Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 60: SC \& MLT: Cryodetectors
TT 60.9: Vortrag
Freitag, 18. März 2011, 13:00–13:15, HSZ 301
Micro-Hall Magnetometer for Molecular Nanomagnets — •Alexander Sundt and Oliver Waldmann — Physikalisches Institut, Universität Freiburg, D-79104 Freiburg, Germany
In recent years the molecular nanomagnets (MNMs), e.g., the single-molecule magnets, have been the subject of many studies, as they exhibit phenomena such as magnetic hysteresis and quantum tunneling of the magnetization, which make them candidates for single molecule data storage devices and bits for quantum computing. To investigate this class of materials it is of apparent importance to measure their magnetization. The micro-Hall probes have been proven to be a highly sensitive and robust method in this direction. In this talk we will present the latest improvements of our in-house built magnetometer. The setup provides now an extended temperature range from 1.4 to 300 K and higher magnetic fields up to 7 T. However, the main improvements were to use: 1) novel micro-Hall sensors providing an increased sensitivity of up to 10−9 emu, 2) a double micro-Hall sensor configuration as well as a mimic, which allows for an in-situ adjustment of the orientation of the micro-Hall sensors to compensate for the main magnetic field, and 3) an improved scheme to measure light-induced magnetism in molecular clusters. The data recorded on several MNMs will be shown and discussed.