The magnetostriction and magnetomechanical coupling (k) in the Fe73.5Cu1Nb3Si13.5B9 strips annealed from 300 degrees C to 600 degrees C were investigated. Values of k as high as 0.73 were observed. Magnetostriction dropped from 25 x 10(-6) to 2.5 x 10(-6). Nanocrystalline structure was observed. (C) 1998 Elsevier Science B.V. All rights reserved.