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research article

Magnetic order dynamics in optically excited multiferroic TbMnO3

Johnson, J. A.
•
Kubacka, T.
•
Hoffmann, M. C.
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2015
Physical Review B

We performed ultrafast time-resolved near-infrared pump, resonant soft x-ray diffraction probe measurements to investigate the coupling between the photoexcited electronic system and the spin cycloid magnetic order in multiferroic TbMnO3 at low temperatures. We observe melting of the long range antiferromagnetic order at low excitation fluences with a decay time constant of 22.3 +/- 1.1 ps, which is much slower than the similar to 1 ps melting times previously observed in other systems. To explain the data, we propose a simple model of the melting process where the pump laser pulse directly excites the electronic system, which then leads to an increase in the effective temperature of the spin system via a slower relaxation mechanism. Despite this apparent increase in the effective spin temperature, we do not observe changes in the wave vector q of the antiferromagnetic spin order that would typically correlate with an increase in temperature under equilibrium conditions. We suggest that this behavior results from the extremely low magnon group velocity that hinders a change in the spin-spiral wave vector on these time scales.

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Type
research article
DOI
10.1103/PhysRevB.92.184429
Web of Science ID

WOS:000365773100008

Author(s)
Johnson, J. A.
Kubacka, T.
Hoffmann, M. C.
Vicario, C.
De Jong, S.
Beaud, P.
Gruebel, S.
Huang, S. -W.
Huber, L.
Windsor, Y. W.
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Date Issued

2015

Publisher

Amer Physical Soc

Published in
Physical Review B
Volume

92

Issue

18

Article Number

184429

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GR-HAU  
Available on Infoscience
February 16, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/124039
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