Neutron Scattering

.
occur only in the non-spin flip channel, which verifies their non-magnetic origin.
In the
spin-flip channel we see the paramagnetic scattering with a decay that is characteristic
for the form factor of the ion -Mn 2+ .
The next example in Fig .
4 .11 shows the separation between nuclear and magnetic
Bragg peaks for a-Fe 203 .
The magnetic Bragg peaks appear in the spin-flip channel only,
while only nuclear Bragg peaks appear in the non-spin-flip channel, if P I j Q .
800
. Co
n
ô
C
700
600
500
400
300
200
100
O
700
_
T-114 410)-1112)(1ÎOi(210)-(220)1321)13~)(310)'
NUCLEAR + PEAKS
FLIPPER OFF
I %
W
AI(M)
;
à,
ß .
a~ 1
A9200)
Il I a
,y
1
I
(412)
600
t171)(100) I' 1(21OHtii) (223)(2f0 3f0)
c 500
400
n
300
(311} (333)(334)
r
I
MA6NE TIC PEAKS
PER ON
!NM 1
40 20 30 40
SCATTERING ANGLE (deq)
Figure 4 .11 :
Separation of magnetic and nuclear Bragg peaks for powder diffraction data
from a-Fe203 . [7]