Soft magnetic properties of FeCo films with Co underlayer

Bilayered Fe65Co35 (= FeCo)/Co films were prepared by facing targets sputtering with 4 pi M-s similar to 24 kg. The soft magnetic properties of FeCo films were induced by a Co underlayer. H-c decreased rapidly when the Co underlayer was 2 nm or more. The films showed welldefined in- plane uniaxial anisotropy with the typical values of H-ce = 10 Oe and H-ch = 3 Oe, respectively. High frequency characteristics of the films show the films can work at 0.8GHz with real permeability as high as 250. (C) 2006 Elsevier B.V. All rights reserved.