Generalized model of magnon kinetics and subgap magnetic noise
Generalized model of magnon kinetics and subgap magnetic noise
复制标题
磁振子动力学和亚能隙磁噪声的广义模型
DOI：
10.1103/physrevb.105.184406
复制
发表时间：
2022
影响因子：
3.7
通讯作者：
Tserkovnyak, Yaroslav
中科院分区：
文献类型：
--
作者：
Fang, Haocheng;Zhang, Shu;Tserkovnyak, Yaroslav
磁噪声光谱提供了磁性材料中自旋动力学的非侵入性探测。我们考虑具有磁振子激发的二维磁有序绝缘体，特别是那些支持长距离磁振子输运的绝缘体，其中氮空位（NV）中心使得能够进入（接近）磁振子弹道输运状态。我们开发了一种广义理论来描述各种长度尺度上的磁振子输运。纵向动态自旋磁化率源自玻尔兹曼方程并扩展到 Lindhard 形式，该形式通过自旋守恒磁振子碰撞和自旋弛豫进行修改。我们的结果与长度尺度远大于（小于）磁振子平均自由程的扩散（弹道）模型一致，并提供了中间状态的描述。我们还对不同磁振子输运方式下的 NV 跃迁率进行了预测。
Magnetic noise spectroscopy provides a noninvasive probe of spin dynamics in magnetic materials. We consider two-dimensional magnetically ordered insulators with magnon excitations, especially those supporting long-distance magnon transport, where nitrogen-vacancy (NV) centers enable the access to (nearly) ballistic transport regime of magnons. We develop a generalized theory to describe the magnon transport across a wide range of length scales. The longitudinal dynamic spin susceptibility is derived from the Boltzmann equation and extended to a Lindhard form, which is modified by both the spin-conserving magnon collisions and spin relaxation. Our result is consistent with the diffusive (ballistic) model for the length scale much larger (smaller) than the magnon mean free path, and provides a description for the intermediate regime. We also give a prediction for the NV transition rate in different magnon transport regimes.
在结晶抗磁铁氧化铁中可调长距离自旋转运。
影响因子：
64.8
作者：
Lebrun R;Ross A;Bender SA;Qaiumzadeh A;Baldrati L;Cramer J;Brataas A;Duine RA;Kläui M
通讯作者：
Kläui M