Modeling of the Laser-Heating Induced Ultrafast Demagnetization Dynamics in Ferrimagnetic Thin Films

Modeling of the Laser-Heating Induced Ultrafast Demagnetization Dynamics in Ferrimagnetic Thin Films
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亚铁磁薄膜中激光加热诱导超快退磁动力学的建模

DOI:
10.1109/tmag.2013.2252154
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发表时间:
2013-07
影响因子:
2.1
通讯作者:
Yaowen Liu
Yaowen Liu
中科院分区:
工程技术4区
文献类型:
--
作者:
Qinyuan Jin;Qinyuan Jin;Yaowen Liu;Yaowen Liu

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由激光脉冲激发的超快退磁引入了将材料的磁性控制在亚皮秒范围的技术可能性。本文采用随机Landau-Lifshitz-吉尔伯特方程在原子水平上模拟了非晶铁磁TbFeCo合金的退磁动力学。过渡金属(Fe、Co)和稀土(Tb)原子由两个不同的亚晶格系统构成。激光加热引起的退磁过程清楚地显示了一系列的快照。我们的模拟表明,充分退磁的亚皮秒时间尺度上需要一个温度超过居里点,和退磁时间增加的Tb含量。
Ultrafast demagnetization excited by laser pulses introduces the technological possibility for controlling the magnetic properties of materials on sub-picosecond regime. In this paper, the demagnetization dynamics of amorphous ferrimagnetic TbFeCo alloy is modeled by using the stochastic Landau-Lifshitz-Gilbert equation on an atomistic level. The transition metal (Fe, Co) and rare earth (Tb) atoms are constructed by two different sub-lattice systems. Laser-heating induced demagnetization processes are clearly demonstrated by a series of snapshots. Our simulations show that full demagnetization on the sub-picosecond time scale requires a temperature over the Curie point, and the demagnetization time increases with the Tb content.
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