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arXiv 1106.4491cond-mat.mes-hall
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Co层厚度可变的[Co/Pd] 8多层膜的可调磁振频率和阻尼

Tunable Magnonic Frequency and Damping in [Co/Pd]8 Multilayers with Variable Co Layer Thickness

S. Pal, B. Rana, O. Hellwig, T. Thomson, A. Barman

摘要:

本文报道了具有垂直磁各向异性的[Co/Pd] 8多层膜集体皮秒磁化动力学的实验观察。由于垂直磁各向异性的线性增加,随着Co层厚度从1.0 nm减小到0.22 nm,旋进频率显示出从约5 GHz到约90 GHz的大的和系统的变化。阻尼系数α与Co层厚度成反比,垂直磁各向异性与α之间存在线性关系。我们讨论了阻尼增强的可能原因是界面处的d-d杂化和自旋泵。这些观测结果对这些材料在自旋电子学和磁振子晶体中的应用具有重要意义。

英文摘要:

We report the experimental observation of collective picosecond magnetization dynamics in [Co/Pd]8 multilayers with perpendicular magnetic anisotropy. The precession frequency shows large and systematic variation from about 5 GHz to about 90 GHz with the decrease in the Co layer thickness from 1.0 nm to 0.22 nm due to the linear increase in the perpendicular magnetic anisotropy. The damping coefficient 'alpha' is found to be inversely proportional to the Co layer thickness and a linear relation between the perpendicular magnetic anisotropy and 'alpha' is established. We discuss the possible reasons behind the enhanced damping as the d-d hybridization at the interface and spin pumping. These observations are significant for the applications of these materials in spintronics and magnonic crystals.

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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