Abstract
FexW100−x alloys have been fabricated by vapor quenching (i.e., sputtering). The compositions with 40≤x≤70 are amorphous, whereas others with x≤30 and x≥80 are crystalline bcc alloys. Extreme sensitivity of magnetic ordering on structure has been observed. Magnetic ordering occurs in the bcc state, for both the Fe‐ and W‐rich alloys. No magnetic ordering can be detected down to 4.2 K for all the amorphous alloys despite their high Fe content.