Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 47: Quantum Hall Effect

HL 47.4: Vortrag

Mittwoch, 9. März 2016, 10:15–10:30, H14

Probing magnetic nanostructures with non-diffusive Hall crosses — •Stefan Fasbender¹, Jakob Schluck¹, Mihai Cerchez¹, Thomas Heinzel¹, Klaus Pierz², Sibylle Sievers², and Hans Werner Schumacher² — ¹Heinrich Heine Universität Düsseldorf — ²PTB Braunschweig

Hall sensing is performed on a localized magnetic field pattern using a Hall cross device that can be tuned from diffusive to ballistic by decreasing the temperature. As the ballistic regime is entered, the Hall resistance develops a pronounced peak as a function of the magnetic field amplitude. This non-monotonic response exemplifies qualitatively the failure of conventional Hall sensing with ballistic Hall crosses. It is shown that the magnetization can still be determined from such measurements by a numerical correction based on the Landauer-Buettiker model as long as the functional form of the magnetic field profile is known.