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Self-current induced spin-orbit torque in FeMn/Pt multilayers.

Yanjun Xu1,2, Yumeng Yang1,3, Kui Yao3

  • 1Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore.

Scientific Reports
|May 18, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed FeMn/Pt multilayers for enhanced spin-orbit torque, enabling efficient magnetization switching without thickness constraints or heavy metal layers. This breakthrough advances spintronic device applications.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Spin-orbit torque (SOT) in ferromagnetic metal/heavy metal bilayers is crucial for magnetization switching.
  • SOT efficiency is inversely proportional to ferromagnetic layer thickness, limiting applications.

Purpose of the Study:

  • To investigate FeMn/Pt multilayers for current-induced spin-orbit torque without ferromagnetic layer thickness constraints.
  • To explore the potential of these multilayers for efficient magnetization switching.

Main Methods:

  • Fabrication of ultrathin Pt and FeMn alternating multilayers.
  • Characterization of ferromagnetic properties and critical behavior.
  • Measurement of current-induced spin-orbit torque and effective field.

Main Results:

  • FeMn/Pt multilayers exhibit ferromagnetic properties and significant current-induced SOT.
  • Critical behavior aligns with the 3D Heisenberg model with a Curie temperature distribution.
  • The spin torque effective field is approximately 4 times larger than in NiFe/Pt bilayers for equivalent NiFe thickness.
  • Reversible magnetization switching achieved via self-current-generated SOT, independent of external fields or thick heavy metal layers.

Conclusions:

  • FeMn/Pt multilayers overcome the thickness limitations of traditional SOT devices.
  • This approach enables efficient magnetization switching without requiring adjacent heavy metal layers.
  • The findings open new avenues for practical spintronic applications utilizing spin-orbit torque.