Spin-dependent optical transitions in yttrium iron garnet

Jiunn Chen, Hua Shu Hsu, Fang Yuh Lo

Research output: Contribution to journalArticlepeer-review

Abstract

This study reviewed the electronic structure using density functional theory (DFT) and demostrated the transmission of optical magnetic circular spectrum in probing spin-dependent optical transitions in yttrium iron garnet (YIG). DFT+Uresults suggested that the t2 orbital of tetrahedral irons are polarized by exchange-splittingO(2p) bands. Such polarization was found to be essential for the kinetic exchange and magnetism in YIG. DFT+Uresults also identified the spin-polarized energy gaps in YIG. On the basis of the distinctions of Fe3O4 [J. Chen et al, Phys. Rev. B, 98, 085 141 (2018)] and YIG in electronic band features along with their manifestations in an optical magnetic circular diachroism (OMCD) spectrum, a map of spin-dependent optical transitions in YIG is presented. Based on the analysis ofOMCDspectra at room temperature, the majority-spin and minority-spin gap in YIG are determined to be 2.45 and 2.25 eV, respectively.

Original languageEnglish
Article numberabe013
JournalMaterials Research Express
Volume8
Issue number2
DOIs
Publication statusPublished - 2021 Feb

Keywords

  • Electronic structure
  • Faraday effect
  • Ferrimagnetic
  • First-principle calculation
  • Superexchange

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Metals and Alloys

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