Crystal Structure and Dzyaloshinski-Moriya Micromagnetics

A. Ullah, B. Balamurugan, W. Zhang, S. Valloppilly, X. Z. Li, R. Pahari, L. P. Yue, A. Sokolov, D. J. Sellmyer, R. Skomski

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The relationship between atomic-scale and micromagnetic Dzyaloshinski-Moriya (DM) interactions has been investigated. By analyzing the Lifshitz invariants for different point groups, we have found that there is no unique link between the absence of inversion symmetry and DM interactions. The absence of inversion symmetry is a necessary condition for a net DM interaction in crystals, but several noncentrosymmetric point groups have zero DM interactions. In many cases, the key consideration is whether the crystals are polar and/or chiral. For example, MnSi-type spin spirals, which violate helical spin symmetry, are caused by the insertion of chiral atomic-scale building blocks into an achiral cubic lattice, and the scalar interaction parameter D used to describe the spirals is only loosely related to the DM vector D. It contains, in fact, magnetostatic and magnetocrystalline contributions of unknown magnitude. Finally, we discuss some aspects of the micromagnetism of the skyrmionics of nanoparticles and granular nanostructures.

Original languageEnglish (US)
Article number8685788
JournalIEEE Transactions on Magnetics
Volume55
Issue number7
DOIs
StatePublished - Jul 2019

Keywords

  • Berry phase
  • Dzyaloshinski-Moriya (DM) interactions
  • magnetic anisotropy
  • micromagnetism

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'Crystal Structure and Dzyaloshinski-Moriya Micromagnetics'. Together they form a unique fingerprint.

Cite this