• DOI:10.1002/adom.202100412
• Corpus ID: 232257697

Spin Injection Efficiency at Metallic Interfaces Probed by THz Emission Spectroscopy

@article{Hawecker2021SpinIE,
  title={Spin Injection Efficiency at Metallic Interfaces Probed by THz Emission Spectroscopy},
  author={Jacques Hawecker and Thi Huong Dang and E. Rongione and James Boust and Sophie Collin and J. M. George and Henri-Jean Drouhin and Yannis Laplace and Romain Grasset and Jingwei Dong and Juliette Mangeney and Jerome Tignon and Henri Jaffr{\`e}s and Luca Perfetti and Sukhdeep S. Dhillon},
  journal={Advanced Optical Materials},
  year={2021},
  volume={9}
}

• J. Hawecker, T. Dang, +12 authors S. Dhillon
• Published 17 March 2021
• Physics
• Advanced Optical Materials

Terahertz (THz) spin‐to‐charge conversion has become an increasingly important process for THz pulse generation and as a tool to probe ultrafast spin interactions at magnetic interfaces. However, its relation to traditional, steady state, ferromagnetic resonance techniques is poorly understood. Here, nanometric trilayers of Co/X/Pt (X = Ti, Au or an Au:W alloy) are investigated as a function of the “X” layer thickness, where THz emission generated by the inverse spin Hall effect is compared to the Gilbert damping of the ferromagnetic resonance. Through the insertion of the “X” layer it is shown that the ultrafast spin current injected in the non‐magnetic layer defines a direct‐spin‐conductance, whereas the Gilbert damping leads to an effective spin‐mixing‐conductance of the trilayer. Importantly, it is shown that these two parameters are connected to each other and that spin‐memory‐losses can be modeled via an effective Hamiltonian with Rashba fields. This work highlights that magneto‐circuit concepts can be successfully extended to ultrafast spintronic devices, as well as enhancing the understanding of spin‐to‐charge conversion processes through the complementarity between ultrafast THz spectroscopy and steady state techniques.