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

Journal Article · · Physical Review B
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  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies
  2. Inha Univ., Icheon (Korea). Dept. of Physics

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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1340915
Alternate ID(s):
OSTI ID: 1326710
Report Number(s):
LA-UR-16-20867; PRBMDO; TRN: US1701607
Journal Information:
Physical Review B, Vol. 94, Issue 10; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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Cited By (4)

Using ultrashort terahertz pulses to directly probe spin dynamics in insulating antiferromagnets journal April 2018
How to manipulate magnetic states of antiferromagnets journal March 2018
Lattice-mediated magnetic order melting in TbMnO 3 journal March 2018
Coherent phonons in a Bi 2 Se 3 film generated by an intense single-cycle THz pulse journal June 2018