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Title: Electromagnon with Sensitive Terahertz Magnetochromism in a Room-Temperature Magnetoelectric Hexaferrite

Journal Article · · Physical Review Letters
 [1];  [1];  [1];  [2];  [2];  [3];  [3];  [3];  [4];  [3];  [4];  [5];  [1]
  1. Seoul National Univ. (Korea, Republic of). CeNSCMR, Dept. of Physics and Astronomy
  2. Pohang Accelerator Lab., Pohang (South Korea)
  3. Seoul National Univ. (Korea, Republic of). Dept. of Physics and Astronomy, Nano Optics Group
  4. Seoul National Univ. (Korea, Republic of). Center for THz-Bio Application systems, Dept. of Physics and Astronomy
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division

An electromagnon in the magnetoelectric (ME) hexaferrite Ba0.5Sr2.5Co2Fe24O41 (Co2 Z-type) single cystal is identified by time-domain terahertz (THz) spectroscopy. The associated THz resonance is active on the electric field (Eω) of the THz light parallel to the c axis (∥ [001]), whose spectral weight develops at a markedly high temperature, coinciding with a transverse conical magnetic order below 410 K. The resonance frequency of 1.03 THz at 20 K changes -8.7% and +5.8% under external magnetic field (H) of 2 kOe along [001] and [120], respectively. A model Hamiltonian describing the conical magnetic order elucidates that the dynamical ME effect arises from antiphase motion of spins which are coupled with modulating electric dipoles through the exchange striction mechanism. Moreover, the calculated frequency shift points to the key role of the Dzyaloshinskii-Moriya interaction that is altered by static electric polarization change under different H.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Research Foundation of Korea (NRF)
Contributing Organization:
Magnetoelectric effect; Multiferroics
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1425289
Alternate ID(s):
OSTI ID: 1416836
Journal Information:
Physical Review Letters, Vol. 120, Issue 2; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (3)

Multifunctional Hybrid Metasurfaces for Dynamic Tuning of Terahertz Waves journal May 2018
Vibrational spectra of multiferroics with Y- and Z-type hexaferrite structures journal August 2018
Electromagnon Resonance at Room Temperature with Gigantic Magnetochromism journal April 2018

Figures / Tables (4)


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