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Variable spin-charge conversion across metal-insulator transition.

Taqiyyah S Safi1, Pengxiang Zhang1, Yabin Fan1

  • 1Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.

Nature Communications
|January 26, 2020
PubMed
Summary
This summary is machine-generated.

Charge-to-spin conversion efficiency in vanadium dioxide (VO2) was modulated by its metal-insulator transition. This transition significantly altered spin pumping signals and conversion efficiency, offering insights into correlated electron physics.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Charge-to-spin conversion efficiency is vital for spintronic devices.
  • This efficiency is typically fixed by material properties, limiting tunability.
  • Strongly correlated electron systems offer unique physical phenomena.

Purpose of the Study:

  • To investigate the modulation of charge-to-spin conversion efficiency.
  • To explore the role of the metal-insulator transition in this modulation.
  • To understand spin-related physics in vanadium dioxide (VO2) during phase transition.

Main Methods:

  • Utilized ferromagnetic resonance (FMR) driven spin pumping.
  • Employed inverse spin Hall effect (ISHE) measurements.
  • Investigated the metal-insulator transition in vanadium dioxide (VO2).

Main Results:

  • Observed a significant decrease (>80%) in the spin pumping signal.
  • Found a substantial increase (five times) in charge-spin conversion efficiency.
  • Correlated the observed changes with the insulator-to-metal transition in VO2.

Conclusions:

  • The metal-insulator transition in VO2 provides a pathway to modulate charge-to-spin conversion efficiency.
  • Abrupt changes in structural and electrical properties influence spin physics.
  • This study offers insights into spin-related phenomena in phase-transition materials.