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Interfacial magnetic anisotropy from a 3-dimensional Rashba substrate.

Junwen Li1, Paul M Haney2

  • 1Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA; Maryland NanoCenter, University of Maryland, College Park, MD 20742, USA.

Applied Physics Letters
|August 24, 2016
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We discovered interfacial magnetic anisotropy in ferromagnet/3-d Rashba material bilayers. This anisotropy, tunable with electric fields, offers a new route for electrical control of magnetic orientation.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Interfacial magnetic anisotropy is crucial for spintronic devices.
  • Rashba materials exhibit strong spin-orbit coupling, influencing magnetic properties.

Purpose of the Study:

  • Investigate interfacial magnetic anisotropy in ferromagnet/3-d Rashba material systems.
  • Explore the role of spin-orbit strength and symmetry breaking in determining anisotropy.
  • Propose a mechanism for electrical control of magnetism.

Main Methods:

  • Utilized a tight-binding model to simulate the ferromagnet/3-d Rashba bilayer.
  • Analyzed the effects of spin-orbit coupling strength (α) and the direction of broken inversion symmetry (n̂).
  • Evaluated anisotropy in a simplified 1-d model for scaling behavior.

Main Results:

  • Identified in-plane uniaxial magnetic anisotropy along the ẑ × n̂ direction.
  • Found anisotropy comparable to bulk magnetocrystalline anisotropy for realistic α values.
  • Demonstrated α⁴ scaling for in-plane easy axis anisotropy in a 1-d model.

Conclusions:

  • Interfacial magnetic anisotropy in these systems is significant and tunable.
  • The direction of anisotropy is dictated by the Rashba material's symmetry.
  • Electrical control of magnetic orientation is achievable via ferroelectric Rashba materials.