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Spin caloritronic nano-oscillator.

C Safranski1, I Barsukov2, H K Lee3

  • 1Department of Physics and Astronomy, University of California, Irvine, California, 92697, USA. csafrans@uci.edu.

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|July 27, 2017
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Summary
This summary is machine-generated.

Researchers harnessed ohmic heating in Y3Fe5O12/Pt nanowires to generate tunable microwave signals. This spin caloritronic approach utilizes pure spin current from thermal gradients, enabling new possibilities for nano-electronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Ohmic heating causes energy loss, limiting nano-electronic device performance.
  • Harvesting this heat for signal processing remains a significant challenge in electronics and spin caloritronics.

Purpose of the Study:

  • To demonstrate the utilization of thermal gradients from ohmic heating for generating tunable microwave signals.
  • To explore the potential of spin caloritronic devices for microwave and magnonic applications.

Main Methods:

  • Fabrication of Y3Fe5O12/Pt bilayer nanowires.
  • Utilizing ohmic heating in the Pt layer to induce a thermal gradient.
  • Observing the excitation of magnetization auto-oscillations via pure spin current injection.

Main Results:

  • Demonstrated the generation of coherent auto-oscillations of magnetization in Y3Fe5O12.
  • Observed the generation of tunable microwave signals driven by heat.
  • Confirmed the role of pure spin current in mediating the heat-driven dynamics.

Conclusions:

  • Ohmic heating can be effectively utilized to drive spin dynamics and generate microwave signals.
  • This work opens pathways for developing novel spin caloritronic devices for microwave and magnonic applications.
  • The Y3Fe5O12/Pt system shows promise for heat-assisted signal generation in nano-electronics.