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arXiv 1306.6268cond-mat.mes-hall
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铁磁体中横向磁弹性波的激励、传播和探测

Actuation, propagation, and detection of transverse magnetoelastic waves in ferromagnets

Akashdeep Kamra, Gerrit E. W. Bauer

摘要:

我们研究了超声波在铁磁介质中的传播,特别注意了与超声激励器交界处的边界条件。在类比导体中的电荷和自旋输运,我们制定了通过系统的散射问题的能量输运。我们发现,磁弹性耦合导致一个非零的磁(弹性)能量伴随声(自旋)波的共振增强效应周围的色散关系反交叉点。我们证明了通过声波注入周围的铁磁共振频率的磁化动力学的激发的物理。

英文摘要:

We study propagation of ultrasonic waves through a ferromagnetic medium with special attention to the boundary conditions at the interface with an ultrasonic actuator. In analogy to charge and spin transport in conductors, we formulate the energy transport through the system as a scattering problem. We find that the magneto-elastic coupling leads to a non-vanishing magnetic (elastic) energy accompanying the acoustic (spin) waves with a resonantly enhanced effect around the dispersion relation anti-crossing point. We demonstrate the physics of excitation of magnetization dynamics via acoustic waves injection around the ferromagnetic resonance frequency.

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