Size-independent Young's modulus of inverted conical GaAs nanowire   resonators
  We explore mechanical properties of top down fabricated, singly clamped inverted conical GaAs nanowires. Combining nanowire lengths of 2-9 $\mu$m with foot diameters of 36-935 nm yields fundamental flexural eigenmodes spanning two orders of magnitude from 200 kHz to 42 MHz. We extract a size-independent value of Young's modulus of (45$\pm$3) GPa. With foot diameters down to a few tens of nanometers, the investigated nanowires are promising candidates for ultra-flexible and ultra-sensitive nanomechanical devices. 
P. Paulitschke, N. Seltner, A. Lebedev, H. Lorenz, E. M. Weig
cond-mat.mes-hall