Abstract
In magnetic resonance force microscopy single spin experiments, forces in theattonewton range have to be measured. Non-commercial, soft single crystallinesilicon bar cantilevers with a high quality factor and minimized spring constantshave to be used, in order to improve the detection sensitivity. In our lowtemperature force microscope we obtain force sensitivities of the order of10−18 N Hz−1/2 at 10 K (Gysin 2002 Temperaturerverhalten der Elastizität und inneren Reibungmikromechanischer Resonatoren, Thesis Basel).Micrometre-sized magnetic particles, which generate a magnetic field of 500 G and magneticfield gradients (), are attached on ultrasensitive cantilevers. A severe loss in force sensitivityand a frequency shift are observed while exposing a cantilever with a magnetictip to a homogeneous magnetic field. To minimize the damping losses ofthe cantilevers with ferromagnetic particles, various magnetic materials(e.g. SmCo5, Nd2Fe14B,and Pr2Fe14B) with different grain and domain sizes are investigated. The lowest magnetic dissipation is observedwith SmCo5 and Pr2Fe14B tips. We try to explain the dissipation effect of cantilevers with magnetic tips.
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