AlGaAs modulation doped heterostructure 90 nm below the surface to measure the magnetic stray fields of our individual iron nanowire.
Magnetization reversal of the individual iron nanowire is associated with domain wall formation where domain nucleation is initiated by curling. The observed nucleation fields of up to 900 mT at low temperatures are much higher than reported previously and nearly reach the shape anisotropy field of iron nanowires.