Observation of coherent acoustic phonons and magnons in an antiferromagnet NiO

M. Takahara; H. Jinn; S. Wakabayashi; T. Moriyasu; T. Kohmoto

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Observation of coherent acoustic phonons and magnons in an antiferromagnet NiO

机译：反铁磁体NiO中相干声子和磁振子的观测

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Ultrafast lattice and spin dynamics in an antiferromagnet NiO were studied via reflection apd 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 Neel temperature (523 K).

机译：通过使用极化光谱技术结合泵浦探针技术的反射apd透射实验研究了反铁磁体NiO中的超快晶格和自旋动力学。反射实验中观察到的阻尼振荡并非自旋，而是归因于声子的传播波包所反射的探测脉冲引起的干扰效应。在透射实验中观察到相干磁振子的太赫兹振荡。在低温下观察到三种反铁磁模式。随着温度的升高，这两个较高的模式在〜250 K以上时退化，然后向Neel温度（523 K）软化。

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来源
《Physical review》 |2012年第9期|p.094301.1-094301.4|共4页
作者
M. Takahara; H. Jinn; S. Wakabayashi; T. Moriyasu; T. Kohmoto;
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作者单位

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

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

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

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

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

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正文语种 eng
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关键词
spin waves; antiferromagnetics;

机译：自旋波反铁磁;

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Observation of coherent acoustic phonons and magnons in an antiferromagnet NiO

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