We developed the fully automatic permeameter which is made of driving plate
s and shielded loop coil available in 1 MHz-3GHz. We clarified the sensitiv
ity of the permeameter and the sensitivity can be explained by an uncertain
ty of network analyzer. We evaluate the permeability of striped CoNbZr film
s (50, 20, 10 mu m wide). A reasonable relation between permeability spectr
um and domain observations can be demonstrated. (C) 2000 American Institute
of Physics. [S0021-8979(00)91608-6].