Probing ultrafast spin dynamics through a magnon resonance in the antiferromagnetic multiferroic HoMnO3

Bowlan, P.; Trugman, S. A.; Bowlan, J.; Zhu, J. -X.; Hur, N. J.; Taylor, A. J.; Yarotski, D. A.; Prasankumar, R. P.

doi:10.1103/PhysRevB.94.100404

Probing ultrafast spin dynamics through a magnon resonance in the antiferromagnetic multiferroic ${HoMnO}_{3}$

Journal Article · Mon Sep 26 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.100404· OSTI ID:1340915

Bowlan, P. ^[1]; Trugman, S. A. ^[1]; Bowlan, J. ^[1]; Zhu, J. -X. ^[1]; Hur, N. J. ^[2]; Taylor, A. J. ^[1]; Yarotski, D. A. ^[1]; Prasankumar, R. P. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies
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.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1340915

Alternate ID(s):: OSTI ID: 1326710

Report Number(s):: LA-UR-16-20867

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 10 Vol. 94; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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How to manipulate magnetic states of antiferromagnets Song, Cheng; You, Yunfeng; Chen, Xianzhe Nanotechnology, Vol. 29, Issue 11 https://doi.org/10.1088/1361-6528/aaa812	journal	March 2018
Lattice-mediated magnetic order melting in TbMnO 3 Baldini, Edoardo; Kubacka, Teresa; Mallett, Benjamin P. P. Physical Review B, Vol. 97, Issue 12 https://doi.org/10.1103/physrevb.97.125149	journal	March 2018
Coherent phonons in a Bi 2 Se 3 film generated by an intense single-cycle THz pulse Melnikov, A. A.; Boldyrev, K. N.; Selivanov, Yu. G. Physical Review B, Vol. 97, Issue 21 https://doi.org/10.1103/physrevb.97.214304	journal	June 2018
Asymmetric Splitting of an Antiferromagnetic Resonance via Quartic Exchange Interactions in Multiferroic Hexagonal HoMnO 3 Laurita, N. J.; Luo, Yi; Hu, Rongwei Physical Review Letters, Vol. 119, Issue 22 https://doi.org/10.1103/physrevlett.119.227601	journal	December 2017

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