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Single-Molecule Magnets

Micro-Hall-bar magnetometry

Home-made micro-Hall-bar magnetometer
GaAs 2d electron gas (2DEG) sensor
Temperatures down to 300 mK, fields up to 17 T and sweep rates up to 4 T/s

Fig.1: Schematic of the 2DEG Hall probe magnetometer
Latest result: quasi-linear Mn2Ni3 clusters

Ferromagneticly coupled system with ground spin state S=7 and significant anisotropy of Dmol ≈ -0.5 K
Observation of hysteresis of pronounced quantum-tunneling steps

Fig.2: Low temperature measurement of a Mn2Ni3 complex [1]
[1] Animesh Das, Klaus Gieb, Yulia Krupskaya, Serhiy Demeshko, Sebastian Dechert, Rüdiger Klingeler, Vladislav Kataev, Bernd Büchner, Paul Müller, Franc Meyer; J. Am. Chem. Soc., DOI: 10.1021/ja108740c, 2011
This research is funded by FOR 945: "Nanomagnete: von der Synthese über die Wechselwirkung mit Oberflächen zur Funktion"