Directly probing spin dynamics in insulating antiferromagnets using ultrashort terahertz pulses

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

doi:10.1103/PhysRevB.94.184429

Directly probing spin dynamics in insulating antiferromagnets using ultrashort terahertz pulses

Journal Article · Tue Nov 22 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.184429· OSTI ID:1345937

^[1]; ^[1]; Wang, X. ^[2]; ^[1]; Cheong, S.-W. ^[2]; ^[1]; Taylor, Antoinette Jane ^[1]; ^[1]; ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Rutgers Univ., Piscataway, NJ (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC52-06NA25396; FG02-07ER46382

OSTI ID:: 1345937

Alternate ID(s):: OSTI ID: 1333320

Report Number(s):: LA--UR-16-26221

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 18 Vol. 94; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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