FIGURE 1.

Microfabricated probe on a TM specimen. The probe consisted of a base and shearing plate connected by two flexible arms. The probe was capable of applying force in the radial and longitudinal directions, indicated by the arrows in the lower left-hand corner. Displacements applied to the probe base caused bending of the cantilever arms, as illustrated with dashed lines (bending is exaggerated for clarity). The radial fibrillar structure of the TM is readily visible in the image and was used to align the radial and longitudinal axes, the radial axis being parallel to the radial fibrils.