Measurement of the gradient of the Casimir force between a nonmagnetic   sphere and a magnetic plate
  We measured the gradient of the Casimir force between an Au sphere and a plate made of ferromagnetic metal (Ni). It is demonstrated that the magnetic properties influence the force magnitude. This opens prospective opportunities for the control of the Casimir force in nanotechnology and for obtaining Casimir repulsion by using ferromagnetic dielectrics. 
A. A. Banishev, C.-C. Chang, G. L. Klimchitskaya, V. M. Mostepanenko,   and U. Mohideen
cond-mat.other quant-ph