Magnetic resonance in amorphous FexB100-xsputtered films

We present magnetic resonance data on amorphous Fe
x
B
100-x
sputtered films in the concentration range
21 \leq x \leq 53
. Simple ferromagnetism prevails for
x \geq 50
and while reentrant magnetism is observed in the range
40 \leq x \leq 50
, the spin glass state persists down to
x \simeq 26
. A finite moment exists even in a-Fe
21
B
79
which is paramagnetic for
T \geq 4
K. These results are in marked contrast to a recent report on this system which adduced not only the disappearance of ferromagnetism at
x\simeq38
but also vanishing of the Fe moment.