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<p>Spin mixing conductance (SMC) determines spin angular momentum transfer across ferromagnet/nonmagnet (FM/NM) interfaces and directly controls spin pumping-induced damping. While SMC is well understood in bilayer systems, its quantitative behaviour in multilayers with multiple spin-sink interfaces remains unclear. Here, we report an all-optical study of spin pumping in a Ta/Co<sub>20</sub>Fe<sub>60</sub>B<sub>20</sub> (CoFeB)/W trilayer, where a single ferromagnetic CoFeB layer is coupled to two nonmagnetic spin sinks. Time-resolved magneto-optical Kerr effect measurements are used to extract the effective Gilbert damping and corresponding effective SMC, which are benchmarked against reference Ta/CoFeB and CoFeB/W bilayers. Although the damping enhancement in the trilayer is not strictly additive, the extracted composite effective SMC quantitatively follows a series-sum relation of the SMCs of the constituent interfaces. This result demonstrates that spin transport in the trilayer is governed by independent spin pumping contributions from each interface, establishing composite SMC as a useful metric for engineering damping in multilayer spintronic heterostructures.</p>

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All-optical quantification of composite spin mixing conductance in a dual spin sink magnetic trilayer

  • 期刊论文

  • 发表日期：

    2026年4月24日

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  • Sayanti Mondal,
  • Suchetana Mukhopadhyay,
  • Sayan Mathur,
  • Bikram Baghira,
  • Swapnil Barman,
  • Pratap Kumar Pal,
  • Anjan Barman

摘要

Spin mixing conductance (SMC) determines spin angular momentum transfer across ferromagnet/nonmagnet (FM/NM) interfaces and directly controls spin pumping-induced damping. While SMC is well understood in bilayer systems, its quantitative behaviour in multilayers with multiple spin-sink interfaces remains unclear. Here, we report an all-optical study of spin pumping in a Ta/Co20Fe60B20 (CoFeB)/W trilayer, where a single ferromagnetic CoFeB layer is coupled to two nonmagnetic spin sinks. Time-resolved magneto-optical Kerr effect measurements are used to extract the effective Gilbert damping and corresponding effective SMC, which are benchmarked against reference Ta/CoFeB and CoFeB/W bilayers. Although the damping enhancement in the trilayer is not strictly additive, the extracted composite effective SMC quantitatively follows a series-sum relation of the SMCs of the constituent interfaces. This result demonstrates that spin transport in the trilayer is governed by independent spin pumping contributions from each interface, establishing composite SMC as a useful metric for engineering damping in multilayer spintronic heterostructures.