Spin-induced polarizations and nonreciprocal directional dichroism of the room-temperature multiferroic BiFeO3

Randy S. Fishman, Jun Hee Lee, Sándor Bordács, I. Kézsmárki, Urmas Nagel, Toomas Rõõm

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A microscopic model for the room-temperature multiferroic BiFeO3 that includes two Dzyaloshinskii-Moriya interactions and single-ion anisotropy along the ferroelectric polarization predicts both the zero-field spectroscopic modes as well as their splitting and evolution in a magnetic field. Due to simultaneously broken time-reversal and spatial-inversion symmetries, the absorption of light changes as the magnetic field or the direction of light propagation is reversed. We discuss three physical mechanisms that may contribute to this absorption asymmetry known as nonreciprocal directional dichroism: the spin current, magnetostriction, and single-ion anisotropy. We conclude that the nonreciprocal directional dichroism in BiFeO3 is dominated by the spin-current polarization and is insensitive to the magnetostriction and easy-axis anisotropy. With three independent spin-current parameters, our model accurately describes the nonreciprocal directional dichroism observed for magnetic field along [1,-1,0]. Since some modes are almost transparent to light traveling in one direction but opaque for light traveling in the opposite direction, BiFeO3 behaves as a room-temperature optical diode at certain frequencies in the gigahertz to terahertz range. Our work demonstrates that an analysis of the nonreciprocal directional dichroism spectra based on an effective spin model supplemented by first-principles calculations can produce a quantitative microscopic theory of the magnetoelectric couplings in multiferroic materials.

Original languageEnglish
Article number094422
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number9
DOIs
Publication statusPublished - Sep 14 2015

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Dichroism
dichroism
Anisotropy
Magnetostriction
Polarization
Magnetic fields
room temperature
polarization
magnetostriction
Ions
anisotropy
Light propagation
magnetic fields
Temperature
Ferroelectric materials
Diodes
ions
diodes
asymmetry
inversions

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Spin-induced polarizations and nonreciprocal directional dichroism of the room-temperature multiferroic BiFeO3. / Fishman, Randy S.; Lee, Jun Hee; Bordács, Sándor; Kézsmárki, I.; Nagel, Urmas; Rõõm, Toomas.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 92, No. 9, 094422, 14.09.2015.

Research output: Contribution to journalArticle

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