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Angular Momentum Transfer via Relativistic Spin-Lattice Coupling from First Principles.

Sergiy Mankovsky1, Svitlana Polesya1, Hannah Lange1

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We developed a first-principles method to calculate spin-lattice coupling parameters, revealing Dzyaloshiskii-Moriya interactions are key for angular momentum transfer between spin and lattice in materials like iron.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Angular momentum transfer is crucial for spintronic devices.
  • Recent advances enable spin-to-lattice angular momentum transfer on ultrashort timescales.

Purpose of the Study:

  • To understand spin-lattice angular momentum transfer.
  • To present a first-principles scheme for calculating relativistic spin-lattice coupling parameters.

Main Methods:

  • Developed a scheme for fully relativistic spin-lattice coupling parameter calculation.
  • Treated spin configuration and atomic position changes coherently.
  • Derived closed-form expressions for atomic spin-lattice coupling parameters.

Main Results:

  • Calculated spin-lattice coupling parameters, including spin-orbit coupling effects.
  • Identified Dzyaloshiskii-Moriya interactions as the leading term for angular momentum exchange.
  • Demonstrated this interaction in body-centered cubic (bcc) iron due to lattice distortion.

Conclusions:

  • The new method provides insights into spin-lattice dynamics.
  • Spin-orbit coupling and lattice symmetry breaking are critical for angular momentum transfer.
  • Dzyaloshiskii-Moriya interactions play a significant role in spin-lattice coupling.