Small-Angle Neutron Scattering - Kfki

Magnetic neutron scattering
Cross-section of the magnetic moment
of one atom in domain:
dσ
dΩ
2 2
( ) = m
vm
p
p - magnetic scattering length
vm
= γ −η ( ηγ )
- magnetic interaction vector
Nuclear + magnetic scattering:
dσ
=
dΩ
b
2
+
2 2
2bp(
vm t ) + vm
p
Mitglied in der Helmholtz-Gemeinschaft
unit vector along the
magnetic moment
direction
ν m
=sinα, α - angle between
unit vector along
the scattering vector
γ
and
q
neutron spin
non-polarized beam:
dσ
=
dΩ
b
disoriented domains:
dσ
dΩ
2
+ v
2
m
p
b
2 v
2 p
2 b
2
= + <
m
>
Ω
= +
2
2 p
3
2