OSA's Digital Library

Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry Van Driel
  • Vol. 26, Iss. 9 — Sep. 1, 2009
  • pp: A35–A51

Terahertz time-domain spectroscopy of electromagnons in multiferroic perovskite manganites [Invited]

N. Kida, Y. Takahashi, J. S. Lee, R. Shimano, Y. Yamasaki, Y. Kaneko, S. Miyahara, N. Furukawa, T. Arima, and Y. Tokura  »View Author Affiliations


JOSA B, Vol. 26, Issue 9, pp. A35-A51 (2009)
http://dx.doi.org/10.1364/JOSAB.26.000A35


View Full Text Article

Enhanced HTML    Acrobat PDF (2338 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

Recent spectroscopic studies at terahertz frequencies for a variety of multiferroics endowed with both ferroelectric and magnetic orders have revealed the possible emergence of a new collective excitation, frequently referred to as electromagnon. It is magnetic in origin, but it becomes active in response to the electric field component of light. Here we give an overview of our recent advance in the terahertz time-domain spectroscopy of electromagnons, or electric-dipole active magnetic resonances, focused on perovskite manganites— R Mn O 3 (R denotes rare-earth ions). The respective electric and magnetic contributions to the observed magnetic resonance are firmly identified by the measurements of the light-polarization dependence using a complete set of the crystal orientations. We extract general optical features in a variety of the spin-ordered phases, including the A-type antiferromagnetic, collinear spin-ordered phase and the ferroelectric b c and a b spiral spin-ordered phases, which are realized by tuning the chemical composition of R, the temperature, and the external magnetic field. In addition to the antiferromagnetic resonances of Mn ions driven by the magnetic field component of light, we clarify that the electromagnon appears only for light that is polarized along the a axis, even in the collinear spin-ordered phase, and it grows in intensity with evolution of the spiral spin order but is independent of the direction of the spiral spin plane ( b c or a b ) or, equivalently, the direction of the ferroelectric polarization P s ( P s c or P s a ). A possible origin of the observed magnetic resonances at terahertz frequencies is discussed by comparing the systematic experimental data presented here with theoretical considerations based on the Heisenberg model.

© 2009 Optical Society of America

OCIS Codes
(160.4760) Materials : Optical properties
(300.6495) Spectroscopy : Spectroscopy, teraherz

History
Original Manuscript: March 16, 2009
Manuscript Accepted: April 15, 2009
Published: June 12, 2009

Citation
N. Kida, Y. Takahashi, J. S. Lee, R. Shimano, Y. Yamasaki, Y. Kaneko, S. Miyahara, N. Furukawa, T. Arima, and Y. Tokura, "Terahertz time-domain spectroscopy of electromagnons in multiferroic perovskite manganites [Invited]," J. Opt. Soc. Am. B 26, A35-A51 (2009)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-26-9-A35

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited