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Controlling All-Optical Helicity-Dependent Switching in Engineered Rare-Earth Free Synthetic Ferrimagnets.

Jung-Wei Liao1, Pierre Vallobra2, Liam O'Brien3

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Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 25, 2019
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Rare-earth free synthetic ferrimagnets enable all-optical switching controlled by light and Curie temperature. This opto-spintronic advance offers new ways to manipulate magnetic configurations.

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Area of Science:

  • Spintronics
  • Optics
  • Materials Science

Background:

  • All-optical switching in ferromagnetic materials offers a route to manipulate magnetic configurations using circularly polarized laser pulses.
  • Synthetic ferrimagnetic heterostructures provide a platform for advanced magnetic control.

Purpose of the Study:

  • To investigate rare-earth free synthetic ferrimagnetic heterostructures for all-optical switching.
  • To explore the control mechanisms of light helicity and Curie temperature on magnetic switching.

Main Methods:

  • Fabrication of rare-earth free synthetic ferrimagnetic heterostructures.
  • Experimental investigation of all-optical switching using femtosecond laser pulses.
  • Numerical simulations to support experimental findings.

Main Results:

  • Demonstration of all-optical switching controlled by light helicity and relative Curie temperatures of ferromagnetic layers.
  • Antiferromagnetic exchange coupling dictates magnetic orientation based on Curie temperature.
  • Helicity-independent switching observed for similar Curie temperatures, dependent on initial magnetic state.

Conclusions:

  • Engineered rare-earth free heterostructures enable novel all-optical switching.
  • Opto-spintronic control is achievable through light helicity and tailored Curie temperatures.
  • This research opens avenues for practical opto-spintronic applications.