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Spin Dynamics across Metallic Layers on the Few-Femtosecond Timescale.

Romain Géneaux1,2,3, Hung-Tzu Chang1, Alexander Guggenmos1

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We observed ultrafast spin injection in cobalt-platinum layers using attosecond magnetic circular dichroism. This light-driven spin current, lasting under 5 femtoseconds, offers new ways to control spin dynamics in materials.

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Area of Science:

  • Condensed Matter Physics
  • Ultrafast Magnetism
  • Attosecond Science

Background:

  • Understanding light-matter interactions at the atomic scale is crucial for developing next-generation electronic devices.
  • Magnetic multilayer structures offer tunable properties for spintronic applications.
  • Controlling magnetization dynamics with light requires probing ultrafast processes.

Purpose of the Study:

  • To investigate the light-driven magnetic response of cobalt-platinum multilayer structures on the few-femtosecond timescale.
  • To elucidate the mechanism of ultrafast spin rearrangement induced by light excitation.
  • To explore the potential for light-field shaping to control spin currents.

Main Methods:

  • Attosecond magnetic circular dichroism (AMCD) spectroscopy to probe magnetization dynamics.
  • Fabrication of thin alternating cobalt-platinum multilayer structures.
  • Time-dependent density functional theory (TD-DFT) for theoretical interpretation.

Main Results:

  • Observed a sub-5 femtosecond (fs) spike in magnetization within the platinum layer, mirroring the driving light pulse.
  • Demonstrated light-driven spin injection across the metallic layers.
  • Showcased a light-triggered spin current that significantly outpaces decoherence and dephasing times.

Conclusions:

  • Ultrafast spin injection is achievable in cobalt-platinum multilayers with precise light control.
  • The short-lived nature of the spin current highlights the potential for novel spintronic functionalities.
  • Tailoring light fields offers a pathway to engineer and control spin currents in materials.