<s>
Some	O
antiferromagnetic	O
materials	O
exhibit	O
a	O
non-zero	O
magnetic	O
moment	O
at	O
a	O
temperature	O
near	O
absolute	B-Application
zero	I-Application
.	O
</s>
<s>
This	O
effect	O
is	O
ascribed	O
to	O
spin	B-General_Concept
canting	I-General_Concept
,	O
a	O
phenomenon	O
through	O
which	O
spins	O
are	O
tilted	O
by	O
a	O
small	O
angle	O
about	O
their	O
axis	O
rather	O
than	O
being	O
exactly	O
co-parallel	O
.	O
</s>
<s>
Spin	B-General_Concept
canting	I-General_Concept
is	O
due	O
to	O
two	O
factors	O
contrasting	O
each	O
other	O
:	O
isotropic	O
exchange	O
would	O
align	O
the	O
spins	O
exactly	O
antiparallel	O
,	O
while	O
antisymmetric	B-General_Concept
exchange	I-General_Concept
arising	O
from	O
relativistic	O
effects	O
(	O
spin	O
–	O
orbit	O
coupling	O
)	O
would	O
align	O
the	O
spins	O
at	O
90°	O
to	O
each	O
other	O
.	O
</s>
