Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 50: Poster II

MA 50.2: Poster

Friday, March 15, 2013, 10:30–13:30, Poster D

Exploring the magnetization dynamics and interaction effects of single microparticles with Hall-magnetometry — •Martin Lonsky¹, Merlin Pohlit¹, Sven Heinz¹, Pintu Das¹, Natalija van Well¹, Yuzo Ohno², Hideo Ohno², and Jens Müller¹ — ¹Physikalisches Institut, Goethe-Universität, Frankfurt (M), Germany — ²Laboratory for Nanoelectronics and Spintronics, Tohoku University, Sendai, Japan

Micro-Hall-magnetometry is a powerful technique for studying the magnetization dynamics of micrometer- and nanometer-scale particles. Our sensors are based on the two-dimensional electron gas in GaAs/AlGaAs heterostructures and allow for magnetic stray-field measurements of individual micron-sized particles positioned on one or several lithographically defined Hall crosses. Besides the standard experiment of measuring magnetization switching in ferromagnets, we extend the fields of application of this technique to susceptibility and static and dynamic magnetic flux measurements. In order to further optimize the compatibility with standard fabrication methods of nanotechnology we aim to establish planar contact geometries as opposed to In/Sn soldered contacts. We recently demonstrated the high resolution of our devices by tracking the domain wall dynamics in a single CrO₂ micro-grain that has been positioned with a micromanipulator [1]. A further step will be to study interaction effects between individual grains and the influence of intrinsic and extrinsic pinning on the domain wall dynamics.
P. Das et al., APL 97, 042507 (2010).