SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster Magnetism II
MA 40.37: Poster
Donnerstag, 30. März 2023, 14:00–16:00, P2/EG
Micro-Hall magnetometry for multiscale magnetic measurements — •Bereket Ghebretinsae1, Charu Garg1, Martin Lonsky1, Mohanad Al Mamoori1, Michael Huth1, Christian Schröder2, Priscila Rosa3, and Jens Müller1 — 1Institute of Physics, Goethe University, 60438 Frankfurt (M), Germany — 2Institute for Applied Materials Research, University of Applied Sciences Bielefeld, Bielefeld 33619, Germany — 3Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
Micro-Hall magnetometry is a technique that allows for ultra-sensitive magnetic stray field measurements on macro- to micro- to nanoscaled samples. The magnetometer is a Hall sensor that utilizes the very high electron mobility of a two-dimensional electron gas inside a GaAs/AlGaAs heterostructure to resolve even smallest changes in the sample’s stray field almost instantaneously. The technique is unique especially in its versatility. Firstly, the Hall sensor itself can serve as a substrate for the growth of nanoscaled magnetic samples with complex geometries. Secondly, microscopic and even macroscopic samples can be placed directly ontop of the sensor surface such that the stray field emanating from the surface of the sample is captured by the Hall sensor. Here we demonstrate the utility of this technique using (i) 3D ferromagnetic FeCo nanostructures and (ii) single crystalline micro-sized Eu5In2Sb6 with two antiferromagnetic transitions. We present magnetic field- and temperature dependent micro-Hall measurements to explain the details of the technique and prove its usefulness as a tool for the study of multiscale magnetic phenomena.