A detailed analysis of high-resolution magnetisation data reveal that the c
ritical behaviour of chemically well-homogenised high-purity disordered Cr7
0Fe30 and Cr75Fe25 alloys near the paramagnetic (PM)-ferromagnetic (FM) pha
se transition is similar to that of a three-dimensional Heisenberg ferromag
net. An ion-beam sputtered Cr70OFe30 thin film of 9.4 nm thickness exhibits
the same critical behaviour as that of the bulk Cr70Fe30. (C) 2001 Elsevie
r Science B.V. All rights reserved.