Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Poster I
MA 15.17: Poster
Dienstag, 18. März 2025, 10:00–12:30, P1
Micro-Hall magnetometry on magnetic grains and nanostructures — •Bereket Ghebretinsae and Jens Müller — Institute of Physics, Goethe University Frankfurt, 60438 Frankfurt (M), Germany
Micro-Hall magnetometry is a highly versatile and extremely sensitive magnetic measurement technique which allows for stray field measurements on micro- to nanosized samples with nanotesla sensitivity. The magnetometer is a Hall sensor based upon an AlGaAs/GaAs heterostructure which hosts a 2DEG whose unparalleled electron mobility in measurements directly translates into an ultrahigh stray-field resolution. Micro-Hall sensors have previously been used for diverse purposes such as resolving the discrete lattice potential inside a YIG thin film [1], pinpointing the onset of the formation of magnetic polarons inside ferromagnetic EuB6 [2] as well as investigating the magnetostatics and the magnetization dynamics of two- and three-dimensional artificial spin ice systems [3]. Here we outline a (PhD) thesis project which intends to exploit the capabilities and the versatility of micro-Hall magnetometry to investigate a variety of magnetic systems of current scientific interest. We explain how micro-Hall measurements on specially prepared micron-sized YIG flakes, exchange-biased ferromagnetic bricks, and most of all, three-dimensional Co3Fe nanotetrapod lattices serve to elucidate their characteristic properties and add upon our current understanding of the magnetism in these systems.
[1] K. Novoselov et al. Nature 426, 812–816 (2003)
[2] M. Pohlit et al. Phys. Rev. Lett. 120, 257201 (2018)
[3] L. Keller et al. Sci Rep. 8, 6160 (2018)
Keywords: Micro-Hall magnetometry; 3D magnetic nanostructures; Magnetic particles; Magnetic sensing; Stray field measurements