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arXiv 1809.04372cond-mat.mes-hallcond-mat.mtrl-sci
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交换耦合双层膜系统光模铁磁共振强度的反常增加

Anomalous increasing of the intensity of field dependence optical mode ferromagnetic resonance in the exchange coupled bilayer system

Wenfeng Wang, Lulu Pan, Wenjie Song, Guozhi Chai, Desheng Xue

摘要:

研究了层间交换耦合Fe $_{20}$ Ni $_{80}$ /Co双层膜的声、光铁磁共振(FMR)。在光学模式中,观察到了在增加的磁场下,谐振频率处的峰值意外增加的趋势。我们提出了解析计算,与Co和Fe $_{20}$ Ni $_{80}$层之间的交换耦合,磁化和面内单轴各向异性,解释的最大值的光学磁导率的增加。实验测量和理论计算都表明,这种趋势依赖于膜层厚度t,并且存在一个临界场,在该临界场以上,光学峰值开始下降。这些结果有助于我们理解层间交换耦合引起的光学FMR的机理,并可能启发我们寻找磁性材料高频应用的新可能性。

英文摘要:

Acoustic and optical ferromagnetic resonance (FMR) in the interlayer exchange coupled Fe$_{20}$Ni$_{80}$/Co bilayer have been investigated. In the optical mode, unexpected increasing tendencies of peak value at the resonance frequency has been observed under an increasing magnetic field. We presented analytical calculations with which the exchange coupling between Co and Fe$_{20}$Ni$_{80}$ layers, the magnetization and the in-plane uniaxial anisotropy are taken into account, to interpret the increasing of the maximum values of the optical permeability. Both experimental measurements and theoretical calculation show that such tendencies are dependent on the layer thickness t, and that there is a critical field above which the optical peak value begins to decrease. These results might help us to understand the mechanism of interlayer exchange coupling induced optical FMR and might enlighten us to find new possibility of high frequency applications of magnetic materials.

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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