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Picosecond Spin Seebeck Effect.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • The spin Seebeck effect (SSE) is a key phenomenon in spintronics for generating spin currents from thermal gradients.
  • Understanding the dynamics of SSE at interfaces is crucial for developing efficient spin-based devices.
  • Distinguishing interfacial effects from bulk contributions in SSE measurements is challenging.

Purpose of the Study:

  • To investigate the time-resolved longitudinal spin Seebeck effect (SSE) in normal metal/yttrium iron garnet (Y3Fe5O12) bilayers.
  • To determine the timescale of spin accumulation and angular momentum transfer across the interface.
  • To quantify the interfacial spin-mixing conductance and SSE coefficient.

Main Methods:

  • Time-resolved magneto-optic Kerr effect (MOKE) measurements.
  • Utilizing laser excitation to induce an interfacial temperature difference between electrons and magnons.
  • Analyzing the time evolution of spin accumulation dynamics.

Main Results:

  • Observed picosecond-scale angular momentum transfer across normal metal/Y3Fe5O12 interfaces.
  • Demonstrated that the observed spin transfer is too fast for bulk temperature gradient contributions in Y3Fe5O12.
  • Determined the product of spin-mixing conductance and interfacial SSE coefficient to be approximately 10^8 A m^-2 K^-1.

Conclusions:

  • The interfacial electron-magnon temperature difference is the primary driver of the longitudinal SSE in these bilayers.
  • Spin accumulation and angular momentum transfer occur on ultrafast (picosecond) timescales at the interface.
  • The results provide crucial insights into the interfacial physics governing spin-to-charge conversion in magnetic heterostructures.