Spin-wave spectroscopy of the Dzyaloshinskii-Moriya interaction in room-temperature chiral magnets hosting skyrmions
Spin-wave spectroscopy of the Dzyaloshinskii-Moriya interaction in room-temperature chiral magnets hosting skyrmions
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DOI：
10.1103/physrevb.95.220406
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发表时间：
2017-05
影响因子：
3.7
通讯作者：
R. Takagi;D. Morikawa;K. Karube;N. Kanazawa;K. Shibata;Gen Tatara;Yusuke Tokunaga;Taka-hisa Arima;Taka-hisa Arima;Y. Taguchi;Y. Tokura;Y. Tokura;S. Seki
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文献类型：
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作者：
R. Takagi;D. Morikawa;K. Karube;N. Kanazawa;K. Shibata;Gen Tatara;Yusuke Tokunaga;Taka-hisa Arima;Taka-hisa Arima;Y. Taguchi;Y. Tokura;Y. Tokura;S. Seki
研究了FeGe和Co-Zn-Mn合金手性磁体自旋波在室温附近的传播特性。基于反向自旋波之间的频移，直接计算了Dzyaloshinskii-Moriya （DM）相互作用的幅度和符号。所获得的磁性参数定量地解释了天旋子的大小、螺旋度及其材料的变化，证明了在这类室温手性磁体中，DM相互作用在天旋子的形成中起决定性作用。因此，自旋波传播光谱可以成为研究大块单相化合物中DM相互作用的有效工具。我们的结果也证明了自旋波二极管在室温下基于手性晶体结构的功能。
Propagation character of spin wave was investigated for chiral magnets FeGe and Co-Zn-Mn alloys, which can host magnetic skyrmions near room temperature. On the basis of the frequency shift between counterpropagating spin waves, the magnitude and sign of Dzyaloshinskii-Moriya (DM) interaction were directly evaluated. The obtained magnetic parameters quantitatively account for the size and helicity of skyrmions as well as their materials variation, proving that the DM interaction plays a decisive role in the skyrmion formation in this class of room-temperature chiral magnets. The propagating spin-wave spectroscopy can thus be an efficient tool to study DM interaction in bulk single-phase compounds. Our results also demonstrate a function of spin-wave diode based on chiral crystal structures at room temperature.