A theoretical description of magnetic switching experiments in picosecond field pulses
A theoretical description of magnetic switching experiments in picosecond field pulses
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皮秒场脉冲磁开关实验的理论描述
DOI：
10.1063/1.361979
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
W. Doyle
中科院分区：
文献类型：
--
作者：
L. He;W. Doyle
Siegmann等人报道，当薄膜暴露于仅持续6 ps的20 000 Oe面内脉冲场时，具有20 000 Oe单轴各向异性场的垂直取向CoPt薄膜中的磁化反转。从基于朗道-李夫希茨方程（LLG）的吉尔伯特形式的计算表明，即使阻尼常数α值大于0.5，实验结果也与LLG模型一致。给出了开关时间与各向异性场和外加场的关系，以及外加场与易轴夹角β和α的函数关系。实验表明，可以照亮在这些很短的时间内的阻尼机制。
Siegmann et al. have reported that the magnetization in a perpendicularly oriented CoPt film with a uniaxial anisotropy field of 20 000 Oe was reversed when the film was exposed to a 20 000 Oe in‐plane pulsed field lasting only 6 ps. From a calculation based on the Gilbert form of the Landau–Lifshitz equation (LLG), it is shown that the experimental result is consistent with the LLG model even for values of the damping constant α as larger as 0.5. The dependence of the switching time on the anisotropy field and the applied field are presented as a function of α and the angle β between the applied field and the easy axis. Experiments are suggested which could illuminate the damping mechanism at these very short times.