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Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)

MA 19.33: Poster

Tuesday, March 15, 2011, 10:45–13:00, P2

Magnetisation reversal of individual α-Fe nanowires embeded in carbon nanotubes studied by submicron Hall magnetometry — •Kamil Lipert1,2, Stefan Bahr1, Franziska Wolny1, Paola Atkinson1, Uhland Weissker1, Thomas Mühl1, Oliver G. Schmidt1, Bernd Büchner1, and Rüdiger Klingeler21Leibniz Institute for Solid State and Materials Research IFW, 01069 Dresden, Germany — 2Kirchhoff Institute for Physics, INF 227, D-69120 Heidelberg, Germany

We present the fabrication and characterization of a submicron Hall magnetometer which is based on a n-doped GaAs/AlGaAs heterostructure forming a two dimensional electron gas (2DEG). The device is designed for investigating the magnetic properties of individual nanomagnets. Here, we have studied the magnetisation switching and its dependence on temperature (6K<T<70K) and angle between applied magnetic field and tube axis for two single crystalline Fe nanowires with different diameters d1=26 nm and d2=17 nm coated with carbon shells. For the thicker Fe-nanowire, the data imply a noncoherent character of the magnetisation reversal. In contrast, for the wire with d2=17 nm the nucleation fields increase for fields parallel to the wires axis. This observation resembles the Stoner-Wohlfarth model for rotation of magnetisation in unison, even though the nanowire diameter exceeds the critical diameter of coherent rotation (d0=12 nm). In both cases, the temperature dependence of nucleation fields implies that magnetisation switching is a localized process which in case 1 is initiated by curling.

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