Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 4: Matter at Low Temperature: Cryotechnique, Cryodetectors and Measuring Devices

TT 4.5: Vortrag

Montag, 23. März 2009, 12:30–12:45, HSZ 105

Development and Characterization of a Micro-Hall Magnetometer and its Application to Molecular Nanomagnets — •A. Sundt, J. Dreiser, and O. Waldmann — Physikalisches Institut, Universität Freiburg, D-79104 Freiburg, Germany

Micro-Hall probes have been proven to be a simple and robust tool to measure magnetization curves m(B) of small magnetic clusters at low temperatures with very high sensitivity [1,2]. We are currently building up such a micro-Hall magnetometer based on a GaAs/AlGaAs 2DEG to study magnetic molecules. Our design aims at extending the temperature range to studies from 1.5 K up to room temperature and obtaining an absolute measure of the samples’ magnetization with high sensitivity. In order to achieve these goals geometric as well as Hall probe parameters are considered.

[1] M. Charalambous et al., Phys. Rev. B 58, 9510 (1998).

[2] H. M. Quddusi et al., Rev. Sci. Instrum. 79, 074703 (2008).