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首页> 外文期刊>Physical review >Element-selective investigation of femtosecond spin dynamics in NiPd magnetic alloys using extreme ultraviolet radiation
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Element-selective investigation of femtosecond spin dynamics in NiPd magnetic alloys using extreme ultraviolet radiation

机译：极紫外辐射对NiPd磁性合金中飞秒自旋动力学的元素选择研究

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摘要

We studied femtosecond spin dynamics in Ni_xPd_(1-x) magnetic thin films by optically pumping the system with infrared (1.55 eV) laser pulses and subsequently recording the reflectivity of extreme ultraviolet (XUV) pulses synchronized with the pump pulse train. XUV light in the energy range from 20 to 72 eV was produced by laser high-harmonic generation. The reflectivity of XUV radiation at characteristic resonant energies allowed separate detection of the spin dynamics in the elemental subsystems at the M_(2,3) absorption edges of Ni (68.0 and 66.2 eV) and N_(2,3) edges of Pd (55.7 and 50.9 eV). The measurements were performed in transversal magneto-optical Kerr effect geometry. In static measurements, we observed a magnetic signature of the Pd subsystem due to an induced magnetization. Calculated magneto-optical asymmetries based on density functional theory show close agreement with the measured results. Femtosecond spin dynamics measured at the Ni absorption edges indicates that increasing the Pd concentration, which causes a decrease in the Curie temperature T_C, results in a drop of the demagnetization time τ_M, contrary to the τ_M ~ 1/T_C scaling expected for single-species materials. This observation is ascribed to the increase of the Pd-mediated spin-orbit coupling in the alloy.
机译：我们通过用红外（1.55 eV）激光脉冲光学泵浦系统，然后记录与泵浦脉冲序列同步的极紫外（XUV）脉冲的反射率，研究了Ni_xPd_（1-x）磁性薄膜中的飞秒自旋动力学。激光高次谐波产生产生20至72 eV能量范围内的XUV光。 XUV辐射在特征共振能量下的反射率允许单独检测元素子系统中Ni（68.0和66.2 eV）的M_（2,3）吸收边缘和Pd（55.7）的N_（2,3）边缘的自旋动力学和50.9 eV）。以横向磁光克尔效应几何形状进行测量。在静态测量中，由于感应磁化，我们观察到Pd子系统的磁性特征。基于密度泛函理论的磁光不对称计算结果与实测结果非常吻合。在Ni吸收边缘处测量的飞秒自旋动力学表明，增加Pd浓度会导致居里温度T_C降低，从而导致退磁时间τ_M减少，这与单个物种的τ_M〜1 / T_C缩放相反材料。该观察结果归因于合金中Pd介导的自旋轨道耦合的增加。

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  • 来源
    《Physical review》 |2018年第6期|064412.1-064412.9|共9页
  • 作者

    Seung-gi Gang; Roman Adam; Moritz Ploetzing; Moritz von Witzleben; Christian Weier; Umut Parlak; Daniel E. Buergler; Claus M. Schneider; Jan Rusz; Pablo Maldonado; Peter M. Oppeneer;

  • 作者单位

    Peter Gruenberg Institut PGI-6, Research Centre Mich, 52425 Juelich, Germany;

    Peter Gruenberg Institut PGI-6, Research Centre Mich, 52425 Juelich, Germany;

    Peter Gruenberg Institut PGI-6, Research Centre Mich, 52425 Juelich, Germany;

    Peter Gruenberg Institut PGI-6, Research Centre Mich, 52425 Juelich, Germany;

    Peter Gruenberg Institut PGI-6, Research Centre Mich, 52425 Juelich, Germany;

    Peter Gruenberg Institut PGI-6, Research Centre Mich, 52425 Juelich, Germany;

    Peter Gruenberg Institut PGI-6, Research Centre Mich, 52425 Juelich, Germany;

    Peter Gruenberg Institut PGI-6, Research Centre Mich, 52425 Juelich, Germany;

    Department of Physics and Astronomy, Uppsala University, P.O. Box 516, 75120 Uppsala, Sweden;

    Department of Physics and Astronomy, Uppsala University, P.O. Box 516, 75120 Uppsala, Sweden;

    Department of Physics and Astronomy, Uppsala University, P.O. Box 516, 75120 Uppsala, Sweden;

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