Dzyaloshinskii-Moriya interaction mediated by spin-polarized band with Rashba spin-orbit coupling

A. Kundu, Shufeng Zhang

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Dzyaloshinskii-Moriya interaction (DMI) plays a central role in breaking chiral symmetry of magnetic domain wall structure. The recently observed chiral dependence of domain wall structures in ultrathin magnetic films with perpendicular anisotropy indicates the presence of a strong DMI. We calculate the indirect exchange interaction between magnetic ions mediated by spin-polarized conduction electrons with a Rashba spin-orbit coupling. We find the resulting DMI increases with the spin-orbit coupling strength, but decreases with the spin-polarization of the conduction electrons. The estimated DMI magnitude is comparable to the experimental results.

Original languageEnglish (US)
Article number094434
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number9
DOIs
StatePublished - Sep 21 2015

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Domain walls
Orbits
orbits
Magnetic films
Magnetic domains
Spin polarization
Electrons
Ultrathin films
Exchange interactions
Anisotropy
conduction electrons
interactions
domain wall
Ions
magnetic films
magnetic domains
anisotropy
symmetry
polarization
ions

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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AB - Dzyaloshinskii-Moriya interaction (DMI) plays a central role in breaking chiral symmetry of magnetic domain wall structure. The recently observed chiral dependence of domain wall structures in ultrathin magnetic films with perpendicular anisotropy indicates the presence of a strong DMI. We calculate the indirect exchange interaction between magnetic ions mediated by spin-polarized conduction electrons with a Rashba spin-orbit coupling. We find the resulting DMI increases with the spin-orbit coupling strength, but decreases with the spin-polarization of the conduction electrons. The estimated DMI magnitude is comparable to the experimental results.

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