交换耦合铁磁体–亚铁磁体异质结构中超快磁化翻转动力学的分析
Analysis of ultrafast magnetization switching dynamics in exchange-coupled ferromagnet-ferrimagnet heterostructures
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中文总结 AI 辅助
本文利用改进的微观三温度模型模拟交换耦合铁磁体–亚铁磁体异质结构的元素分辨全光磁化翻转，揭示材料成分、居里温度、RKKY耦合和光能对翻转阈值与时间的影响。
中文摘要 AI 辅助
迄今为止，铁磁体中的磁化翻转一直局限于电流诱导的自旋轨道转矩效应。最近在交换耦合铁磁体–亚铁磁体异质结构中观察到的与螺旋度无关的全光磁化翻转，拓展了这种超快热驱动磁化翻转的范围和适用性。在此，我们采用改进的微观三温度模型，报告了这种交换耦合系统的元素分辨翻转动力学。我们研究了以下因素对元素分辨的时间分辨磁化动力学的影响：i）铁磁体的居里温度，ii）亚铁磁体成分，iii）长程RKKY交换耦合强度，以及iv）吸收的光能。磁化相空间阐明了RKKY耦合强度和吸收的光能如何影响翻转时间。我们的分析表明，阈值翻转能量取决于亚铁磁体的成分，而翻转时间取决于铁磁体的居里温度以及RKKY耦合强度。该模拟有望为开发更快、更节能的自旋电子学器件提供新的认识。
英文摘要
Magnetization switching in ferromagnets has so far been limited to the current-induced spin-orbit-torque effects. Recent observation of helicity-independent all-optical magnetization switching in exchange-coupled ferromagnet ferrimagnet heterostructures expanded the range and applicability of such ultrafast heat-driven magnetization switching. Here we report the element-resolved switching dynamics of such an exchange-coupled system, using a modified microscopic three-temperature model. We have studied the effect of i) the Curie temperature of the ferromagnet, ii) ferrimagnet composition, iii) the long-range RKKY exchange-coupling strength, and iv) the absorbed optical energy on the element-specific time-resolved magnetization dynamics. The phase-space of magnetization illustrates how the RKKY coupling strength and the absorbed optical energy influence the switching time. Our analysis demonstrates that the threshold switching energy depends on the composition of the ferrimagnet and the switching time depends on the Curie temperature of the ferromagnet as well as RKKY coupling strength. This simulation anticipates new insights into developing faster and more energy-efficient spintronics devices.
