Enhancement of spin wave group velocity in ferrimagnets with angular momentum compensation
Enhancement of spin wave group velocity in ferrimagnets with angular momentum compensation
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DOI：
10.35848/1882-0786/ab916d
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发表时间：
2020-05
影响因子：
2.3
通讯作者：
S. Funada;Y. Shiota;M. Ishibashi;T. Moriyama;T. Ono
中科院分区：
文献类型：
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作者：
S. Funada;Y. Shiota;M. Ishibashi;T. Moriyama;T. Ono
在这项研究中，我们从理论上研究了具有不同角动量的稀土和过渡金属亚铁磁体中的静磁自旋波的性质。高（低）频模式的谐振频率在角动量补偿温度（TA）处具有最低（最高）值。结果发现，这两种共振模式显示在TA的最大群速度。此外，在任何温度下，低频模式显示出比高频模式更高的群速度。我们的研究结果是推动反铁磁自旋波磁振子研究领域的物理和技术发展的关键。
In this study, we theoretically investigated properties of magnetostatic spin waves in rare-earth and transition-metal ferrimagnets with various angular momentum. The resonant frequency of high- (low-) frequency mode has the lowest (highest) value at angular momentum compensation temperature (TA). It was found that both resonance modes show a maximum group velocity at TA. Furthermore, the low-frequency mode shows higher group velocity than the high-frequency mode at any temperature. Our findings are the key to advance both the physics and the technology to develop research field of magnonics based on the antiferromagnetic spin waves.