Localized spin-flip excitations in hexagonal HoMnO3

Ji Yeon Nam, Seung Kim, Hien Thi Minh Nguyen, Xiang Bai Chen, Mahn Soo Choi, Daesu Lee, T. W. Noh, In Sang Yang

Research output: Contribution to journalArticlepeer-review

Abstract

Growing demands for ultra-fast switching of spins have turned attention to optically controlled spintronics, which indeed has recently been demonstrated promising. Here we report localized spin-flip excitations revealed by resonance inelastic light scattering on hexagonal holmium manganite thin films with the magnetic manganese ions substituted by the nonmagnetic gallium ions (HoMn1 − xGaxO3). Our analyses on a broad Raman peak support that the corresponding spin excitation is associated with flipping of all three Mn3+ spins in the elementary trimer of manganese ions and hence maintains the same excitation energy determined by the intrinsic spin–spin interaction between Mn3+ ions. The nonmagnetic gallium ions only reduce the population of the spin excitations by breaking the spin-frustrated triangular network. Such localized spin-flip excitations show another promise towards optically controlled spin devices.

Original languageEnglish
Pages (from-to)2298-2304
Number of pages7
JournalJournal of Raman Spectroscopy
Volume51
Issue number11
DOIs
Publication statusPublished - 2020 Nov

Keywords

  • hexagonal HoMnO
  • multiferroics
  • resonance Raman spectroscopy
  • spin-flip excitations
  • spin-frustrated triangular network

ASJC Scopus subject areas

  • Materials Science(all)
  • Spectroscopy

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