Hi all experts in magnetism,
In DM interaction spins tends to misalign from each other to lower the energy. Also, the spin vector remains in the plane of ligand displacement. Please explain following intuitively not mathematically?
1) Where is the role of spin orbit coupling?
2) What is the role of D and its direction?
3) Why is it not the just competition between 180 and 90 degree superexchange?
4) Is the role of spin-orbit coupling to align spins in the same plane?
5) Lowering the symmetry by ligand displacement may be due to adjust of angle between 180 and 90 superexchange?
Please explain and correct these terms.
thanks
Here are my brief answers:
1. Spin-orbit is the prime source of the DM interaction
2. D defines the degree of canting, but it is itself dependent on the crystal symmetry and corresponding symmetry operation between spins i and j
3. DM is actually sometimes referred to as asymmetric part of the superexchange interaction. Normally the symmetric part which defines a trivial AFM ordering is the dominant energy term, but spin-orbit interaction L.S can act as a perturbation canting spin S_i of ion i by angular momentum L_j of ion j.
4. Not necessarily. Refer to my answer 3.
5. Again refer to answer 3.
Article Predicting the Spin-Lattice Order of Frustrated Systems from...
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