Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 25: Micro- and Nanostructured Magnetic Materials II
MA 25.5: Vortrag
Mittwoch, 25. März 2009, 15:45–16:00, HSZ 403
Magnetization switching in α-Fe filled Carbon nanotubes using micro-Hall gradiometry — •Pintu Das1, Jens Müller1, Steffen Wirth1, Kamil Lipert2, Franziska Wolny2, Thomas Mühl2, Rüdiger Klingeler2, and Bernd Büchner2 — 1Max Planck Institute of Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany — 2Leibniz Institute for Solid State and Materials Research (IFW), Helmholtz Str. 20, 01069 Dresden, Germany
Using the Hall response of a two-dimensional electron gas (2DEG) in GaAs/AlGaAs heterostructures, we employed a micro-Hall gradiometry technique to quantitatively study the magnetization behavior of α-Fe cylinders of diameter ∼ 20 nm, which are filled into Carbon nanotubes (∼ 10 µm long). A Hall cross size of 800 × 800 nm2 has been used for the measurements. From the measurements of a single α-Fe-filled nanotube placed in the active area of the Hall cross (see talk of K. Lipert et al.), clear magnetization switching has been observed. The dependence of the switching field on the angle between the nanotube and the applied magnetic field has been studied in order to identify the switching mode. At certain magnetic fields, we also have observed switching which is not symmetric with respect to the direction of the field. A detailed calculation of the perpendicular stray field due to the α-Fe-filled nanotube at the location of the 2DEG has been carried out to analyze the experimental data. We discuss the results and the analysis to understand the possible mode of the magnetization switching.