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Nonreciprocal linear dichroism observed in electron spin resonance spectra of the magnetoelectric multiferroic Pb(TiO)Cu4(PO4)4

Mitsuru Akaki1,2,*, Kenta Kimura3, Yasuyuki Kato4, Yuya Sawada2, Yasuo Narumi2, Hitoshi Ohta1, Tsuyoshi Kimura3, Yukitoshi Motome4, and Masayuki Hagiwara2

  • 1Molecular Photoscience Research Center, Kobe University, Kobe, Hyogo 657-8051, Japan
  • 2Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
  • 3Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
  • 4Department of Applied Physics, The University of Tokyo, Hongo, 7-3-1 Bunkyo, Tokyo 113-8656, Japan

  • *akaki@crystal.kobe-u.ac.jp
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Phys. Rev. Research 3, L042043 – Published 17 December, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.L042043

Abstract

It is known that magnetic excitations in magnetoelectric multiferroics can be induced by the oscillation of electric polarization, called electromagnons, which often cause nonreciprocal optical phenomena. Energy diagrams of the excitations in the magnetoelectric multiferroic Pb(TiO)Cu4(PO4)4 were obtained in wide ranges of magnetic fields up to 50 T and frequencies below 2 THz. Some of the observed resonance modes were reproduced qualitatively by a numerical analysis based on the generalized spin-wave theory. Moreover, we found that electron spin resonance (ESR) signals on some of the modes can be modulated by applying an electric field. This result implies the presence of nonreciprocal linear dichroism on the ESR signals in Pb(TiO)Cu4(PO4)4.

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References (25)

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Phys. Rev. Research 3, L042043– Published 17 December, 2021
  • Received 17 September 2021
  • Accepted 30 November 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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