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Optical damage limit of efficient spintronic THz emitters.

Sandeep Kumar1, Anand Nivedan1, Arvind Singh1

  • 1Femtosecond Spectroscopy and Nonlinear Photonics Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India.

Iscience
|October 14, 2021
PubMed
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Spintronic heterostructures generate terahertz (THz) pulses efficiently. The Fe/Ta combination shows a high damage threshold, crucial for powerful THz emitters.

Area of Science:

  • Terahertz (THz) science and technology
  • Spintronics
  • Optoelectronics

Background:

  • Terahertz (THz) pulses are generated using femtosecond laser excitation of ferromagnetic/nonmagnetic spintronic heterostructures via the inverse spin Hall effect.
  • The THz signal strength is fundamentally limited by the optical damage threshold of these heterostructures.

Purpose of the Study:

  • To optimize spintronic heterostructures for efficient THz generation.
  • To investigate the relationship between material composition, optical damage threshold, and THz generation efficiency.

Main Methods:

  • Fabrication and characterization of various bilayer (Fe, CoFeB)/(Pt, Ta) spintronic heterostructures.
  • Optical pumping experiments using sub-50 fs amplified laser pulses at 800 nm.
  • Measurement of THz signal strength and determination of optical damage thresholds.
Keywords:
EngineeringPhotonicsPhysics

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Main Results:

  • CoFeB/Pt demonstrated the highest THz generation efficiency among the studied combinations.
  • Optimized heterostructures with an alpha-phase Ta nonmagnetic layer exhibited the highest optical damage threshold compared to Pt.
  • The Fe/Ta heterostructure showed a damage threshold of approximately 85 GW/cm^2 on a quartz substrate.
  • THz generation efficiency did not saturate with excitation fluence up to the damage threshold for thickness-optimized structures.

Conclusions:

  • Spintronic heterostructures, particularly CoFeB/Pt, are promising for efficient THz sources.
  • Incorporating alpha-phase Ta enhances the optical damage threshold of spintronic THz emitters, enabling higher THz output.
  • Further optimization of spintronic heterostructures is key to overcoming current limitations in THz generation.