Direct measurement of penetration length in ultra-thin and/or mesoscopic   superconducting structures
  We describe a method for direct measurement of the magnetic penetration length in thin (10 - 100 nm) superconducting structures having overall dimensions in the range 1 to 100 micrometers. The method is applicable for broadband magnetic fields from dc to MHz frequencies. 
L.Hao, J.C.Macfarlane, J.C.Gallop and S.K.H.Lam