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arXiv 1911.00829cond-mat.mes-hall
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通过单磁振子和双磁振子NV弛豫测量法探测铁磁动力学

Ferromagnetic dynamics detected via one- and two-magnon NV relaxometry

Brendan A. McCullian, Ahmed M. Thabt, Benjamin A. Gray, Alex L. Melendez, Michael S. Wolf, Vladimir L. Safonov, Denis V. Pelekhov, Vidya P. Bhallamudi, Michael … 展开作者

Brendan A. McCullian, Ahmed M. Thabt, Benjamin A. Gray, Alex L. Melendez, Michael S. Wolf, Vladimir L. Safonov, Denis V. Pelekhov, Vidya P. Bhallamudi, Michael R. Page, P. Chris Hammel

摘要:

金刚石中的NV心已被证明是局部表征微波激发铁磁体磁响应的有力工具。迄今为止,这受到FMR激发频率小于NV自旋共振频率的要求的限制。在这里,我们报告NV弛豫的基础上的两个磁振子拉曼过程,使检测频率高于NV频率的FMR。对于高微波驱动功率,我们观察到一个意想不到的场位移的NV响应相对于同时从低阻尼铁氧体薄膜的微波吸收信号。我们表明,场移NV响应是由于二阶Suhl不稳定性。这种不稳定性产生了大量的非平衡磁振子,这些磁振子使NV自旋松弛,即使当均匀模式FMR频率超过NV自旋共振频率时,也是如此,因此排除了NV被单个NV共振磁振子松弛的可能性。我们认为,在高频率的NV响应是由于两个磁振子弛豫过程中,两个磁振子的差频匹配的NV频率,并在低频率下,我们评估的线型的一个磁振子NV弛豫响应自旋波不稳定性理论。

英文摘要:

The NV center in diamond has proven to be a powerful tool for locally characterizing the magnetic response of microwave excited ferromagnets. To date, this has been limited by the requirement that the FMR excitation frequency be less than the NV spin resonance frequency. Here we report NV relaxometry based on a two-magnon Raman-like process, enabling detection of FMR at frequencies higher than the NV frequency. For high microwave drive powers, we observe an unexpected field-shift of the NV response relative to a simultaneous microwave absorption signal from a low damping ferrite film. We show that the field-shifted NV response is due to a second order Suhl instability. The instability creates a large population of non-equilibrium magnons which relax the NV spin, even when the uniform mode FMR frequency exceeds that of the NV spin resonance frequency, hence ruling out the possibility that the NV is relaxed by a single NV-resonant magnon. We argue that at high frequencies the NV response is due to a two-magnon relaxation process in which the difference frequency of two magnons matches the NV frequency, and at low frequencies we evaluate the lineshape of the one-magnon NV relaxometry response using spinwave instability theory.

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