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Types of Magnetic Order
Six types of magnetic order are recognised.
They are defined on Q STYP cards by
the words:
- FERO
- Ferromagnetic and unmagnetised so all possible
domains are equally populated.
- FERA
- Ferromagnetic and magnetised in the direction of the z
diffractometer axis.
- ANTI
- A simple commensurate antiferromagnetic structure.
- AMOD
- A possibly incommensurate amplitude modulated structure; this
differs from ANTI in that the relative phases of the modulation at the
different symmetrically related sub-lattices may need to be defined.
- HELI
- A possibly incommensurate helical structure.
It differs from AMOD
because the magnitude and direction of both spin components which define the
helical envelope must be defined. They are necessarily perpendicular to one
another.
- PARA
- Paramagnetic magnetised in the direction of the z
diffractometer axis (only recognised by
CHILSQ.
P.J. Brown - Institut Laue Langevin, Grenoble, FRANCE. e-mail brown@ill.fr