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Anisotropic Absorption of Pure Spin Currents.

A A Baker1,2, A I Figueroa1, C J Love1,3

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Summary
This summary is machine-generated.

Researchers studied spin pumping in spin valves, finding that layer damping can control spin currents. This anisotropy is key for developing faster, low-power spintronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Spin transfer in magnetic multilayers is crucial for ultrafast, low-power electronic devices.
  • Spin pumping is a key phenomenon in spintronic devices, involving the transfer of spin angular momentum.

Purpose of the Study:

  • To investigate spin pumping in spin valves.
  • To demonstrate the induction of spin pumping anisotropy via angular dependence of Gilbert damping.
  • To explore mechanisms for enhanced spin torques and angular control in spintronic devices.

Main Methods:

  • Utilized lab- and synchrotron-based ferromagnetic resonance (FMR).
  • Studied spin valves with crystalline Co_{50}Fe_{50} as the source layer and polycrystalline Ni_{81}Fe_{19} as the spin sink layer.
  • Investigated the role of the spin diffusion length in Chromium (Cr).

Main Results:

  • Demonstrated that in-plane damping variations in the source layer induce anisotropic Gilbert damping (α) in the spin sink layer.
  • Determined the spin diffusion length in Cr to be 8 nm.
  • Showed that the observed anisotropy is suppressed above the spin diffusion length and is independent of static exchange coupling.

Conclusions:

  • Anisotropy in spin pumping can be effectively controlled by the angular dependence of Gilbert damping in the spin sink layer.
  • These findings provide insights into spin current transmission and absorption.
  • The study offers a pathway for realizing enhanced spin torques and angular control in next-generation spintronic devices.