Instrumental aspects ofmagnetic resonance force microscopy

A novel sample preparation technique for deposition of small volumes from the liquid phase is described. Samples with diameters as small as 0 μm were created with this technique. A series of cantilever geometries was manufactured, with the aim of optimizing the Q-factor. Force sensitivities of 8×10-17 N/√Hz were achieved at room temperature, which is a considerable improvement over commercial cantilevers. Mechanisms which determine Q-factors are discussed briefly. Quantitative understanding of MRFM is absolutely necessary. Calculations of the magnetic field and field gradients for several types of permanent magnets are presented. © 1998 Springer-Verlag.