Abstract
Magnetic properties of nanomagnetic and biomagnetic systems are investigated usingcantilever magnetometry. In the presence of a magnetic field, magnetic films or particlesdeposited at the free end of a cantilever give rise to a torque on the mechanical sensor,which leads to frequency shifts depending on the applied magnetic field. From thefrequency response, the magnetic properties of a magnetic sample are obtained. Themagnetic field dependences of paramagnetic and ferromagnetic thin films andparticles are measured in a temperature range of 5–320 K at a pressure below10 − 6 mbar. We present magnetic properties of the ferromagnetic materials Fe, Co and Ni atroom temperature and also for the rare earth elements Gd, Dy and Tb at varioustemperatures. In addition, the magnetic moments of magnetotactic bacteria are measuredunder vacuum conditions at room temperature. Cantilever magnetometry is a highlysensitive tool for characterizing systems with small magnetic moments. By reducing thecantilever dimensions the sensitivity can be increased by an order of magnitude.
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