Firstprinciples DzyaloshinskiiMoriya interaction in a noncollinear framework
Abstract
We have derived an expression of the DzyaloshinskiiMoriya (DM) interaction, where all the three components of the DM vector can be calculated independently, for a general, noncollinear magnetic configuration. The formalism is implemented in a real space  linear muffintin orbital  atomic sphere approximation (RSLMTOASA) method. We have chosen the Cr triangular trimer on Au(111) and Mn triangular trimers on Ag(111) and Au(111) surfaces as numerical examples. The results show that the DM interaction (module and direction) is drastically different for collinear and noncollinear states. Based on the relation between the spin and charge currents flowing in the system and their coupling to the noncollinear magnetic configuration of the triangular trimer, we demonstrate that the DM interaction can be significant, even in the absence of spinorbit coupling. This is shown to emanate from the noncollinear magnetic structure, that can induce significant spin and charge currents even with spinorbit coupling is ignored.
 Publication:

arXiv eprints
 Pub Date:
 July 2020
 arXiv:
 arXiv:2007.00358
 Bibcode:
 2020arXiv200700358C
 Keywords:

 Condensed Matter  Materials Science