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首页> 外文期刊>Physical review.B.Condensed matter and materials physics >Dependence of the magneto-optical signal on the Co layer thickness asymmetry in Co/Pt/Co films
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Dependence of the magneto-optical signal on the Co layer thickness asymmetry in Co/Pt/Co films

机译：磁光信号对Co / Pt / Co膜中Co层厚度不对称的依赖性

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摘要

We have studied the magneto-optical response of Co(t_1)/Pt(d)/Co(t_2) trilayer structures, in which the total Co thickness (t_1 +t_2) was held constant, but the split between the top and bottom layer made variable to investigate the impact of the Co layer thickness asymmetry a_t = (t_1 -t_2)/(t_1 + t_2) as well as the influence of the Pt interlayer thickness d. The optical and magneto-optical properties of these films were measured using generalized magneto-optical ellipsometry. A set of specifically designed inverted double-wedge structures were characterized to determine the influence of d and especially of a_t, which should be significant if quantum-well states are relevantly modified by the Co layer thickness asymmetry. In addition to a Co/Pt interface proximity effect that leads to an overall enhancement of the magneto-optical response, we do not find the expected quadratic a_t effect, but instead observe a strong linear a_t effect. We also compare our experimental results to a classical optics description based upon the transfer matrix method, but we can achieve agreement in between these calculations and our experimental data only if we assume massively anomalous optical wave attenuation in Pt. This perceived anomalous attenuation of Pt is not observed for Co/Pt/Co trilayer structures with much thicker Co films, in which quantum-well states should not be relevant anymore. Thus, the origin of the unexpected strong linear a_t effect in ultrathin Co/Pt/Co trilayers cannot be a local materials modification, but instead must be associated with the collective nature of quantum-mechanical electronic states in asymmetric trilayers.
机译：我们研究了CO（T_1）/ PT（D）/ CO（T_2）三层结构的磁光响应，其中总CO厚度（T_1 + T_2）保持恒定，但顶层和底层之间的分裂使变量研究Co层厚度不对称A_T =（T_1 -T_2）/（T_1 + T_2）的影响以及PT层间厚度D的影响。使用广义磁光椭圆形测量这些膜的光学和磁光性质。一种专门设计的倒双楔形结构的特征在于确定D且尤其是A_T的影响，如果量子阱状态由CO层厚度不对称相关，这应该是显着的。除了有关的CO / PT接口接近效果，导致磁光响应的总体增强，我们没有找到预期的二次A_T效果，而是观察强度的线性A_T效果。我们还基于传输矩阵方法将实验结果与经典光学描述进行比较，但只有在PT中假设大量异常光波衰减时，我们只能在这些计算和我们的实验数据之间实现协议。对于具有多大较厚的CO膜的CO / Pt / Co三层结构，不观察到Pt的这种感知的异常衰减，其中量子井状态不应再相关。因此，超薄CO / Pt / Co三层中出现意外强线性A_T效应的起源不能是局部材料改性，而是必须与不对称三叶层中量子机械电子状态的集体性质相关联。

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  • 来源
    《Physical review.B.Condensed matter and materials physics》 |2020年第21期|214434.1-214434.13|共13页
  • 作者

    Ramon Weber; Carmen Martin Valderrama; Lorenzo Fallarino; Andreas Berger;

  • 作者单位

    CIC nanoGUNE BRTA E-20018 Donostia - San Sebastian Spain University of the Basque Country (UPV/EHU) E-20018 Donostia - San Sebastian Spain;

    CIC nanoGUNE BRTA E-20018 Donostia - San Sebastian Spain Faculty of Science University of Valladolid E-47011 Valladolid Spain;

    CIC nanoGUNE BRTA E-20018 Donostia - San Sebastian Spain;

    CIC nanoGUNE BRTA E-20018 Donostia - San Sebastian Spain;

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