Observation of coherent acoustic phonons and magnons in an antiferromagnet NiO

M. Takahara, H. Jinn, S. Wakabayashi, T. Moriyasu, and T. Kohmoto
Phys. Rev. B 86, 094301 – Published 4 September 2012

Abstract

Ultrafast lattice and spin dynamics in an antiferromagnet NiO were studied via reflection and transmission experiments using polarization spectroscopy along with the pump-probe technique. The damped oscillations observed in the reflection experiment are not of spin origin but can be attributed to an interference effect caused by the probe pulse reflected by a propagating wave packet of acoustic phonons. Terahertz oscillations of coherent magnons were observed in the transmission experiment. Three antiferromagnetic modes were observed at low temperatures. As the temperature increases, the two higher modes degenerate above 250 K and then soften toward the Néel temperature (523 K).

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  • Received 25 April 2012

DOI:https://doi.org/10.1103/PhysRevB.86.094301

©2012 American Physical Society

Authors & Affiliations

M. Takahara, H. Jinn, S. Wakabayashi, T. Moriyasu, and T. Kohmoto

  • Graduate School of Science, Kobe University, Kobe 657-8501, Japan

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Issue

Vol. 86, Iss. 9 — 1 September 2012

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