We studied giant magnetoimpedance (GMI) effect in commercial crystalline Mu
metal, with the emphasis to sample thickness dependence and annealing effec
ts. By using appropriate heat treatment one can achieve GMI ratios as high
as 310%, and field sensitivity of about 20%/Oe, which is comparable to the
best GMI characteristics obtained for amorphous and nanocrystalline soft ma
gnetic materials. (C) 1999 Elsevier Science Ltd. All rights reserved.