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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • The spin Hall effect in heavy metals generates spin currents from charge currents.
  • Spin-orbit torque (SOT) is widely used to manipulate magnetization in metallic ferromagnets.
  • Controlling magnetization in magnetic insulators (MIs) via currents has been challenging due to the absence of charge current flow.

Purpose of the Study:

  • To demonstrate current-induced magnetization switching in a magnetic insulator.
  • To investigate the feasibility of using spin currents for magnetization control in MIs.
  • To pave the way for ultralow-dissipation spintronic devices based on MIs.

Main Methods:

  • Utilizing a platinum (Pt) overlayer to generate spin current via the spin Hall effect.
  • Employing spin-current injection into a perpendicularly magnetized thulium iron garnet (Tm3Fe5O12) film.
  • Characterizing spin-mixing conductance and damping-like SOT using spin Hall magnetoresistance and harmonic Hall measurements.

Main Results:

  • Demonstrated deterministic magnetization reversal in a magnetic insulator at low current densities.
  • Estimated significant spin-mixing conductance and damping-like SOT.
  • Indicated substantial spin transparency at the Pt/MI interface.

Conclusions:

  • Spin currents can effectively switch magnetization in magnetic insulators.
  • The Pt/Tm3Fe5O12 interface exhibits considerable spin transparency.
  • This work opens avenues for developing energy-efficient spintronic devices utilizing magnetic insulators.