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Disorder Dependence of Interface Spin Memory Loss.

Kriti Gupta1, Rien J H Wesselink1, Ruixi Liu2

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Spin memory loss (SML) at interfaces is studied using first-principles theory. Nonmagnetic interfaces show minimal temperature dependence, while ferromagnet interfaces exhibit strong dependence due to spin disorder.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Spin-orbit coupling causes spin-current discontinuity at interfaces, quantified by the spin memory loss (SML) parameter.
  • Understanding SML is crucial for spintronic device efficiency and novel quantum phenomena.

Purpose of the Study:

  • To investigate the spin memory loss (SML) at various metal interfaces, including Au|Pt, Au|Pd, Py|Pt, and Co|Pt.
  • To determine the influence of temperature, interface abruptness, alloying, and lattice mismatch on SML.
  • To assess the impact of proximity-induced magnetization on SML.

Main Methods:

  • Utilizing first-principles scattering theory.
  • Employing a recently developed local current scheme for accurate SML calculations.
  • Analyzing interfaces with varying compositions and structures (Au|Pt, Au|Pd, Py|Pt, Co|Pt).

Main Results:

  • Nonmagnetic interfaces (Au|Pt, Au|Pd) exhibit minimal temperature dependence of SML.
  • Interfaces with ferromagnets (Py|Pt, Co|Pt) show strong temperature dependence attributed to spin disorder.
  • SML is significantly enhanced by lattice mismatch and interface alloying.
  • Co|Pt interfaces display larger SML than Py|Pt due to greater abruptness.
  • Proximity-induced magnetization in Pt has a negligible effect on SML.

Conclusions:

  • Interface characteristics like abruptness, alloying, and lattice mismatch are key determinants of SML.
  • Spin disorder in ferromagnets plays a critical role in temperature-dependent SML.
  • The findings provide insights for designing efficient spintronic interfaces.