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arXiv 2404.13612cond-mat.stat-mechcond-mat.mes-hallcond-mat.soft
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微磁学的随机热力学

Stochastic Thermodynamics of Micromagnetics

Mingnan Ding, Jun Wu, Xiangjun Xing

AI总结:

本文通过含噪 sLL 方程描述微磁系统,建立轨迹与系综层面的热力学定律及涨落定理,并用数值模拟验证。

摘要:

在本工作中,我们研究微磁系统的随机热力学。我们首先通过将噪声纳入 Landau-Lifshitz(LL)方程来表述微磁系统的随机动力学,该方程描述磁矩的不可逆确定性动力学。所得随机 Landau-Lifshitz(sLL)方程满足细致平衡,这保证在外场固定时,系统收敛至热力学平衡,此时熵产生为零而概率流非零。随后,我们讨论轨迹层面和系综层面的各种热力学变量,并进一步建立热力学第一和第二定律。最后,我们建立涨落定理,并利用数值模拟对其加以验证。

英文摘要:

In this work, we study the stochastic thermodynamics of micro-magnetic systems. We first formulate the stochastic dynamics of micro-magnetic systems by incorporating noises into Landau-Lifshitz (LL) equation, which describes the irreversible and deterministic dynamics of magnetic moments. The resulting stochastic Landau-Lifshitz (sLL) equation obeys detailed balance, which guarantees that, with the external field fixed, the system converges to thermodynamic equilibrium with vanishing entropy production and with non-vanishing probability current. We then discuss various thermodynamic variables both at the trajectory level and at the ensemble level, and further establish both the first and the second laws of thermodynamics. Finally, we establish fluctuation theorems, and verify them using numerical simulations.

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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