Using ultrashort terahertz pulses to directly probe spin dynamics in insulating antiferromagnets

Bowlan, Pamela Renee; Trugman, Stuart Alan; Yarotski, Dmitry Anatolievitch; Taylor, Antoinette Jane; Prasankumar, Rohit Prativadi

doi:10.1088/1361-6463/aab8da

Using ultrashort terahertz pulses to directly probe spin dynamics in insulating antiferromagnets

Journal Article · Thu Mar 22 00:00:00 EDT 2018 · Journal of Physics. D, Applied Physics

DOI:https://doi.org/10.1088/1361-6463/aab8da· OSTI ID:1481996

^[1]; ^[1]; ^[1]; Taylor, Antoinette Jane ^[1]; ^[1]

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

Terahertz pulses are a direct and general probe of ultrafast spin dynamics in insulating antiferromagnets (AFM). This is shown by using optical-pump, THz-probe spectroscopy to directly track AFM spin dynamics in the hexagonal multiferroic HoMnO₃ and the orthorhombic multiferroic TbMnO₃. Here, our studies show that despite the different structural and spin orders in these materials, THz pulses can unambiguously resolve spin dynamics after optical photoexcitation. Lastly, we believe that this approach is quite general and can be applied to a broad range of materials with different AFM spin alignments, providing a novel non-contact approach for probing AFM order with femtosecond temporal resolution.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: Laboratory Directed Research and Development (LDRD); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1481996

Alternate ID(s):: OSTI ID: 23091731

Report Number(s):: LA-UR--18-22625

Journal Information:: Journal of Physics. D, Applied Physics, Journal Name: Journal of Physics. D, Applied Physics Journal Issue: 19 Vol. 51; ISSN 0022-3727

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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