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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Bolometers convert electromagnetic waves to DC voltage via temperature changes.
  • Superconducting bolometers offer high responsivity (~106-107 V/W) but require cryogenic temperatures and are limited in the sub-GHz range.
  • Developing room-temperature, high-responsivity detectors for sub-GHz frequencies is a significant challenge.

Purpose of the Study:

  • To demonstrate a novel spin bolometer capable of high responsivity in the sub-GHz frequency region at room temperature.
  • To investigate the mechanism behind the enhanced responsivity in the proposed device.
  • To explore the potential of spin-torque phenomena for advanced detector applications.

Main Methods:

  • Fabrication of a spin bolometer utilizing magnetic tunnel junctions.
  • Induction of auto-oscillation within the magnetic tunnel junctions to generate heat.
  • Measurement of the device's responsivity in the sub-GHz frequency range at room temperature.
  • Analysis of the heat-induced spin-torque mechanism and its effect on magnetization precession.

Main Results:

  • Achieved a responsivity of (4.40 ± 0.04) × 106 V/W in the sub-GHz region at room temperature.
  • Observed a significant heat-induced spin-torque due to a large heat-controlled magnetic anisotropy change (-2.7 µJ/m·W).
  • Demonstrated that heat-induced spin-torque synchronizes magnetization precession, leading to a substantial voltage output.

Conclusions:

  • The developed spin bolometer achieves unprecedented high responsivity in the sub-GHz range at room temperature.
  • Heat-induced spin-torque, driven by magnetic anisotropy changes, is the key mechanism for the enhanced performance.
  • This technology holds promise for the development of highly sensitive microwave detectors.