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Title: Directly probing spin dynamics in insulating antiferromagnets using ultrashort terahertz pulses

Abstract

We investigate spin dynamics in the antiferromagnetic (AFM) multiferroic TbMnO3 using opticalpump, terahertz (THz)-probe spectroscopy. Photoexcitation results in a broadband THz transmission change, with an onset time of 25 ps at 6 K that becomes faster at higher temperatures. We attribute this time constant to spin-lattice thermalization. The excellent agreement between our measurements and previous ultrafast resonant x-ray diffraction measurements on the same material confirms that our THz pulse directly probes spin order. We suggest that this could be the case in general for insulating AFM materials, if the origin of the static absorption in the THz spectral range is magnetic.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [1];  [2]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Rutgers Univ., Piscataway, NJ (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1345937
Alternate Identifier(s):
OSTI ID: 1333320
Report Number(s):
LA-UR-16-26221
Journal ID: ISSN 2469-9950; TRN: US1701221
Grant/Contract Number:  
AC52-06NA25396; FG02-07ER46382
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 18; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Material Science

Citation Formats

Bowlan, Pamela Renee, Trugman, Stuart Alan, Wang, X., Dai, Yaomin, Cheong, S.-W., Bauer, Eric Dietzgen, Taylor, Antoinette Jane, Yarotski, Dmitry Anatolievitch, and Prasankumar, Rohit Prativadi. Directly probing spin dynamics in insulating antiferromagnets using ultrashort terahertz pulses. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.184429.
Bowlan, Pamela Renee, Trugman, Stuart Alan, Wang, X., Dai, Yaomin, Cheong, S.-W., Bauer, Eric Dietzgen, Taylor, Antoinette Jane, Yarotski, Dmitry Anatolievitch, & Prasankumar, Rohit Prativadi. Directly probing spin dynamics in insulating antiferromagnets using ultrashort terahertz pulses. United States. doi:10.1103/PhysRevB.94.184429.
Bowlan, Pamela Renee, Trugman, Stuart Alan, Wang, X., Dai, Yaomin, Cheong, S.-W., Bauer, Eric Dietzgen, Taylor, Antoinette Jane, Yarotski, Dmitry Anatolievitch, and Prasankumar, Rohit Prativadi. Tue . "Directly probing spin dynamics in insulating antiferromagnets using ultrashort terahertz pulses". United States. doi:10.1103/PhysRevB.94.184429. https://www.osti.gov/servlets/purl/1345937.
@article{osti_1345937,
title = {Directly probing spin dynamics in insulating antiferromagnets using ultrashort terahertz pulses},
author = {Bowlan, Pamela Renee and Trugman, Stuart Alan and Wang, X. and Dai, Yaomin and Cheong, S.-W. and Bauer, Eric Dietzgen and Taylor, Antoinette Jane and Yarotski, Dmitry Anatolievitch and Prasankumar, Rohit Prativadi},
abstractNote = {We investigate spin dynamics in the antiferromagnetic (AFM) multiferroic TbMnO3 using opticalpump, terahertz (THz)-probe spectroscopy. Photoexcitation results in a broadband THz transmission change, with an onset time of 25 ps at 6 K that becomes faster at higher temperatures. We attribute this time constant to spin-lattice thermalization. The excellent agreement between our measurements and previous ultrafast resonant x-ray diffraction measurements on the same material confirms that our THz pulse directly probes spin order. We suggest that this could be the case in general for insulating AFM materials, if the origin of the static absorption in the THz spectral range is magnetic.},
doi = {10.1103/PhysRevB.94.184429},
journal = {Physical Review B},
number = 18,
volume = 94,
place = {United States},
year = {2016},
month = {11}
}

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