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

Abstract

An electromagnon in the magnetoelectric (ME) hexaferrite Ba 0.5Sr 2.5Co 2Fe 24O 41 (Co 2 Z-type) single cystal is identified by time-domain terahertz (THz) spectroscopy. The associated THz resonance is active on the electric field (E ω) 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.

Authors:
 [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
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Research Foundation of Korea (NRF)
Contributing Org.:
Magnetoelectric effect; Multiferroics
OSTI Identifier:
1425289
Alternate Identifier(s):
OSTI ID: 1416836
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 2; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Chun, Sae Hwan, Shin, Kwang Woo, Kim, Hyung Joon, Jung, Seonghoon, Park, Jaehun, Bahk, Young-Mi, Park, Hyeong-Ryeol, Kyoung, Jisoo, Choi, Da-Hye, Kim, Dai-Sik, Park, Gun-Sik, Mitchell, J. F., and Kim, Kee Hoon. Electromagnon with Sensitive Terahertz Magnetochromism in a Room-Temperature Magnetoelectric Hexaferrite. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.120.027202.
Chun, Sae Hwan, Shin, Kwang Woo, Kim, Hyung Joon, Jung, Seonghoon, Park, Jaehun, Bahk, Young-Mi, Park, Hyeong-Ryeol, Kyoung, Jisoo, Choi, Da-Hye, Kim, Dai-Sik, Park, Gun-Sik, Mitchell, J. F., & Kim, Kee Hoon. Electromagnon with Sensitive Terahertz Magnetochromism in a Room-Temperature Magnetoelectric Hexaferrite. United States. doi:10.1103/PhysRevLett.120.027202.
Chun, Sae Hwan, Shin, Kwang Woo, Kim, Hyung Joon, Jung, Seonghoon, Park, Jaehun, Bahk, Young-Mi, Park, Hyeong-Ryeol, Kyoung, Jisoo, Choi, Da-Hye, Kim, Dai-Sik, Park, Gun-Sik, Mitchell, J. F., and Kim, Kee Hoon. Fri . "Electromagnon with Sensitive Terahertz Magnetochromism in a Room-Temperature Magnetoelectric Hexaferrite". United States. doi:10.1103/PhysRevLett.120.027202.
@article{osti_1425289,
title = {Electromagnon with Sensitive Terahertz Magnetochromism in a Room-Temperature Magnetoelectric Hexaferrite},
author = {Chun, Sae Hwan and Shin, Kwang Woo and Kim, Hyung Joon and Jung, Seonghoon and Park, Jaehun and Bahk, Young-Mi and Park, Hyeong-Ryeol and Kyoung, Jisoo and Choi, Da-Hye and Kim, Dai-Sik and Park, Gun-Sik and Mitchell, J. F. and Kim, Kee Hoon},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.120.027202},
journal = {Physical Review Letters},
number = 2,
volume = 120,
place = {United States},
year = {Fri Jan 12 00:00:00 EST 2018},
month = {Fri Jan 12 00:00:00 EST 2018}
}

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