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Title: Probing ultrafast spin dynamics through a magnon resonance in the antiferromagnetic multiferroic HoMnO 3

Abstract

Here, we demonstrate an approach for directly tracking antiferromagnetic (AFM) spin dynamics by measuring ultrafast changes in a magnon resonance. We also test this idea on the multiferroic HoMnO 3 by optically photoexciting electrons, after which changes in the spin order are probed with a THz pulse tuned to a magnon resonance. This reveals a photoinduced change in the magnon line shape that builds up over 5–12 picoseconds, which we show to be the spin-lattice thermalization time, indicating that electrons heat the spins via phonons. We compare our results to previous studies of spin-lattice thermalization in ferromagnetic manganites, giving insight into fundamental differences between the two systems. Finally, our work sheds light on the microscopic mechanism governing spin-phonon interactions in AFMs and demonstrates a powerful approach for directly monitoring ultrafast spin dynamics.

Authors:
 [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies
  2. Inha Univ., Icheon (Korea). Dept. of Physics
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:
1340915
Alternate Identifier(s):
OSTI ID: 1326710
Report Number(s):
LA-UR-16-20867
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1701607
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 10; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Material Science

Citation Formats

Bowlan, P., Trugman, S. A., Bowlan, J., Zhu, J. -X., Hur, N. J., Taylor, A. J., Yarotski, D. A., and Prasankumar, R. P. Probing ultrafast spin dynamics through a magnon resonance in the antiferromagnetic multiferroic HoMnO3. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.100404.
Bowlan, P., Trugman, S. A., Bowlan, J., Zhu, J. -X., Hur, N. J., Taylor, A. J., Yarotski, D. A., & Prasankumar, R. P. Probing ultrafast spin dynamics through a magnon resonance in the antiferromagnetic multiferroic HoMnO3. United States. doi:10.1103/PhysRevB.94.100404.
Bowlan, P., Trugman, S. A., Bowlan, J., Zhu, J. -X., Hur, N. J., Taylor, A. J., Yarotski, D. A., and Prasankumar, R. P. Mon . "Probing ultrafast spin dynamics through a magnon resonance in the antiferromagnetic multiferroic HoMnO3". United States. doi:10.1103/PhysRevB.94.100404. https://www.osti.gov/servlets/purl/1340915.
@article{osti_1340915,
title = {Probing ultrafast spin dynamics through a magnon resonance in the antiferromagnetic multiferroic HoMnO3},
author = {Bowlan, P. and Trugman, S. A. and Bowlan, J. and Zhu, J. -X. and Hur, N. J. and Taylor, A. J. and Yarotski, D. A. and Prasankumar, R. P.},
abstractNote = {Here, we demonstrate an approach for directly tracking antiferromagnetic (AFM) spin dynamics by measuring ultrafast changes in a magnon resonance. We also test this idea on the multiferroic HoMnO 3 by optically photoexciting electrons, after which changes in the spin order are probed with a THz pulse tuned to a magnon resonance. This reveals a photoinduced change in the magnon line shape that builds up over 5–12 picoseconds, which we show to be the spin-lattice thermalization time, indicating that electrons heat the spins via phonons. We compare our results to previous studies of spin-lattice thermalization in ferromagnetic manganites, giving insight into fundamental differences between the two systems. Finally, our work sheds light on the microscopic mechanism governing spin-phonon interactions in AFMs and demonstrates a powerful approach for directly monitoring ultrafast spin dynamics.},
doi = {10.1103/PhysRevB.94.100404},
journal = {Physical Review B},
number = 10,
volume = 94,
place = {United States},
year = {Mon Sep 26 00:00:00 EDT 2016},
month = {Mon Sep 26 00:00:00 EDT 2016}
}

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Cited by: 6works
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