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arXiv 1008.2177cond-mat.mes-hall
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惯性区磁化动力学:短时间尺度章动预测

Magnetization dynamics in the inertial regime: nutation predicted at short time scales

M. -C. Ciornei, J. M. Rubí, J. -E. Wegrowe

摘要:

将铁磁自由度的相空间扩大到角动量,重新考虑了磁化强度的动力学方程。在介观非平衡态热力学理论框架下,导出了包含惯性项的广义Landau-Lifshitz-Gilbert方程和相应的Fokker-Planck方程。一个典型的弛豫时间$τ$介绍描述的磁化加速度从惯性制度向由一个恒定的拉莫尔频率定义的进动制度的弛豫。对于大于$τ$的时间尺度,恢复通常的吉尔伯特方程。对于低于$τ$的时间尺度,章动和相关的惯性效应进行了预测。惯性机制为在磁性器件中实现超快磁化切换提供了新的机会。

英文摘要:

The dynamical equation of the magnetization has been reconsidered with enlarging the phase space of the ferromagnetic degrees of freedom to the angular momentum. The generalized Landau-Lifshitz-Gilbert equation that includes inertial terms, and the corresponding Fokker-Planck equation, are then derived in the framework of mesoscopic non-equilibrium thermodynamics theory. A typical relaxation time $τ$ is introduced describing the relaxation of the magnetization acceleration from the inertial regime towards the precession regime defined by a constant Larmor frequency. For time scales larger than $τ$, the usual Gilbert equation is recovered. For time scales below $τ$, nutation and related inertial effects are predicted. The inertial regime offers new opportunities for the implementation of ultrafast magnetization switching in magnetic devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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