Giant Magnetic Anisotropy Induced by Ligand LS Coupling in Layered Cr Compounds

Dong Hwan Kim, Kyoo Kim, Kyung Tae Ko, Junho Seo, Jun Sung Kim, Tae Hwan Jang, Younghak Kim, Jae Young Kim, Sang Wook Cheong, Jae Hoon Park

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32 Scopus citations

Abstract

We propose a novel origin of magnetic anisotropy to explain the unusual magnetic behaviors of layered ferromagnetic Cr compounds (3d3) wherein the anisotropy field varies from 0.01 to ∼3 T on changing the ligand atom in a common hexagonal structure. The effect of the ligand p orbital spin-orbit (LS) coupling on the magnetic anisotropy is explored by using four-site full multiplet cluster model calculations for energies involving the superexchange interaction at different spin axes. Our calculation shows that the anisotropy energy, which is the energy difference for different spin axes, is strongly affected not only by the LS coupling strength but also by the degree of p-d covalency in the layered geometry. This anisotropy energy involving the superexchange appears to dominate the magnetic anisotropy and even explains the giant magnetic anisotropy as large as 3 T observed in CrI3.

Original languageEnglish (US)
Article number207201
JournalPhysical review letters
Volume122
Issue number20
DOIs
StatePublished - May 24 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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